/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_label31.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-27 19:26:51,999 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-27 19:26:52,002 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-27 19:26:52,058 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-27 19:26:52,059 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-27 19:26:52,067 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-27 19:26:52,070 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-27 19:26:52,075 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-27 19:26:52,079 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-27 19:26:52,086 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-27 19:26:52,088 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-27 19:26:52,090 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-27 19:26:52,090 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-27 19:26:52,095 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-27 19:26:52,099 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-27 19:26:52,102 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-27 19:26:52,103 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-27 19:26:52,107 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-27 19:26:52,115 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-27 19:26:52,123 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-27 19:26:52,125 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-27 19:26:52,127 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-27 19:26:52,129 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-27 19:26:52,132 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-27 19:26:52,141 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-27 19:26:52,141 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-27 19:26:52,142 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-27 19:26:52,150 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-27 19:26:52,151 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-27 19:26:52,155 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-27 19:26:52,155 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-27 19:26:52,156 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-27 19:26:52,157 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-27 19:26:52,158 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-27 19:26:52,159 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-27 19:26:52,159 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-27 19:26:52,160 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-27 19:26:52,160 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-27 19:26:52,160 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-27 19:26:52,161 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-27 19:26:52,162 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-27 19:26:52,164 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 19:26:52,193 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-27 19:26:52,193 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-27 19:26:52,195 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-27 19:26:52,195 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-27 19:26:52,195 INFO L138 SettingsManager]: * Use SBE=true [2020-10-27 19:26:52,196 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-27 19:26:52,196 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-27 19:26:52,196 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-27 19:26:52,196 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-27 19:26:52,196 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-27 19:26:52,196 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-27 19:26:52,197 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-27 19:26:52,197 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-27 19:26:52,197 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-27 19:26:52,197 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-27 19:26:52,197 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-27 19:26:52,198 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-27 19:26:52,198 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-27 19:26:52,198 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-27 19:26:52,198 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-27 19:26:52,198 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-27 19:26:52,199 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 19:26:52,199 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-27 19:26:52,199 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-27 19:26:52,199 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-27 19:26:52,200 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-27 19:26:52,200 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-27 19:26:52,200 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-27 19:26:52,200 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-27 19:26:52,200 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true;unknown-allowed=true; [2020-10-27 19:26:52,602 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-27 19:26:52,656 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-27 19:26:52,659 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-27 19:26:52,661 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-27 19:26:52,662 INFO L275 PluginConnector]: CDTParser initialized [2020-10-27 19:26:52,663 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem19_label31.c [2020-10-27 19:26:52,752 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e899c987d/4b6a5866bb564ddf81e89227a7930bc3/FLAG5405003f5 [2020-10-27 19:26:54,183 INFO L306 CDTParser]: Found 1 translation units. [2020-10-27 19:26:54,184 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem19_label31.c [2020-10-27 19:26:54,251 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e899c987d/4b6a5866bb564ddf81e89227a7930bc3/FLAG5405003f5 [2020-10-27 19:26:54,371 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e899c987d/4b6a5866bb564ddf81e89227a7930bc3 [2020-10-27 19:26:54,375 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-27 19:26:54,415 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-27 19:26:54,428 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-27 19:26:54,428 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-27 19:26:54,434 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-27 19:26:54,434 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:26:54" (1/1) ... [2020-10-27 19:26:54,438 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a5d40e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:54, skipping insertion in model container [2020-10-27 19:26:54,438 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:26:54" (1/1) ... [2020-10-27 19:26:54,448 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-27 19:26:54,662 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-27 19:26:57,093 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:26:57,118 INFO L203 MainTranslator]: Completed pre-run [2020-10-27 19:26:58,375 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:26:58,448 INFO L208 MainTranslator]: Completed translation [2020-10-27 19:26:58,449 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58 WrapperNode [2020-10-27 19:26:58,450 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-27 19:26:58,451 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-27 19:26:58,452 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-27 19:26:58,452 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-27 19:26:58,471 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58" (1/1) ... [2020-10-27 19:26:58,474 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58" (1/1) ... [2020-10-27 19:26:58,635 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58" (1/1) ... [2020-10-27 19:26:58,635 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58" (1/1) ... [2020-10-27 19:26:58,815 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58" (1/1) ... [2020-10-27 19:26:58,964 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58" (1/1) ... [2020-10-27 19:26:59,022 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58" (1/1) ... [2020-10-27 19:26:59,093 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-27 19:26:59,095 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-27 19:26:59,096 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-27 19:26:59,096 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-27 19:26:59,097 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58" (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 19:26:59,260 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-27 19:26:59,261 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-27 19:26:59,261 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-27 19:26:59,262 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-27 19:26:59,262 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-27 19:26:59,262 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-27 19:26:59,263 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-27 19:26:59,264 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2020-10-27 19:26:59,264 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2020-10-27 19:26:59,264 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-27 19:26:59,265 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-27 19:26:59,265 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-27 19:26:59,265 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-27 19:26:59,266 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-27 19:26:59,266 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2020-10-27 19:26:59,267 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2020-10-27 19:26:59,267 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-27 19:26:59,268 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-27 19:26:59,268 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-27 19:26:59,268 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-27 19:26:59,268 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-27 19:26:59,268 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-27 19:26:59,268 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-27 19:26:59,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-27 19:26:59,269 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-27 19:26:59,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-27 19:26:59,269 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-27 19:26:59,269 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-27 19:26:59,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-27 19:27:18,504 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-27 19:27:18,505 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-27 19:27:18,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:27:18 BoogieIcfgContainer [2020-10-27 19:27:18,511 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-27 19:27:18,516 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-27 19:27:18,516 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-27 19:27:18,524 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-27 19:27:18,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 07:26:54" (1/3) ... [2020-10-27 19:27:18,525 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c91a9e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:27:18, skipping insertion in model container [2020-10-27 19:27:18,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:26:58" (2/3) ... [2020-10-27 19:27:18,526 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c91a9e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:27:18, skipping insertion in model container [2020-10-27 19:27:18,526 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:27:18" (3/3) ... [2020-10-27 19:27:18,528 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem19_label31.c [2020-10-27 19:27:18,543 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-27 19:27:18,551 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-27 19:27:18,567 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-27 19:27:18,630 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-27 19:27:18,630 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-27 19:27:18,630 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-27 19:27:18,630 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-27 19:27:18,631 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-27 19:27:18,631 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-27 19:27:18,631 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-27 19:27:18,631 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-27 19:27:18,694 INFO L276 IsEmpty]: Start isEmpty. Operand 1781 states. [2020-10-27 19:27:18,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-27 19:27:18,701 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:27:18,702 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] [2020-10-27 19:27:18,703 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:27:18,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:27:18,710 INFO L82 PathProgramCache]: Analyzing trace with hash 177362654, now seen corresponding path program 1 times [2020-10-27 19:27:18,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:27:18,722 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754770497] [2020-10-27 19:27:18,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:27:18,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:27:19,004 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:27:19,448 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:27:19,449 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-10-27 19:27:19,450 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:27:19,451 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 542 [2020-10-27 19:27:19,454 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:27:19,454 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 19:27:19,455 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 19:27:19,455 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 26 [2020-10-27 19:27:19,455 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-10-27 19:27:19,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:27:19,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:27:19,664 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:27:19,693 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:27:19,694 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:27:19,694 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:27:19,694 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 38 [2020-10-27 19:27:19,694 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:27:19,695 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:27:19,695 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:27:19,695 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 19:27:19,695 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:27:19,722 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 19:27:19,723 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754770497] [2020-10-27 19:27:19,725 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:27:19,725 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-27 19:27:19,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529795089] [2020-10-27 19:27:19,732 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-27 19:27:19,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:27:19,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-27 19:27:19,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-27 19:27:19,758 INFO L87 Difference]: Start difference. First operand 1781 states. Second operand 4 states. [2020-10-27 19:27:52,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:27:52,615 INFO L93 Difference]: Finished difference Result 5117 states and 9608 transitions. [2020-10-27 19:27:52,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:27:52,619 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2020-10-27 19:27:52,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:27:52,671 INFO L225 Difference]: With dead ends: 5117 [2020-10-27 19:27:52,672 INFO L226 Difference]: Without dead ends: 3272 [2020-10-27 19:27:52,685 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 19:27:52,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3272 states. [2020-10-27 19:27:52,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3272 to 3201. [2020-10-27 19:27:52,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3201 states. [2020-10-27 19:27:52,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3201 states to 3201 states and 5485 transitions. [2020-10-27 19:27:52,918 INFO L78 Accepts]: Start accepts. Automaton has 3201 states and 5485 transitions. Word has length 25 [2020-10-27 19:27:52,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:27:52,919 INFO L481 AbstractCegarLoop]: Abstraction has 3201 states and 5485 transitions. [2020-10-27 19:27:52,919 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-27 19:27:52,919 INFO L276 IsEmpty]: Start isEmpty. Operand 3201 states and 5485 transitions. [2020-10-27 19:27:52,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-10-27 19:27:52,924 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:27:52,924 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-10-27 19:27:52,925 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-27 19:27:52,925 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:27:52,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:27:52,926 INFO L82 PathProgramCache]: Analyzing trace with hash -48407943, now seen corresponding path program 1 times [2020-10-27 19:27:52,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:27:52,926 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459152164] [2020-10-27 19:27:52,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:27:52,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:27:53,028 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:27:53,475 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:27:54,407 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:27:54,408 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 109 [2020-10-27 19:27:54,408 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 19:27:54,408 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1410 [2020-10-27 19:27:54,410 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:27:54,411 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:27:54,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 82 [2020-10-27 19:27:54,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-27 19:27:54,415 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-10-27 19:27:54,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:27:54,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:27:54,584 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:27:54,590 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:27:54,592 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:27:54,592 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:27:54,592 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-10-27 19:27:54,592 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:27:54,597 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:27:54,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:27:54,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:27:54,598 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-10-27 19:27:54,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:27:54,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:27:54,670 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:27:54,750 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:27:54,750 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 73 [2020-10-27 19:27:54,750 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:27:54,751 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 93 [2020-10-27 19:27:54,751 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:27:54,751 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:27:54,751 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:27:54,751 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 67 [2020-10-27 19:27:54,751 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:27:54,799 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:27:54,800 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459152164] [2020-10-27 19:27:54,800 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:27:54,800 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:27:54,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599692946] [2020-10-27 19:27:54,803 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:27:54,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:27:54,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:27:54,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:27:54,806 INFO L87 Difference]: Start difference. First operand 3201 states and 5485 transitions. Second operand 5 states. [2020-10-27 19:28:39,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:28:39,733 INFO L93 Difference]: Finished difference Result 7908 states and 13889 transitions. [2020-10-27 19:28:39,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:28:39,736 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 97 [2020-10-27 19:28:39,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:28:39,766 INFO L225 Difference]: With dead ends: 7908 [2020-10-27 19:28:39,766 INFO L226 Difference]: Without dead ends: 4713 [2020-10-27 19:28:39,776 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 19:28:39,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4713 states. [2020-10-27 19:28:39,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4713 to 4653. [2020-10-27 19:28:39,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4653 states. [2020-10-27 19:28:39,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4653 states to 4653 states and 7683 transitions. [2020-10-27 19:28:39,967 INFO L78 Accepts]: Start accepts. Automaton has 4653 states and 7683 transitions. Word has length 97 [2020-10-27 19:28:39,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:28:39,969 INFO L481 AbstractCegarLoop]: Abstraction has 4653 states and 7683 transitions. [2020-10-27 19:28:39,969 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:28:39,969 INFO L276 IsEmpty]: Start isEmpty. Operand 4653 states and 7683 transitions. [2020-10-27 19:28:39,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-10-27 19:28:39,983 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:28:39,984 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 19:28:39,984 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-27 19:28:39,985 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:28:39,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:28:39,987 INFO L82 PathProgramCache]: Analyzing trace with hash -1393468924, now seen corresponding path program 1 times [2020-10-27 19:28:39,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:28:39,988 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1723704841] [2020-10-27 19:28:39,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:28:40,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:28:40,116 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:40,549 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:41,412 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:28:41,413 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 136 [2020-10-27 19:28:41,413 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 19:28:41,413 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1326 [2020-10-27 19:28:41,413 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:28:41,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:28:41,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 109 [2020-10-27 19:28:41,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-27 19:28:41,415 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:28:41,588 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:28:41,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:28:41,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:28:41,595 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:41,601 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:28:41,601 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:28:41,602 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:28:41,602 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-27 19:28:41,602 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:28:41,602 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:28:41,603 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:28:41,603 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:28:41,603 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:28:41,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:28:41,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:28:41,694 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:41,786 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:28:41,787 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 100 [2020-10-27 19:28:41,787 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:28:41,787 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 112 [2020-10-27 19:28:41,787 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:28:41,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:28:41,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:28:41,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 94 [2020-10-27 19:28:41,788 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:28:41,877 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:28:41,878 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1723704841] [2020-10-27 19:28:41,878 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:28:41,878 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:28:41,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166484781] [2020-10-27 19:28:41,879 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:28:41,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:28:41,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:28:41,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:28:41,882 INFO L87 Difference]: Start difference. First operand 4653 states and 7683 transitions. Second operand 5 states. [2020-10-27 19:28:42,423 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-10-27 19:29:36,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:29:36,664 INFO L93 Difference]: Finished difference Result 13552 states and 22698 transitions. [2020-10-27 19:29:36,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:29:36,667 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 124 [2020-10-27 19:29:36,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:29:36,712 INFO L225 Difference]: With dead ends: 13552 [2020-10-27 19:29:36,713 INFO L226 Difference]: Without dead ends: 8905 [2020-10-27 19:29:36,727 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 1 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 19:29:36,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8905 states. [2020-10-27 19:29:36,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8905 to 8896. [2020-10-27 19:29:36,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8896 states. [2020-10-27 19:29:36,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8896 states to 8896 states and 14098 transitions. [2020-10-27 19:29:36,983 INFO L78 Accepts]: Start accepts. Automaton has 8896 states and 14098 transitions. Word has length 124 [2020-10-27 19:29:36,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:29:36,984 INFO L481 AbstractCegarLoop]: Abstraction has 8896 states and 14098 transitions. [2020-10-27 19:29:36,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:29:36,984 INFO L276 IsEmpty]: Start isEmpty. Operand 8896 states and 14098 transitions. [2020-10-27 19:29:36,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-10-27 19:29:36,986 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:29:36,987 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 19:29:36,987 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-27 19:29:36,987 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:29:36,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:29:36,988 INFO L82 PathProgramCache]: Analyzing trace with hash -610069912, now seen corresponding path program 1 times [2020-10-27 19:29:36,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:29:36,988 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091829826] [2020-10-27 19:29:36,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:29:37,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:29:37,059 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:29:37,378 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:29:37,613 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:29:38,332 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:29:38,333 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 138 [2020-10-27 19:29:38,333 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:29:38,333 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1299 [2020-10-27 19:29:38,333 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:29:38,334 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:29:38,334 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 111 [2020-10-27 19:29:38,334 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-27 19:29:38,334 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:29:38,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:29:38,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:29:38,505 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:29:38,518 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:29:38,518 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:29:38,519 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:29:38,519 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 16 [2020-10-27 19:29:38,519 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:29:38,519 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:29:38,519 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:29:38,520 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:29:38,520 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:29:38,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:29:38,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:29:38,601 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:29:38,720 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:29:38,721 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-27 19:29:38,721 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:29:38,721 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 135 [2020-10-27 19:29:38,722 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:29:38,723 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:29:38,723 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:29:38,724 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 96 [2020-10-27 19:29:38,724 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-27 19:29:38,827 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:29:38,828 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091829826] [2020-10-27 19:29:38,828 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:29:38,828 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-27 19:29:38,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024607122] [2020-10-27 19:29:38,830 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 19:29:38,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:29:38,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 19:29:38,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:29:38,836 INFO L87 Difference]: Start difference. First operand 8896 states and 14098 transitions. Second operand 6 states. [2020-10-27 19:29:38,994 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-10-27 19:30:50,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:30:50,104 INFO L93 Difference]: Finished difference Result 34688 states and 56935 transitions. [2020-10-27 19:30:50,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-27 19:30:50,107 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 126 [2020-10-27 19:30:50,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:30:50,222 INFO L225 Difference]: With dead ends: 34688 [2020-10-27 19:30:50,222 INFO L226 Difference]: Without dead ends: 25798 [2020-10-27 19:30:50,255 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-27 19:30:50,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25798 states. [2020-10-27 19:30:51,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25798 to 25778. [2020-10-27 19:30:51,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25778 states. [2020-10-27 19:30:51,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25778 states to 25778 states and 37522 transitions. [2020-10-27 19:30:51,158 INFO L78 Accepts]: Start accepts. Automaton has 25778 states and 37522 transitions. Word has length 126 [2020-10-27 19:30:51,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:30:51,158 INFO L481 AbstractCegarLoop]: Abstraction has 25778 states and 37522 transitions. [2020-10-27 19:30:51,158 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 19:30:51,159 INFO L276 IsEmpty]: Start isEmpty. Operand 25778 states and 37522 transitions. [2020-10-27 19:30:51,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2020-10-27 19:30:51,162 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:30:51,163 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 19:30:51,163 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-27 19:30:51,163 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:30:51,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:30:51,164 INFO L82 PathProgramCache]: Analyzing trace with hash -408159350, now seen corresponding path program 1 times [2020-10-27 19:30:51,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:30:51,165 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1740116215] [2020-10-27 19:30:51,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:30:51,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:30:51,242 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:30:51,517 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:30:52,252 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:30:52,253 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 171 [2020-10-27 19:30:52,253 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 19:30:52,253 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1042 [2020-10-27 19:30:52,253 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:30:52,253 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:30:52,254 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 144 [2020-10-27 19:30:52,254 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-27 19:30:52,254 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:30:52,484 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:30:52,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:30:52,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:30:52,493 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:30:52,500 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:30:52,501 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:30:52,501 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:30:52,501 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-10-27 19:30:52,501 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:30:52,501 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:30:52,501 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:30:52,502 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:30:52,502 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:30:52,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:30:52,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:30:52,614 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:30:52,739 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:30:52,739 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 135 [2020-10-27 19:30:52,739 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:30:52,739 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 149 [2020-10-27 19:30:52,740 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:30:52,740 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:30:52,740 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:30:52,740 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 129 [2020-10-27 19:30:52,740 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:30:52,896 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:30:52,897 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1740116215] [2020-10-27 19:30:52,897 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:30:52,897 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:30:52,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788578626] [2020-10-27 19:30:52,898 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:30:52,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:30:52,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:30:52,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:30:52,899 INFO L87 Difference]: Start difference. First operand 25778 states and 37522 transitions. Second operand 5 states. [2020-10-27 19:30:53,093 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 68