/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=SHALLOWEST --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/Problem13_label42.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-26 23:14:27,370 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-26 23:14:27,376 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-26 23:14:27,415 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-26 23:14:27,415 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-26 23:14:27,417 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-26 23:14:27,419 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-26 23:14:27,422 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-26 23:14:27,424 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-26 23:14:27,425 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-26 23:14:27,427 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-26 23:14:27,429 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-26 23:14:27,430 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-26 23:14:27,431 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-26 23:14:27,433 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-26 23:14:27,435 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-26 23:14:27,436 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-26 23:14:27,437 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-26 23:14:27,455 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-26 23:14:27,460 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-26 23:14:27,464 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-26 23:14:27,467 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-26 23:14:27,469 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-26 23:14:27,470 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-26 23:14:27,473 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-26 23:14:27,474 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-26 23:14:27,474 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-26 23:14:27,476 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-26 23:14:27,476 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-26 23:14:27,478 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-26 23:14:27,478 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-26 23:14:27,479 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-26 23:14:27,480 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-26 23:14:27,482 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-26 23:14:27,483 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-26 23:14:27,483 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-26 23:14:27,484 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-26 23:14:27,485 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-26 23:14:27,485 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-26 23:14:27,486 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-26 23:14:27,487 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-26 23:14:27,489 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 [2020-10-26 23:14:27,518 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-26 23:14:27,518 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-26 23:14:27,520 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-26 23:14:27,520 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-26 23:14:27,521 INFO L138 SettingsManager]: * Use SBE=true [2020-10-26 23:14:27,521 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-26 23:14:27,521 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-26 23:14:27,521 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-26 23:14:27,522 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-26 23:14:27,522 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-26 23:14:27,522 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-26 23:14:27,522 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-26 23:14:27,522 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-26 23:14:27,523 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-26 23:14:27,523 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-26 23:14:27,523 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-26 23:14:27,523 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-26 23:14:27,524 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-26 23:14:27,524 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-26 23:14:27,524 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-26 23:14:27,524 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-26 23:14:27,524 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-26 23:14:27,525 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-26 23:14:27,525 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-26 23:14:27,525 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-26 23:14:27,525 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-26 23:14:27,526 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-26 23:14:27,526 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-26 23:14:27,526 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-26 23:14:27,526 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true;unknown-allowed=true; [2020-10-26 23:14:27,966 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-26 23:14:28,021 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-26 23:14:28,024 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-26 23:14:28,026 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-26 23:14:28,027 INFO L275 PluginConnector]: CDTParser initialized [2020-10-26 23:14:28,028 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem13_label42.c [2020-10-26 23:14:28,129 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/01c97b00b/9c65b7f918d245a1bac62b763991c67b/FLAGf1ed65435 [2020-10-26 23:14:29,293 INFO L306 CDTParser]: Found 1 translation units. [2020-10-26 23:14:29,294 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem13_label42.c [2020-10-26 23:14:29,345 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/01c97b00b/9c65b7f918d245a1bac62b763991c67b/FLAGf1ed65435 [2020-10-26 23:14:29,640 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/01c97b00b/9c65b7f918d245a1bac62b763991c67b [2020-10-26 23:14:29,644 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-26 23:14:29,651 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-26 23:14:29,655 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-26 23:14:29,656 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-26 23:14:29,660 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-26 23:14:29,662 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 11:14:29" (1/1) ... [2020-10-26 23:14:29,667 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3965b1a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:29, skipping insertion in model container [2020-10-26 23:14:29,668 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 11:14:29" (1/1) ... [2020-10-26 23:14:29,677 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-26 23:14:29,887 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-26 23:14:31,544 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-26 23:14:31,561 INFO L203 MainTranslator]: Completed pre-run [2020-10-26 23:14:32,667 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-26 23:14:32,716 INFO L208 MainTranslator]: Completed translation [2020-10-26 23:14:32,717 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32 WrapperNode [2020-10-26 23:14:32,717 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-26 23:14:32,719 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-26 23:14:32,719 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-26 23:14:32,719 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-26 23:14:32,735 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32" (1/1) ... [2020-10-26 23:14:32,738 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32" (1/1) ... [2020-10-26 23:14:32,838 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32" (1/1) ... [2020-10-26 23:14:32,839 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32" (1/1) ... [2020-10-26 23:14:33,042 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32" (1/1) ... [2020-10-26 23:14:33,167 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32" (1/1) ... [2020-10-26 23:14:33,216 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32" (1/1) ... [2020-10-26 23:14:33,260 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-26 23:14:33,261 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-26 23:14:33,262 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-26 23:14:33,262 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-26 23:14:33,263 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32" (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 [2020-10-26 23:14:33,357 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-26 23:14:33,357 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-26 23:14:33,357 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-26 23:14:33,357 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-26 23:14:33,357 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-26 23:14:33,358 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-26 23:14:33,358 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-26 23:14:33,358 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-26 23:14:33,358 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-26 23:14:33,358 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-26 23:14:33,358 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-26 23:14:33,359 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-26 23:14:33,359 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-26 23:14:33,359 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-26 23:14:33,359 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-26 23:14:33,359 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-26 23:14:33,359 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-26 23:14:33,360 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-26 23:14:33,360 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-26 23:14:33,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-26 23:14:33,360 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-26 23:14:33,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-26 23:14:33,360 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-26 23:14:33,361 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-26 23:14:33,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-26 23:14:45,835 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-26 23:14:45,836 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-26 23:14:45,840 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:14:45 BoogieIcfgContainer [2020-10-26 23:14:45,841 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-26 23:14:45,842 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-26 23:14:45,843 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-26 23:14:45,847 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-26 23:14:45,847 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 11:14:29" (1/3) ... [2020-10-26 23:14:45,848 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61c7fc5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 11:14:45, skipping insertion in model container [2020-10-26 23:14:45,848 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:14:32" (2/3) ... [2020-10-26 23:14:45,849 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61c7fc5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 11:14:45, skipping insertion in model container [2020-10-26 23:14:45,849 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:14:45" (3/3) ... [2020-10-26 23:14:45,850 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem13_label42.c [2020-10-26 23:14:45,864 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-26 23:14:45,870 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-26 23:14:45,885 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-26 23:14:45,923 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-26 23:14:45,923 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-26 23:14:45,923 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-26 23:14:45,924 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-26 23:14:45,924 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-26 23:14:45,924 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-26 23:14:45,924 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-26 23:14:45,924 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-26 23:14:46,043 INFO L276 IsEmpty]: Start isEmpty. Operand 1123 states. [2020-10-26 23:14:46,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-10-26 23:14:46,054 INFO L414 BasicCegarLoop]: Found error trace [2020-10-26 23:14:46,055 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-26 23:14:46,056 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-26 23:14:46,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 23:14:46,067 INFO L82 PathProgramCache]: Analyzing trace with hash 115140930, now seen corresponding path program 1 times [2020-10-26 23:14:46,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-26 23:14:46,081 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817702034] [2020-10-26 23:14:46,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 23:14:46,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:14:46,525 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:14:47,140 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:14:47,140 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 82 [2020-10-26 23:14:47,141 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:14:47,141 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 765 [2020-10-26 23:14:47,143 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:14:47,144 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-26 23:14:47,144 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-26 23:14:47,144 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 73 [2020-10-26 23:14:47,144 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-26 23:14:47,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-26 23:14:47,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:14:47,349 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:14:47,371 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:14:47,371 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-26 23:14:47,371 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:14:47,372 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 26 [2020-10-26 23:14:47,372 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:14:47,372 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-26 23:14:47,372 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-26 23:14:47,372 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-26 23:14:47,373 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:14:47,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-26 23:14:47,412 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817702034] [2020-10-26 23:14:47,414 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-26 23:14:47,415 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-26 23:14:47,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575064605] [2020-10-26 23:14:47,422 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-26 23:14:47,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-26 23:14:47,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-26 23:14:47,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-26 23:14:47,443 INFO L87 Difference]: Start difference. First operand 1123 states. Second operand 4 states. [2020-10-26 23:15:05,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-26 23:15:05,408 INFO L93 Difference]: Finished difference Result 3209 states and 5919 transitions. [2020-10-26 23:15:05,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-26 23:15:05,411 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 72 [2020-10-26 23:15:05,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-26 23:15:05,465 INFO L225 Difference]: With dead ends: 3209 [2020-10-26 23:15:05,465 INFO L226 Difference]: Without dead ends: 2007 [2020-10-26 23:15:05,480 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 [2020-10-26 23:15:05,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2007 states. [2020-10-26 23:15:05,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2007 to 1921. [2020-10-26 23:15:05,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1921 states. [2020-10-26 23:15:05,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1921 states to 1921 states and 3312 transitions. [2020-10-26 23:15:05,674 INFO L78 Accepts]: Start accepts. Automaton has 1921 states and 3312 transitions. Word has length 72 [2020-10-26 23:15:05,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-26 23:15:05,675 INFO L481 AbstractCegarLoop]: Abstraction has 1921 states and 3312 transitions. [2020-10-26 23:15:05,676 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-26 23:15:05,676 INFO L276 IsEmpty]: Start isEmpty. Operand 1921 states and 3312 transitions. [2020-10-26 23:15:05,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2020-10-26 23:15:05,683 INFO L414 BasicCegarLoop]: Found error trace [2020-10-26 23:15:05,684 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-10-26 23:15:05,684 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-26 23:15:05,685 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-26 23:15:05,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 23:15:05,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1248971450, now seen corresponding path program 1 times [2020-10-26 23:15:05,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-26 23:15:05,687 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404815045] [2020-10-26 23:15:05,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 23:15:05,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:15:05,798 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:05,992 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:07,149 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:08,269 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:15:08,270 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 153 [2020-10-26 23:15:08,270 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-26 23:15:08,270 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2517 [2020-10-26 23:15:08,272 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:15:08,272 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-26 23:15:08,273 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-26 23:15:08,274 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 75 [2020-10-26 23:15:08,275 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-26 23:15:08,501 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-26 23:15:08,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-26 23:15:08,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:15:08,518 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:08,538 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:15:08,539 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-26 23:15:08,539 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:15:08,540 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 24 [2020-10-26 23:15:08,540 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:15:08,541 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-26 23:15:08,542 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-26 23:15:08,549 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-26 23:15:08,549 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 9 [2020-10-26 23:15:08,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-26 23:15:08,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:15:08,679 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:08,891 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:15:08,892 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 70 [2020-10-26 23:15:08,892 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:15:08,892 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 235 [2020-10-26 23:15:08,892 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:15:08,892 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-26 23:15:08,893 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-26 23:15:08,893 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 70 [2020-10-26 23:15:08,893 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:15:09,052 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-26 23:15:09,053 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404815045] [2020-10-26 23:15:09,053 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-26 23:15:09,054 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-26 23:15:09,054 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193763897] [2020-10-26 23:15:09,058 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-26 23:15:09,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-26 23:15:09,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-26 23:15:09,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-26 23:15:09,066 INFO L87 Difference]: Start difference. First operand 1921 states and 3312 transitions. Second operand 7 states. [2020-10-26 23:15:09,220 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-10-26 23:15:37,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-26 23:15:37,535 INFO L93 Difference]: Finished difference Result 5772 states and 9990 transitions. [2020-10-26 23:15:37,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-26 23:15:37,537 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 141 [2020-10-26 23:15:37,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-26 23:15:37,572 INFO L225 Difference]: With dead ends: 5772 [2020-10-26 23:15:37,572 INFO L226 Difference]: Without dead ends: 3857 [2020-10-26 23:15:37,580 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-10-26 23:15:37,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3857 states. [2020-10-26 23:15:37,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3857 to 3766. [2020-10-26 23:15:37,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3766 states. [2020-10-26 23:15:37,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3766 states to 3766 states and 5893 transitions. [2020-10-26 23:15:37,755 INFO L78 Accepts]: Start accepts. Automaton has 3766 states and 5893 transitions. Word has length 141 [2020-10-26 23:15:37,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-26 23:15:37,759 INFO L481 AbstractCegarLoop]: Abstraction has 3766 states and 5893 transitions. [2020-10-26 23:15:37,759 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-26 23:15:37,759 INFO L276 IsEmpty]: Start isEmpty. Operand 3766 states and 5893 transitions. [2020-10-26 23:15:37,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-10-26 23:15:37,769 INFO L414 BasicCegarLoop]: Found error trace [2020-10-26 23:15:37,769 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-10-26 23:15:37,769 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-26 23:15:37,769 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-26 23:15:37,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 23:15:37,771 INFO L82 PathProgramCache]: Analyzing trace with hash 7592858, now seen corresponding path program 1 times [2020-10-26 23:15:37,771 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-26 23:15:37,772 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191571585] [2020-10-26 23:15:37,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 23:15:37,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:15:37,879 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:38,029 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:39,121 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:40,203 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:15:40,203 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 159 [2020-10-26 23:15:40,203 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-26 23:15:40,204 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2353 [2020-10-26 23:15:40,204 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:15:40,204 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-26 23:15:40,204 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-26 23:15:40,204 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 81 [2020-10-26 23:15:40,204 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:15:40,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-26 23:15:40,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:15:40,352 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:40,364 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:15:40,364 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-26 23:15:40,364 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:15:40,365 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 14 [2020-10-26 23:15:40,365 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:15:40,365 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-26 23:15:40,365 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-26 23:15:40,365 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-26 23:15:40,365 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:15:40,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-26 23:15:40,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:15:40,424 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:15:40,558 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:15:40,559 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 76 [2020-10-26 23:15:40,559 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:15:40,559 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 147 [2020-10-26 23:15:40,559 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:15:40,559 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-26 23:15:40,560 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-26 23:15:40,560 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 76 [2020-10-26 23:15:40,560 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:15:40,676 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-26 23:15:40,677 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191571585] [2020-10-26 23:15:40,678 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-26 23:15:40,678 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-26 23:15:40,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332879089] [2020-10-26 23:15:40,680 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-26 23:15:40,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-26 23:15:40,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-26 23:15:40,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-26 23:15:40,682 INFO L87 Difference]: Start difference. First operand 3766 states and 5893 transitions. Second operand 7 states. [2020-10-26 23:16:14,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-26 23:16:14,313 INFO L93 Difference]: Finished difference Result 11287 states and 18117 transitions. [2020-10-26 23:16:14,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-26 23:16:14,315 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 147 [2020-10-26 23:16:14,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-26 23:16:14,376 INFO L225 Difference]: With dead ends: 11287 [2020-10-26 23:16:14,377 INFO L226 Difference]: Without dead ends: 7527 [2020-10-26 23:16:14,393 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-10-26 23:16:14,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7527 states. [2020-10-26 23:16:14,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7527 to 7287. [2020-10-26 23:16:14,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7287 states. [2020-10-26 23:16:14,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7287 states to 7287 states and 10596 transitions. [2020-10-26 23:16:14,731 INFO L78 Accepts]: Start accepts. Automaton has 7287 states and 10596 transitions. Word has length 147 [2020-10-26 23:16:14,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-26 23:16:14,734 INFO L481 AbstractCegarLoop]: Abstraction has 7287 states and 10596 transitions. [2020-10-26 23:16:14,734 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-26 23:16:14,736 INFO L276 IsEmpty]: Start isEmpty. Operand 7287 states and 10596 transitions. [2020-10-26 23:16:14,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2020-10-26 23:16:14,746 INFO L414 BasicCegarLoop]: Found error trace [2020-10-26 23:16:14,746 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-10-26 23:16:14,747 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-26 23:16:14,747 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-26 23:16:14,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 23:16:14,748 INFO L82 PathProgramCache]: Analyzing trace with hash 1455379546, now seen corresponding path program 1 times [2020-10-26 23:16:14,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-26 23:16:14,749 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696915955] [2020-10-26 23:16:14,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 23:16:14,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:16:14,856 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:15,222 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:16,443 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:16:16,444 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 191 [2020-10-26 23:16:16,444 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-26 23:16:16,444 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1636 [2020-10-26 23:16:16,444 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:16:16,445 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-26 23:16:16,445 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-26 23:16:16,445 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 113 [2020-10-26 23:16:16,445 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:16:16,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-26 23:16:16,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:16:16,613 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:16,628 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:16:16,629 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-26 23:16:16,629 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:16:16,629 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 18 [2020-10-26 23:16:16,630 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:16:16,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-26 23:16:16,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-26 23:16:16,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-26 23:16:16,630 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:16:16,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-26 23:16:16,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:16:16,728 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:16,973 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:16:16,973 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 108 [2020-10-26 23:16:16,973 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:16:16,974 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 270 [2020-10-26 23:16:16,974 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:16:16,974 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-26 23:16:16,975 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-26 23:16:16,976 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 108 [2020-10-26 23:16:16,976 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-26 23:16:17,126 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-26 23:16:17,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696915955] [2020-10-26 23:16:17,127 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-26 23:16:17,127 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-26 23:16:17,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330078296] [2020-10-26 23:16:17,129 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-26 23:16:17,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-26 23:16:17,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-26 23:16:17,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-26 23:16:17,144 INFO L87 Difference]: Start difference. First operand 7287 states and 10596 transitions. Second operand 7 states. [2020-10-26 23:16:43,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-26 23:16:43,940 INFO L93 Difference]: Finished difference Result 22286 states and 34170 transitions. [2020-10-26 23:16:43,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-26 23:16:43,941 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 179 [2020-10-26 23:16:43,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-26 23:16:44,060 INFO L225 Difference]: With dead ends: 22286 [2020-10-26 23:16:44,060 INFO L226 Difference]: Without dead ends: 15005 [2020-10-26 23:16:44,099 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-10-26 23:16:44,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15005 states. [2020-10-26 23:16:44,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15005 to 14530. [2020-10-26 23:16:44,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14530 states. [2020-10-26 23:16:44,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14530 states to 14530 states and 19766 transitions. [2020-10-26 23:16:44,691 INFO L78 Accepts]: Start accepts. Automaton has 14530 states and 19766 transitions. Word has length 179 [2020-10-26 23:16:44,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-26 23:16:44,693 INFO L481 AbstractCegarLoop]: Abstraction has 14530 states and 19766 transitions. [2020-10-26 23:16:44,693 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-26 23:16:44,693 INFO L276 IsEmpty]: Start isEmpty. Operand 14530 states and 19766 transitions. [2020-10-26 23:16:44,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-10-26 23:16:44,697 INFO L414 BasicCegarLoop]: Found error trace [2020-10-26 23:16:44,698 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-10-26 23:16:44,698 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-26 23:16:44,698 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-26 23:16:44,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 23:16:44,699 INFO L82 PathProgramCache]: Analyzing trace with hash 1708106934, now seen corresponding path program 1 times [2020-10-26 23:16:44,699 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-26 23:16:44,699 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523813914] [2020-10-26 23:16:44,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 23:16:44,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:16:44,780 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:45,091 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:45,192 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:45,921 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:47,125 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:16:47,125 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 202 [2020-10-26 23:16:47,125 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-26 23:16:47,125 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2379 [2020-10-26 23:16:47,125 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:16:47,126 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-26 23:16:47,126 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-26 23:16:47,126 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 192 [2020-10-26 23:16:47,126 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:16:47,432 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-26 23:16:47,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-26 23:16:47,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:16:47,445 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:47,462 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:16:47,463 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-26 23:16:47,463 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:16:47,463 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 22 [2020-10-26 23:16:47,464 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:16:47,464 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-26 23:16:47,464 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-26 23:16:47,464 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-26 23:16:47,464 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:16:47,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-26 23:16:47,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:16:47,570 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:47,750 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:16:47,967 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:16:47,968 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 119 [2020-10-26 23:16:47,968 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-26 23:16:47,968 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 419 [2020-10-26 23:16:47,968 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:16:47,969 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-26 23:16:47,969 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-26 23:16:47,969 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 119 [2020-10-26 23:16:47,974 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-10-26 23:16:48,336 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 60 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-26 23:16:48,336 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523813914] [2020-10-26 23:16:48,336 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-26 23:16:48,337 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-26 23:16:48,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706944929] [2020-10-26 23:16:48,337 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-26 23:16:48,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-26 23:16:48,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-26 23:16:48,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-10-26 23:16:48,339 INFO L87 Difference]: Start difference. First operand 14530 states and 19766 transitions. Second operand 8 states. [2020-10-26 23:16:48,547 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-10-26 23:17:15,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-26 23:17:15,752 INFO L93 Difference]: Finished difference Result 31030 states and 46480 transitions. [2020-10-26 23:17:15,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-26 23:17:15,755 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 190 [2020-10-26 23:17:15,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-26 23:17:15,937 INFO L225 Difference]: With dead ends: 31030 [2020-10-26 23:17:15,937 INFO L226 Difference]: Without dead ends: 16506 [2020-10-26 23:17:15,976 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-10-26 23:17:15,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16506 states. [2020-10-26 23:17:16,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16506 to 15602. [2020-10-26 23:17:16,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15602 states. [2020-10-26 23:17:16,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15602 states to 15602 states and 21058 transitions. [2020-10-26 23:17:16,716 INFO L78 Accepts]: Start accepts. Automaton has 15602 states and 21058 transitions. Word has length 190 [2020-10-26 23:17:16,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-26 23:17:16,717 INFO L481 AbstractCegarLoop]: Abstraction has 15602 states and 21058 transitions. [2020-10-26 23:17:16,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-26 23:17:16,717 INFO L276 IsEmpty]: Start isEmpty. Operand 15602 states and 21058 transitions. [2020-10-26 23:17:16,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2020-10-26 23:17:16,724 INFO L414 BasicCegarLoop]: Found error trace [2020-10-26 23:17:16,725 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 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] [2020-10-26 23:17:16,725 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-26 23:17:16,725 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-26 23:17:16,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 23:17:16,726 INFO L82 PathProgramCache]: Analyzing trace with hash 2020990346, now seen corresponding path program 1 times [2020-10-26 23:17:16,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-26 23:17:16,726 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39001486] [2020-10-26 23:17:16,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 23:17:16,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:17:16,895 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:17,042 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:17,347 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:18,843 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:21,856 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:17:21,857 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 268 [2020-10-26 23:17:21,857 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-26 23:17:21,857 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5011 [2020-10-26 23:17:21,857 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:17:21,858 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-26 23:17:21,858 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-26 23:17:21,858 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 99 [2020-10-26 23:17:21,858 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:17:22,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-26 23:17:22,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:17:22,076 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:22,090 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:17:22,090 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-26 23:17:22,091 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:17:22,091 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 17 [2020-10-26 23:17:22,091 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:17:22,091 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-26 23:17:22,091 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-26 23:17:22,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-26 23:17:22,092 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:17:22,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-26 23:17:22,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:17:22,184 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:22,401 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:17:22,402 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 94 [2020-10-26 23:17:22,402 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:17:22,402 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 235 [2020-10-26 23:17:22,402 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:17:22,402 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-26 23:17:22,402 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-26 23:17:22,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 94 [2020-10-26 23:17:22,403 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:17:22,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101 [2020-10-26 23:17:22,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:17:22,644 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:22,709 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:17:22,710 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 90 [2020-10-26 23:17:22,710 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:17:22,710 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 88 [2020-10-26 23:17:22,711 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:17:22,711 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-26 23:17:22,711 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 87 [2020-10-26 23:17:22,711 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-26 23:17:22,712 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-26 23:17:23,026 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 128 proven. 84 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-26 23:17:23,027 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39001486] [2020-10-26 23:17:23,029 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-26 23:17:23,029 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-26 23:17:23,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886368543] [2020-10-26 23:17:23,031 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-26 23:17:23,031 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-26 23:17:23,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-26 23:17:23,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-26 23:17:23,033 INFO L87 Difference]: Start difference. First operand 15602 states and 21058 transitions. Second operand 7 states. [2020-10-26 23:17:23,251 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-10-26 23:17:25,272 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-10-26 23:17:48,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-26 23:17:48,697 INFO L93 Difference]: Finished difference Result 30899 states and 42342 transitions. [2020-10-26 23:17:48,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-26 23:17:48,699 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 254 [2020-10-26 23:17:48,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-26 23:17:48,771 INFO L225 Difference]: With dead ends: 30899 [2020-10-26 23:17:48,771 INFO L226 Difference]: Without dead ends: 16106 [2020-10-26 23:17:48,805 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2020-10-26 23:17:48,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16106 states. [2020-10-26 23:17:49,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16106 to 15696. [2020-10-26 23:17:49,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15696 states. [2020-10-26 23:17:49,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15696 states to 15696 states and 21215 transitions. [2020-10-26 23:17:49,254 INFO L78 Accepts]: Start accepts. Automaton has 15696 states and 21215 transitions. Word has length 254 [2020-10-26 23:17:49,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-26 23:17:49,255 INFO L481 AbstractCegarLoop]: Abstraction has 15696 states and 21215 transitions. [2020-10-26 23:17:49,255 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-26 23:17:49,255 INFO L276 IsEmpty]: Start isEmpty. Operand 15696 states and 21215 transitions. [2020-10-26 23:17:49,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-10-26 23:17:49,261 INFO L414 BasicCegarLoop]: Found error trace [2020-10-26 23:17:49,262 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 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] [2020-10-26 23:17:49,262 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-26 23:17:49,262 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-26 23:17:49,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 23:17:49,264 INFO L82 PathProgramCache]: Analyzing trace with hash 658705153, now seen corresponding path program 1 times [2020-10-26 23:17:49,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-26 23:17:49,265 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167423683] [2020-10-26 23:17:49,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 23:17:49,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:17:49,382 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:49,502 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:50,269 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:52,157 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:17:52,158 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 275 [2020-10-26 23:17:52,158 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-26 23:17:52,158 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2820 [2020-10-26 23:17:52,159 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:17:52,159 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-26 23:17:52,159 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-26 23:17:52,159 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 197 [2020-10-26 23:17:52,160 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:17:52,341 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-26 23:17:52,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-26 23:17:52,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:17:52,351 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:52,366 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:17:52,366 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-26 23:17:52,367 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:17:52,367 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 17 [2020-10-26 23:17:52,367 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:17:52,367 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-26 23:17:52,367 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-26 23:17:52,367 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-26 23:17:52,368 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:17:52,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-26 23:17:52,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:17:52,460 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:52,607 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:17:52,607 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 101 [2020-10-26 23:17:52,607 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:17:52,608 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 162 [2020-10-26 23:17:52,608 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:17:52,608 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-26 23:17:52,608 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-26 23:17:52,608 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 101 [2020-10-26 23:17:52,609 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:17:52,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 108 [2020-10-26 23:17:52,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 23:17:52,898 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-26 23:17:53,056 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-26 23:17:53,056 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 90 [2020-10-26 23:17:53,056 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-26 23:17:53,057 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 176 [2020-10-26 23:17:53,057 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-26 23:17:53,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-26 23:17:53,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-26 23:17:53,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 90 [2020-10-26 23:17:53,058 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-26 23:17:53,422 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 211 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-26 23:17:53,422 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167423683] [2020-10-26 23:17:53,422 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-26 23:17:53,423 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-26 23:17:53,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351182277] [2020-10-26 23:17:53,424 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-26 23:17:53,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-26 23:17:53,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-26 23:17:53,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2020-10-26 23:17:53,426 INFO L87 Difference]: Start difference. First operand 15696 states and 21215 transitions. Second operand 8 states. [2020-10-26 23:17:53,589 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 66