/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.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=NARROWEST --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 -i ../../../trunk/examples/svcomp/eca-rers2012/Problem19_label16.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-13 10:01:18,521 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-13 10:01:18,524 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-13 10:01:18,556 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-13 10:01:18,556 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-13 10:01:18,558 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-13 10:01:18,560 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-13 10:01:18,563 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-13 10:01:18,565 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-13 10:01:18,567 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-13 10:01:18,569 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-13 10:01:18,571 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-13 10:01:18,572 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-13 10:01:18,574 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-13 10:01:18,576 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-13 10:01:18,577 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-13 10:01:18,579 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-13 10:01:18,580 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-13 10:01:18,583 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-13 10:01:18,586 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-13 10:01:18,588 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-13 10:01:18,589 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-13 10:01:18,591 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-13 10:01:18,593 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-13 10:01:18,596 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-13 10:01:18,597 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-13 10:01:18,598 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-13 10:01:18,599 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-13 10:01:18,600 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-13 10:01:18,602 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-13 10:01:18,602 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-13 10:01:18,603 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-13 10:01:18,604 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-13 10:01:18,608 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-13 10:01:18,610 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-13 10:01:18,611 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-13 10:01:18,612 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-13 10:01:18,612 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-13 10:01:18,612 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-13 10:01:18,614 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-13 10:01:18,615 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-13 10:01:18,616 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 [2020-10-13 10:01:18,646 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-13 10:01:18,646 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-13 10:01:18,648 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-13 10:01:18,649 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-13 10:01:18,649 INFO L138 SettingsManager]: * Use SBE=true [2020-10-13 10:01:18,649 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-13 10:01:18,650 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-13 10:01:18,650 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-13 10:01:18,650 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-13 10:01:18,650 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-13 10:01:18,650 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-13 10:01:18,651 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-13 10:01:18,651 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-13 10:01:18,651 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-13 10:01:18,651 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-13 10:01:18,651 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-13 10:01:18,652 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-13 10:01:18,652 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-13 10:01:18,652 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-13 10:01:18,652 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-13 10:01:18,653 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-13 10:01:18,653 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 10:01:18,653 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-13 10:01:18,653 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-13 10:01:18,654 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-13 10:01:18,654 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-13 10:01:18,654 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-13 10:01:18,654 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-13 10:01:18,654 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-13 10:01:18,655 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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=NARROWEST;log-additional-information=true;unknown-allowed=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=NARROWEST;log-additional-information=true;unknown-allowed=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=NARROWEST;log-additional-information=true;unknown-allowed=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=NARROWEST;log-additional-information=true;unknown-allowed=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=NARROWEST;log-additional-information=true;unknown-allowed=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=NARROWEST;log-additional-information=true;unknown-allowed=true; [2020-10-13 10:01:19,068 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-13 10:01:19,085 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-13 10:01:19,090 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-13 10:01:19,092 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-13 10:01:19,093 INFO L275 PluginConnector]: CDTParser initialized [2020-10-13 10:01:19,095 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem19_label16.c [2020-10-13 10:01:19,198 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8f86aa8fe/4d5519be1cf04e1bafa67ceee53af5a6/FLAG7bc824f05 [2020-10-13 10:01:20,309 INFO L306 CDTParser]: Found 1 translation units. [2020-10-13 10:01:20,310 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem19_label16.c [2020-10-13 10:01:20,396 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8f86aa8fe/4d5519be1cf04e1bafa67ceee53af5a6/FLAG7bc824f05 [2020-10-13 10:01:20,625 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8f86aa8fe/4d5519be1cf04e1bafa67ceee53af5a6 [2020-10-13 10:01:20,640 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-13 10:01:20,644 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-13 10:01:20,646 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-13 10:01:20,646 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-13 10:01:20,652 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-13 10:01:20,654 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:01:20" (1/1) ... [2020-10-13 10:01:20,659 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@347c51ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:20, skipping insertion in model container [2020-10-13 10:01:20,660 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:01:20" (1/1) ... [2020-10-13 10:01:20,672 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-13 10:01:21,012 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-13 10:01:24,073 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 10:01:24,087 INFO L203 MainTranslator]: Completed pre-run [2020-10-13 10:01:25,365 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 10:01:25,446 INFO L208 MainTranslator]: Completed translation [2020-10-13 10:01:25,449 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25 WrapperNode [2020-10-13 10:01:25,450 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-13 10:01:25,453 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-13 10:01:25,453 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-13 10:01:25,453 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-13 10:01:25,478 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25" (1/1) ... [2020-10-13 10:01:25,481 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25" (1/1) ... [2020-10-13 10:01:25,600 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25" (1/1) ... [2020-10-13 10:01:25,601 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25" (1/1) ... [2020-10-13 10:01:25,824 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25" (1/1) ... [2020-10-13 10:01:25,932 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25" (1/1) ... [2020-10-13 10:01:26,023 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25" (1/1) ... [2020-10-13 10:01:26,154 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-13 10:01:26,154 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-13 10:01:26,155 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-13 10:01:26,155 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-13 10:01:26,156 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25" (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 [2020-10-13 10:01:26,294 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-13 10:01:26,294 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-13 10:01:26,294 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-13 10:01:26,295 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-13 10:01:26,295 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-13 10:01:26,296 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-13 10:01:26,297 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2020-10-13 10:01:26,298 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2020-10-13 10:01:26,299 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-13 10:01:26,299 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-13 10:01:26,299 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-13 10:01:26,299 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-13 10:01:26,300 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-13 10:01:26,300 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2020-10-13 10:01:26,300 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2020-10-13 10:01:26,301 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-13 10:01:26,302 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-13 10:01:26,302 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-13 10:01:26,302 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-13 10:01:26,302 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-13 10:01:26,303 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-13 10:01:43,350 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-13 10:01:43,350 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-13 10:01:43,373 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:01:43 BoogieIcfgContainer [2020-10-13 10:01:43,373 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-13 10:01:43,376 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-13 10:01:43,376 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-13 10:01:43,381 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-13 10:01:43,381 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 10:01:20" (1/3) ... [2020-10-13 10:01:43,383 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cb5a2a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:01:43, skipping insertion in model container [2020-10-13 10:01:43,383 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:01:25" (2/3) ... [2020-10-13 10:01:43,384 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cb5a2a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:01:43, skipping insertion in model container [2020-10-13 10:01:43,384 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:01:43" (3/3) ... [2020-10-13 10:01:43,387 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem19_label16.c [2020-10-13 10:01:43,402 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-13 10:01:43,416 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-13 10:01:43,437 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-13 10:01:43,483 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-13 10:01:43,483 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-13 10:01:43,483 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-13 10:01:43,484 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-13 10:01:43,484 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-13 10:01:43,484 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-13 10:01:43,484 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-13 10:01:43,484 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-13 10:01:43,544 INFO L276 IsEmpty]: Start isEmpty. Operand 1777 states. [2020-10-13 10:01:43,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-10-13 10:01:43,556 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:01:43,558 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] [2020-10-13 10:01:43,559 INFO L427 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:01:43,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:01:43,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1649387796, now seen corresponding path program 1 times [2020-10-13 10:01:43,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:01:43,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1222674575] [2020-10-13 10:01:43,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:01:43,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:01:43,875 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:01:44,270 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:01:44,271 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-10-13 10:01:44,271 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:01:44,271 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 459 [2020-10-13 10:01:44,273 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:01:44,273 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 10:01:44,274 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-13 10:01:44,274 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 61 [2020-10-13 10:01:44,274 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-13 10:01:44,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:01:44,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:01:44,438 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:01:44,453 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:01:44,454 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:01:44,454 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:01:44,454 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 17 [2020-10-13 10:01:44,455 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:01:44,455 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:01:44,455 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:01:44,455 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 10:01:44,456 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:01:44,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:01:44,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1222674575] [2020-10-13 10:01:44,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 10:01:44,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-13 10:01:44,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435364793] [2020-10-13 10:01:44,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 10:01:44,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:01:44,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 10:01:44,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:01:44,514 INFO L87 Difference]: Start difference. First operand 1777 states. Second operand 5 states. [2020-10-13 10:02:22,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:02:22,141 INFO L93 Difference]: Finished difference Result 6572 states and 12481 transitions. [2020-10-13 10:02:22,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 10:02:22,144 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 59 [2020-10-13 10:02:22,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:02:22,203 INFO L225 Difference]: With dead ends: 6572 [2020-10-13 10:02:22,203 INFO L226 Difference]: Without dead ends: 4727 [2020-10-13 10:02:22,218 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-10-13 10:02:22,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4727 states. [2020-10-13 10:02:22,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4727 to 4640. [2020-10-13 10:02:22,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4640 states. [2020-10-13 10:02:22,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4640 states to 4640 states and 7457 transitions. [2020-10-13 10:02:22,480 INFO L78 Accepts]: Start accepts. Automaton has 4640 states and 7457 transitions. Word has length 59 [2020-10-13 10:02:22,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:02:22,481 INFO L479 AbstractCegarLoop]: Abstraction has 4640 states and 7457 transitions. [2020-10-13 10:02:22,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 10:02:22,482 INFO L276 IsEmpty]: Start isEmpty. Operand 4640 states and 7457 transitions. [2020-10-13 10:02:22,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2020-10-13 10:02:22,489 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:02:22,489 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:02:22,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-13 10:02:22,490 INFO L427 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:02:22,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:02:22,491 INFO L82 PathProgramCache]: Analyzing trace with hash 1632529598, now seen corresponding path program 1 times [2020-10-13 10:02:22,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:02:22,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993018205] [2020-10-13 10:02:22,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:02:22,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:02:22,576 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:22,897 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:23,776 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:24,164 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:02:24,165 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 144 [2020-10-13 10:02:24,165 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 10:02:24,166 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1622 [2020-10-13 10:02:24,167 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:02:24,167 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:02:24,167 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 85 [2020-10-13 10:02:24,168 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 58 [2020-10-13 10:02:24,172 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 6 [2020-10-13 10:02:24,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:02:24,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:02:24,311 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:24,315 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:02:24,316 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:02:24,316 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:02:24,317 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-10-13 10:02:24,317 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:02:24,318 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:02:24,318 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:02:24,318 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:02:24,318 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:02:24,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-13 10:02:24,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:02:24,393 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:24,507 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:02:24,507 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 76 [2020-10-13 10:02:24,508 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:02:24,508 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 130 [2020-10-13 10:02:24,508 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:02:24,508 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:02:24,508 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:02:24,510 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 70 [2020-10-13 10:02:24,510 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:02:24,577 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 51 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:02:24,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993018205] [2020-10-13 10:02:24,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:02:24,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 10:02:24,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677804996] [2020-10-13 10:02:24,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 10:02:24,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:02:24,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 10:02:24,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:02:24,582 INFO L87 Difference]: Start difference. First operand 4640 states and 7457 transitions. Second operand 5 states. [2020-10-13 10:02:55,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:02:55,937 INFO L93 Difference]: Finished difference Result 10765 states and 17823 transitions. [2020-10-13 10:02:55,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 10:02:55,938 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 134 [2020-10-13 10:02:55,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:02:55,969 INFO L225 Difference]: With dead ends: 10765 [2020-10-13 10:02:55,969 INFO L226 Difference]: Without dead ends: 6131 [2020-10-13 10:02:55,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:02:55,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6131 states. [2020-10-13 10:02:56,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6131 to 6083. [2020-10-13 10:02:56,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6083 states. [2020-10-13 10:02:56,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6083 states to 6083 states and 9439 transitions. [2020-10-13 10:02:56,142 INFO L78 Accepts]: Start accepts. Automaton has 6083 states and 9439 transitions. Word has length 134 [2020-10-13 10:02:56,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:02:56,143 INFO L479 AbstractCegarLoop]: Abstraction has 6083 states and 9439 transitions. [2020-10-13 10:02:56,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 10:02:56,143 INFO L276 IsEmpty]: Start isEmpty. Operand 6083 states and 9439 transitions. [2020-10-13 10:02:56,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2020-10-13 10:02:56,147 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:02:56,147 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:02:56,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-13 10:02:56,148 INFO L427 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:02:56,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:02:56,149 INFO L82 PathProgramCache]: Analyzing trace with hash -708621413, now seen corresponding path program 1 times [2020-10-13 10:02:56,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:02:56,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511687664] [2020-10-13 10:02:56,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:02:56,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:02:56,207 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:56,259 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:56,645 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:56,744 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:57,360 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:57,508 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:02:57,509 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 156 [2020-10-13 10:02:57,509 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-13 10:02:57,509 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1324 [2020-10-13 10:02:57,509 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:02:57,509 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:02:57,510 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 96 [2020-10-13 10:02:57,510 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 59 [2020-10-13 10:02:57,510 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:02:57,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:02:57,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:02:57,628 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:57,631 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:02:57,632 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:02:57,632 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:02:57,632 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-13 10:02:57,632 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:02:57,633 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:02:57,633 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:02:57,633 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:02:57,633 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:02:57,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-13 10:02:57,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:02:57,698 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:02:57,762 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:02:57,762 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 88 [2020-10-13 10:02:57,763 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:02:57,763 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 77 [2020-10-13 10:02:57,763 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:02:57,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:02:57,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:02:57,764 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 81 [2020-10-13 10:02:57,764 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:02:57,837 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 51 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:02:57,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511687664] [2020-10-13 10:02:57,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:02:57,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-13 10:02:57,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370041205] [2020-10-13 10:02:57,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-13 10:02:57,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:02:57,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-13 10:02:57,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:02:57,840 INFO L87 Difference]: Start difference. First operand 6083 states and 9439 transitions. Second operand 6 states. [2020-10-13 10:03:58,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:03:58,439 INFO L93 Difference]: Finished difference Result 13680 states and 21877 transitions. [2020-10-13 10:03:58,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 10:03:58,442 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 146 [2020-10-13 10:03:58,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:03:58,479 INFO L225 Difference]: With dead ends: 13680 [2020-10-13 10:03:58,479 INFO L226 Difference]: Without dead ends: 7603 [2020-10-13 10:03:58,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 10:03:58,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7603 states. [2020-10-13 10:03:58,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7603 to 7492. [2020-10-13 10:03:58,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7492 states. [2020-10-13 10:03:58,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7492 states to 7492 states and 11615 transitions. [2020-10-13 10:03:58,753 INFO L78 Accepts]: Start accepts. Automaton has 7492 states and 11615 transitions. Word has length 146 [2020-10-13 10:03:58,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:03:58,756 INFO L479 AbstractCegarLoop]: Abstraction has 7492 states and 11615 transitions. [2020-10-13 10:03:58,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-13 10:03:58,763 INFO L276 IsEmpty]: Start isEmpty. Operand 7492 states and 11615 transitions. [2020-10-13 10:03:58,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2020-10-13 10:03:58,772 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:03:58,773 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:03:58,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-13 10:03:58,773 INFO L427 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:03:58,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:03:58,774 INFO L82 PathProgramCache]: Analyzing trace with hash 302068576, now seen corresponding path program 1 times [2020-10-13 10:03:58,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:03:58,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104254711] [2020-10-13 10:03:58,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:03:58,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:03:58,875 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:03:59,009 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:00,430 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:00,919 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:04:00,920 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 170 [2020-10-13 10:04:00,921 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 10:04:00,921 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2082 [2020-10-13 10:04:00,921 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:04:00,922 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:04:00,922 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 111 [2020-10-13 10:04:00,923 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-13 10:04:00,923 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-13 10:04:01,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:04:01,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:04:01,196 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:01,200 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:04:01,201 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:04:01,201 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:04:01,201 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-13 10:04:01,201 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:04:01,202 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:04:01,202 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:04:01,202 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:04:01,202 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:04:01,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-13 10:04:01,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:04:01,306 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:01,459 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:04:01,460 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-13 10:04:01,460 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:04:01,461 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 175 [2020-10-13 10:04:01,461 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:04:01,461 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:04:01,462 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:04:01,462 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 96 [2020-10-13 10:04:01,462 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:04:01,659 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 51 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:04:01,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104254711] [2020-10-13 10:04:01,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:04:01,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 10:04:01,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243084948] [2020-10-13 10:04:01,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 10:04:01,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:04:01,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 10:04:01,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:04:01,667 INFO L87 Difference]: Start difference. First operand 7492 states and 11615 transitions. Second operand 5 states. [2020-10-13 10:04:03,398 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-10-13 10:04:55,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:04:55,342 INFO L93 Difference]: Finished difference Result 15008 states and 23273 transitions. [2020-10-13 10:04:55,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 10:04:55,358 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 160 [2020-10-13 10:04:55,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:04:55,403 INFO L225 Difference]: With dead ends: 15008 [2020-10-13 10:04:55,404 INFO L226 Difference]: Without dead ends: 7504 [2020-10-13 10:04:55,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:04:55,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7504 states. [2020-10-13 10:04:55,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7504 to 7492. [2020-10-13 10:04:55,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7492 states. [2020-10-13 10:04:55,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7492 states to 7492 states and 11611 transitions. [2020-10-13 10:04:55,626 INFO L78 Accepts]: Start accepts. Automaton has 7492 states and 11611 transitions. Word has length 160 [2020-10-13 10:04:55,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:04:55,627 INFO L479 AbstractCegarLoop]: Abstraction has 7492 states and 11611 transitions. [2020-10-13 10:04:55,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 10:04:55,627 INFO L276 IsEmpty]: Start isEmpty. Operand 7492 states and 11611 transitions. [2020-10-13 10:04:55,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2020-10-13 10:04:55,633 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:04:55,634 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:04:55,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-13 10:04:55,635 INFO L427 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:04:55,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:04:55,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1543037840, now seen corresponding path program 1 times [2020-10-13 10:04:55,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:04:55,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945337450] [2020-10-13 10:04:55,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:04:55,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:04:55,704 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:55,795 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:56,888 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:57,761 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:04:57,762 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 178 [2020-10-13 10:04:57,763 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 10:04:57,763 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2082 [2020-10-13 10:04:57,763 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:04:57,764 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:04:57,764 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 119 [2020-10-13 10:04:57,764 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-13 10:04:57,765 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:04:58,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:04:58,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:04:58,043 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:58,046 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:04:58,046 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:04:58,047 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:04:58,047 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-13 10:04:58,047 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:04:58,047 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:04:58,048 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:04:58,048 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:04:58,048 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:04:58,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-13 10:04:58,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:04:58,171 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:58,285 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:04:58,285 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 110 [2020-10-13 10:04:58,285 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:04:58,286 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 135 [2020-10-13 10:04:58,286 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:04:58,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:04:58,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:04:58,287 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 104 [2020-10-13 10:04:58,287 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:04:58,418 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 51 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:04:58,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945337450] [2020-10-13 10:04:58,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:04:58,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 10:04:58,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179092591] [2020-10-13 10:04:58,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 10:04:58,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:04:58,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 10:04:58,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:04:58,429 INFO L87 Difference]: Start difference. First operand 7492 states and 11611 transitions. Second operand 5 states. [2020-10-13 10:05:00,516 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 48