/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/Problem19_label25.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-27 00:44:02,963 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-27 00:44:02,965 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-27 00:44:03,004 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-27 00:44:03,005 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-27 00:44:03,006 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-27 00:44:03,008 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-27 00:44:03,010 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-27 00:44:03,013 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-27 00:44:03,014 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-27 00:44:03,015 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-27 00:44:03,016 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-27 00:44:03,017 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-27 00:44:03,018 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-27 00:44:03,020 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-27 00:44:03,021 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-27 00:44:03,022 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-27 00:44:03,023 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-27 00:44:03,025 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-27 00:44:03,041 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-27 00:44:03,043 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-27 00:44:03,045 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-27 00:44:03,047 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-27 00:44:03,047 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-27 00:44:03,054 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-27 00:44:03,057 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-27 00:44:03,058 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-27 00:44:03,059 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-27 00:44:03,059 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-27 00:44:03,061 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-27 00:44:03,062 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-27 00:44:03,062 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-27 00:44:03,063 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-27 00:44:03,064 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-27 00:44:03,069 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-27 00:44:03,070 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-27 00:44:03,071 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-27 00:44:03,071 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-27 00:44:03,071 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-27 00:44:03,072 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-27 00:44:03,073 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-27 00:44:03,077 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-27 00:44:03,126 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-27 00:44:03,127 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-27 00:44:03,131 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-27 00:44:03,131 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-27 00:44:03,131 INFO L138 SettingsManager]: * Use SBE=true [2020-10-27 00:44:03,131 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-27 00:44:03,131 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-27 00:44:03,132 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-27 00:44:03,132 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-27 00:44:03,132 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-27 00:44:03,132 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-27 00:44:03,132 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-27 00:44:03,133 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-27 00:44:03,133 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-27 00:44:03,134 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-27 00:44:03,134 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-27 00:44:03,134 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-27 00:44:03,135 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-27 00:44:03,135 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-27 00:44:03,135 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-27 00:44:03,135 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-27 00:44:03,135 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 00:44:03,136 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-27 00:44:03,136 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-27 00:44:03,136 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-27 00:44:03,136 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-27 00:44:03,137 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-27 00:44:03,137 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-27 00:44:03,138 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-27 00:44:03,138 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true;unknown-allowed=true; [2020-10-27 00:44:03,492 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-27 00:44:03,521 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-27 00:44:03,524 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-27 00:44:03,525 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-27 00:44:03,526 INFO L275 PluginConnector]: CDTParser initialized [2020-10-27 00:44:03,527 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem19_label25.c [2020-10-27 00:44:03,606 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9e2dc1705/b6be34516daa4a4c9999465d3f01539c/FLAG3f767e793 [2020-10-27 00:44:04,900 INFO L306 CDTParser]: Found 1 translation units. [2020-10-27 00:44:04,900 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem19_label25.c [2020-10-27 00:44:04,961 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9e2dc1705/b6be34516daa4a4c9999465d3f01539c/FLAG3f767e793 [2020-10-27 00:44:05,155 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9e2dc1705/b6be34516daa4a4c9999465d3f01539c [2020-10-27 00:44:05,160 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-27 00:44:05,167 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-27 00:44:05,171 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-27 00:44:05,171 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-27 00:44:05,175 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-27 00:44:05,176 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 12:44:05" (1/1) ... [2020-10-27 00:44:05,181 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@478994f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:05, skipping insertion in model container [2020-10-27 00:44:05,181 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 12:44:05" (1/1) ... [2020-10-27 00:44:05,190 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-27 00:44:05,414 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-27 00:44:07,440 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 00:44:07,451 INFO L203 MainTranslator]: Completed pre-run [2020-10-27 00:44:08,781 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 00:44:08,836 INFO L208 MainTranslator]: Completed translation [2020-10-27 00:44:08,837 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08 WrapperNode [2020-10-27 00:44:08,837 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-27 00:44:08,838 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-27 00:44:08,839 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-27 00:44:08,839 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-27 00:44:08,854 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08" (1/1) ... [2020-10-27 00:44:08,856 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08" (1/1) ... [2020-10-27 00:44:09,046 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08" (1/1) ... [2020-10-27 00:44:09,046 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08" (1/1) ... [2020-10-27 00:44:09,295 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08" (1/1) ... [2020-10-27 00:44:09,337 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08" (1/1) ... [2020-10-27 00:44:09,425 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08" (1/1) ... [2020-10-27 00:44:09,526 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-27 00:44:09,527 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-27 00:44:09,527 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-27 00:44:09,624 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-27 00:44:09,625 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 00:44:09,730 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-27 00:44:09,730 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-27 00:44:09,731 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-27 00:44:09,731 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-27 00:44:09,731 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-27 00:44:09,731 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-27 00:44:09,731 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-27 00:44:09,732 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2020-10-27 00:44:09,732 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2020-10-27 00:44:09,732 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-27 00:44:09,733 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-27 00:44:09,733 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-27 00:44:09,733 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-27 00:44:09,733 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-27 00:44:09,733 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2020-10-27 00:44:09,734 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2020-10-27 00:44:09,734 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-27 00:44:09,735 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-27 00:44:09,735 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-27 00:44:09,735 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-27 00:44:09,735 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-27 00:44:09,735 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-27 00:44:09,735 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-27 00:44:09,735 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-27 00:44:09,736 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-27 00:44:09,736 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-27 00:44:09,736 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-27 00:44:09,737 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-27 00:44:09,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-27 00:44:23,226 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-27 00:44:23,227 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-27 00:44:23,231 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:44:23 BoogieIcfgContainer [2020-10-27 00:44:23,232 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-27 00:44:23,235 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-27 00:44:23,235 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-27 00:44:23,239 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-27 00:44:23,240 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 12:44:05" (1/3) ... [2020-10-27 00:44:23,240 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@670712b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 12:44:23, skipping insertion in model container [2020-10-27 00:44:23,241 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:44:08" (2/3) ... [2020-10-27 00:44:23,241 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@670712b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 12:44:23, skipping insertion in model container [2020-10-27 00:44:23,241 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:44:23" (3/3) ... [2020-10-27 00:44:23,243 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem19_label25.c [2020-10-27 00:44:23,255 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-27 00:44:23,262 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-27 00:44:23,276 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-27 00:44:23,325 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-27 00:44:23,326 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-27 00:44:23,326 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-27 00:44:23,326 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-27 00:44:23,326 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-27 00:44:23,326 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-27 00:44:23,326 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-27 00:44:23,327 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-27 00:44:23,382 INFO L276 IsEmpty]: Start isEmpty. Operand 1781 states. [2020-10-27 00:44:23,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-10-27 00:44:23,399 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:44:23,400 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] [2020-10-27 00:44:23,401 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:44:23,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:44:23,411 INFO L82 PathProgramCache]: Analyzing trace with hash -811372538, now seen corresponding path program 1 times [2020-10-27 00:44:23,421 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:44:23,421 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049840220] [2020-10-27 00:44:23,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:44:23,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:44:23,714 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:44:24,227 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:44:24,227 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 53 [2020-10-27 00:44:24,228 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:44:24,228 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 571 [2020-10-27 00:44:24,230 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:44:24,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 00:44:24,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:44:24,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 44 [2020-10-27 00:44:24,231 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-27 00:44:24,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:44:24,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:44:24,453 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:44:24,487 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:44:24,487 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:44:24,487 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:44:24,487 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 42 [2020-10-27 00:44:24,488 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:44:24,488 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:44:24,488 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:44:24,488 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:44:24,488 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:44:24,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 00:44:24,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049840220] [2020-10-27 00:44:24,520 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 00:44:24,521 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-27 00:44:24,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611772822] [2020-10-27 00:44:24,527 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-27 00:44:24,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:44:24,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-27 00:44:24,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-27 00:44:24,551 INFO L87 Difference]: Start difference. First operand 1781 states. Second operand 4 states. [2020-10-27 00:44:54,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:44:54,723 INFO L93 Difference]: Finished difference Result 5081 states and 9549 transitions. [2020-10-27 00:44:54,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 00:44:54,726 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 43 [2020-10-27 00:44:54,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:44:54,772 INFO L225 Difference]: With dead ends: 5081 [2020-10-27 00:44:54,772 INFO L226 Difference]: Without dead ends: 3220 [2020-10-27 00:44:54,787 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-27 00:44:54,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3220 states. [2020-10-27 00:44:54,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3220 to 3195. [2020-10-27 00:44:54,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3195 states. [2020-10-27 00:44:55,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3195 states to 3195 states and 5074 transitions. [2020-10-27 00:44:55,012 INFO L78 Accepts]: Start accepts. Automaton has 3195 states and 5074 transitions. Word has length 43 [2020-10-27 00:44:55,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:44:55,015 INFO L481 AbstractCegarLoop]: Abstraction has 3195 states and 5074 transitions. [2020-10-27 00:44:55,015 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-27 00:44:55,015 INFO L276 IsEmpty]: Start isEmpty. Operand 3195 states and 5074 transitions. [2020-10-27 00:44:55,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-10-27 00:44:55,024 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:44:55,025 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:44:55,025 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-27 00:44:55,026 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:44:55,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:44:55,027 INFO L82 PathProgramCache]: Analyzing trace with hash -75454792, now seen corresponding path program 1 times [2020-10-27 00:44:55,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:44:55,027 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [880934875] [2020-10-27 00:44:55,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:44:55,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:44:55,125 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:44:55,230 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:44:55,332 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:44:55,943 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:44:56,493 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:44:56,493 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 126 [2020-10-27 00:44:56,494 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-27 00:44:56,495 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1400 [2020-10-27 00:44:56,498 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:44:56,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 00:44:56,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:44:56,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 76 [2020-10-27 00:44:56,500 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 00:44:56,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:44:56,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:44:56,616 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:44:56,640 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:44:56,640 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:44:56,640 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:44:56,645 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 27 [2020-10-27 00:44:56,645 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:44:56,645 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:44:56,645 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:44:56,646 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:44:56,646 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:44:56,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:44:56,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:44:56,746 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:44:56,798 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:44:56,937 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:44:56,937 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-27 00:44:56,937 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 00:44:56,937 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 216 [2020-10-27 00:44:56,938 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:44:56,938 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:44:56,938 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:44:56,938 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 72 [2020-10-27 00:44:56,938 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:44:57,144 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 00:44:57,144 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [880934875] [2020-10-27 00:44:57,145 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 00:44:57,145 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-27 00:44:57,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513149539] [2020-10-27 00:44:57,150 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-27 00:44:57,150 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:44:57,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-27 00:44:57,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-27 00:44:57,152 INFO L87 Difference]: Start difference. First operand 3195 states and 5074 transitions. Second operand 7 states. [2020-10-27 00:45:35,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:45:35,020 INFO L93 Difference]: Finished difference Result 9558 states and 15357 transitions. [2020-10-27 00:45:35,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-27 00:45:35,025 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 114 [2020-10-27 00:45:35,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:45:35,074 INFO L225 Difference]: With dead ends: 9558 [2020-10-27 00:45:35,074 INFO L226 Difference]: Without dead ends: 6369 [2020-10-27 00:45:35,087 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-10-27 00:45:35,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6369 states. [2020-10-27 00:45:35,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6369 to 6221. [2020-10-27 00:45:35,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6221 states. [2020-10-27 00:45:35,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6221 states to 6221 states and 8832 transitions. [2020-10-27 00:45:35,320 INFO L78 Accepts]: Start accepts. Automaton has 6221 states and 8832 transitions. Word has length 114 [2020-10-27 00:45:35,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:45:35,322 INFO L481 AbstractCegarLoop]: Abstraction has 6221 states and 8832 transitions. [2020-10-27 00:45:35,322 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-27 00:45:35,322 INFO L276 IsEmpty]: Start isEmpty. Operand 6221 states and 8832 transitions. [2020-10-27 00:45:35,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-10-27 00:45:35,332 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:45:35,332 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:45:35,333 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-27 00:45:35,333 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:45:35,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:45:35,335 INFO L82 PathProgramCache]: Analyzing trace with hash 172691702, now seen corresponding path program 1 times [2020-10-27 00:45:35,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:45:35,335 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465285343] [2020-10-27 00:45:35,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:45:35,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:45:35,412 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:45:35,627 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:45:36,519 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:45:36,583 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:45:36,584 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 126 [2020-10-27 00:45:36,584 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 00:45:36,584 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1196 [2020-10-27 00:45:36,584 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:45:36,585 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-27 00:45:36,585 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:45:36,585 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 117 [2020-10-27 00:45:36,585 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:45:36,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:45:36,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:45:36,776 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:45:36,787 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:45:36,787 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:45:36,788 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:45:36,788 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-10-27 00:45:36,788 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:45:36,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:45:36,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:45:36,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:45:36,789 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:45:36,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:45:36,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:45:36,846 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:45:36,952 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:45:36,953 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-27 00:45:36,953 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:45:36,953 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 117 [2020-10-27 00:45:36,953 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:45:36,953 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-27 00:45:36,954 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:45:36,954 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 72 [2020-10-27 00:45:36,954 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:45:37,065 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 00:45:37,066 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465285343] [2020-10-27 00:45:37,066 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 00:45:37,067 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-27 00:45:37,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165682830] [2020-10-27 00:45:37,069 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-27 00:45:37,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:45:37,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-27 00:45:37,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-10-27 00:45:37,072 INFO L87 Difference]: Start difference. First operand 6221 states and 8832 transitions. Second operand 8 states. [2020-10-27 00:46:40,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:46:40,419 INFO L93 Difference]: Finished difference Result 21518 states and 31725 transitions. [2020-10-27 00:46:40,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-27 00:46:40,422 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 114 [2020-10-27 00:46:40,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:46:40,497 INFO L225 Difference]: With dead ends: 21518 [2020-10-27 00:46:40,497 INFO L226 Difference]: Without dead ends: 15303 [2020-10-27 00:46:40,516 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-10-27 00:46:40,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15303 states. [2020-10-27 00:46:40,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15303 to 15128. [2020-10-27 00:46:40,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15128 states. [2020-10-27 00:46:40,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15128 states to 15128 states and 21180 transitions. [2020-10-27 00:46:40,948 INFO L78 Accepts]: Start accepts. Automaton has 15128 states and 21180 transitions. Word has length 114 [2020-10-27 00:46:40,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:46:40,949 INFO L481 AbstractCegarLoop]: Abstraction has 15128 states and 21180 transitions. [2020-10-27 00:46:40,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-27 00:46:40,949 INFO L276 IsEmpty]: Start isEmpty. Operand 15128 states and 21180 transitions. [2020-10-27 00:46:40,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-10-27 00:46:40,951 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:46:40,951 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:46:40,951 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-27 00:46:40,951 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:46:40,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:46:40,952 INFO L82 PathProgramCache]: Analyzing trace with hash 248871949, now seen corresponding path program 1 times [2020-10-27 00:46:40,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:46:40,952 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575210613] [2020-10-27 00:46:40,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:46:40,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:46:41,004 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:46:41,059 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:46:41,396 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:46:41,897 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:46:41,897 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 142 [2020-10-27 00:46:41,897 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 00:46:41,898 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 912 [2020-10-27 00:46:41,898 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:46:41,898 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 00:46:41,898 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:46:41,898 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 91 [2020-10-27 00:46:41,898 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:46:42,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:46:42,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:46:42,044 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:46:42,056 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:46:42,057 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:46:42,057 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:46:42,057 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 14 [2020-10-27 00:46:42,057 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:46:42,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:46:42,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:46:42,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:46:42,058 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:46:42,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:46:42,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:46:42,129 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:46:42,181 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:46:42,402 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:46:42,402 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 88 [2020-10-27 00:46:42,403 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 00:46:42,403 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 289 [2020-10-27 00:46:42,403 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:46:42,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:46:42,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:46:42,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 88 [2020-10-27 00:46:42,404 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:46:42,500 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 00:46:42,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575210613] [2020-10-27 00:46:42,505 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 00:46:42,505 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-27 00:46:42,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10293712] [2020-10-27 00:46:42,507 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-27 00:46:42,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:46:42,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-27 00:46:42,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-27 00:46:42,508 INFO L87 Difference]: Start difference. First operand 15128 states and 21180 transitions. Second operand 7 states. [2020-10-27 00:46:42,674 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-10-27 00:47:44,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:47:44,494 INFO L93 Difference]: Finished difference Result 42893 states and 62547 transitions. [2020-10-27 00:47:44,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-27 00:47:44,499 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 130 [2020-10-27 00:47:44,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:47:44,612 INFO L225 Difference]: With dead ends: 42893 [2020-10-27 00:47:44,612 INFO L226 Difference]: Without dead ends: 27771 [2020-10-27 00:47:44,662 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-10-27 00:47:44,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27771 states. [2020-10-27 00:47:45,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27771 to 27280. [2020-10-27 00:47:45,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27280 states. [2020-10-27 00:47:45,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27280 states to 27280 states and 37936 transitions. [2020-10-27 00:47:45,447 INFO L78 Accepts]: Start accepts. Automaton has 27280 states and 37936 transitions. Word has length 130 [2020-10-27 00:47:45,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:47:45,449 INFO L481 AbstractCegarLoop]: Abstraction has 27280 states and 37936 transitions. [2020-10-27 00:47:45,449 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-27 00:47:45,449 INFO L276 IsEmpty]: Start isEmpty. Operand 27280 states and 37936 transitions. [2020-10-27 00:47:45,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2020-10-27 00:47:45,451 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:47:45,451 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:47:45,451 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-27 00:47:45,451 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:47:45,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:47:45,452 INFO L82 PathProgramCache]: Analyzing trace with hash 470014960, now seen corresponding path program 1 times [2020-10-27 00:47:45,452 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:47:45,452 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093508616] [2020-10-27 00:47:45,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:47:45,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:47:45,662 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:47:45,787 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:47:46,697 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:47:47,235 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:47:47,236 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 156 [2020-10-27 00:47:47,236 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 00:47:47,236 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1727 [2020-10-27 00:47:47,236 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:47:47,236 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 00:47:47,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:47:47,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 107 [2020-10-27 00:47:47,237 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:47:47,421 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 00:47:47,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:47:47,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:47:47,430 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:47:47,438 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:47:47,439 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:47:47,439 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:47:47,439 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-10-27 00:47:47,439 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:47:47,439 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:47:47,439 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:47:47,440 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:47:47,440 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:47:47,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:47:47,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:47:47,528 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:47:47,690 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:47:47,690 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-27 00:47:47,690 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:47:47,690 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 177 [2020-10-27 00:47:47,691 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:47:47,691 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:47:47,691 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:47:47,691 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 102 [2020-10-27 00:47:47,691 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:47:47,939 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 00:47:47,939 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093508616] [2020-10-27 00:47:47,939 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 00:47:47,940 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-27 00:47:47,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500872056] [2020-10-27 00:47:47,940 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-27 00:47:47,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:47:47,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-27 00:47:47,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-27 00:47:47,942 INFO L87 Difference]: Start difference. First operand 27280 states and 37936 transitions. Second operand 7 states. [2020-10-27 00:47:48,127 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-10-27 00:47:51,720 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 66