/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 --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:15:38,259 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:15:38,262 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:15:38,301 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 17:15:38,302 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 17:15:38,310 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 17:15:38,312 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 17:15:38,316 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 17:15:38,318 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 17:15:38,322 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 17:15:38,323 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 17:15:38,324 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 17:15:38,325 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:15:38,327 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:15:38,330 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:15:38,331 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:15:38,333 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:15:38,334 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:15:38,336 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:15:38,344 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:15:38,346 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:15:38,347 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:15:38,348 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:15:38,349 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:15:38,365 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 17:15:38,365 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 17:15:38,366 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 17:15:38,367 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 17:15:38,367 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 17:15:38,368 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 17:15:38,368 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 17:15:38,372 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 17:15:38,373 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 17:15:38,374 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 17:15:38,378 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 17:15:38,378 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 17:15:38,379 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 17:15:38,379 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 17:15:38,379 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:15:38,381 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:15:38,382 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:15:38,383 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 [2020-08-18 17:15:38,421 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:15:38,422 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:15:38,424 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:15:38,424 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:15:38,424 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:15:38,424 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:15:38,425 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:15:38,425 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:15:38,425 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:15:38,425 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:15:38,426 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:15:38,427 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:15:38,427 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:15:38,427 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:15:38,428 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:15:38,428 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:15:38,428 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:15:38,428 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:15:38,428 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:15:38,429 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:15:38,429 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:15:38,429 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:15:38,429 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:15:38,429 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:15:38,430 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:15:38,430 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:15:38,430 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:15:38,430 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:15:38,430 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:15:38,431 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.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 17:15:38,766 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:15:38,787 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:15:38,790 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:15:38,792 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:15:38,792 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:15:38,793 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-18 17:15:38,860 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1eef5dcc2/73d6354de2804b2a9d5768de360c7ff8/FLAG52a4e0bab [2020-08-18 17:15:39,584 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:15:39,585 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-18 17:15:39,607 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1eef5dcc2/73d6354de2804b2a9d5768de360c7ff8/FLAG52a4e0bab [2020-08-18 17:15:39,678 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1eef5dcc2/73d6354de2804b2a9d5768de360c7ff8 [2020-08-18 17:15:39,689 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:15:39,691 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:15:39,695 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:15:39,695 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:15:39,699 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:15:39,700 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:15:39" (1/1) ... [2020-08-18 17:15:39,704 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1da7e78d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:39, skipping insertion in model container [2020-08-18 17:15:39,704 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:15:39" (1/1) ... [2020-08-18 17:15:39,713 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:15:39,938 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:15:41,632 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:15:41,653 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:15:43,281 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:15:43,309 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:15:43,310 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43 WrapperNode [2020-08-18 17:15:43,310 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:15:43,311 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:15:43,311 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:15:43,311 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:15:43,331 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43" (1/1) ... [2020-08-18 17:15:43,331 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43" (1/1) ... [2020-08-18 17:15:43,377 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43" (1/1) ... [2020-08-18 17:15:43,378 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43" (1/1) ... [2020-08-18 17:15:43,450 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43" (1/1) ... [2020-08-18 17:15:43,487 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43" (1/1) ... [2020-08-18 17:15:43,504 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43" (1/1) ... [2020-08-18 17:15:43,528 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:15:43,528 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:15:43,529 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:15:43,529 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:15:43,530 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43" (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 [2020-08-18 17:15:43,618 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:15:43,619 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:15:43,619 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 17:15:43,619 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:15:43,620 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:15:43,620 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 17:15:43,620 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 17:15:43,620 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-18 17:15:43,620 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 17:15:43,621 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 17:15:43,621 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-18 17:15:43,621 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-18 17:15:43,621 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-18 17:15:43,621 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-18 17:15:43,622 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-18 17:15:43,622 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-18 17:15:43,622 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-18 17:15:43,622 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 17:15:43,623 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 17:15:43,623 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:15:43,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:15:43,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:15:48,180 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:15:48,181 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 17:15:48,192 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:15:48 BoogieIcfgContainer [2020-08-18 17:15:48,192 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:15:48,194 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:15:48,194 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:15:48,198 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:15:48,198 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:15:39" (1/3) ... [2020-08-18 17:15:48,199 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41b24b8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:15:48, skipping insertion in model container [2020-08-18 17:15:48,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:43" (2/3) ... [2020-08-18 17:15:48,200 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41b24b8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:15:48, skipping insertion in model container [2020-08-18 17:15:48,200 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:15:48" (3/3) ... [2020-08-18 17:15:48,202 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-18 17:15:48,214 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:15:48,224 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-18 17:15:48,239 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-18 17:15:48,271 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:15:48,272 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:15:48,272 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:15:48,272 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:15:48,272 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:15:48,272 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:15:48,272 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:15:48,273 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:15:48,316 INFO L276 IsEmpty]: Start isEmpty. Operand 1484 states. [2020-08-18 17:15:48,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-08-18 17:15:48,353 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:15:48,358 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:15:48,359 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:15:48,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:15:48,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1064488228, now seen corresponding path program 1 times [2020-08-18 17:15:48,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:15:48,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450432729] [2020-08-18 17:15:48,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:15:50,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:51,634 WARN L193 SmtUtils]: Spent 789.00 ms on a formula simplification that was a NOOP. DAG size: 406 [2020-08-18 17:15:51,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:15:51,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:52,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:15:52,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450432729] [2020-08-18 17:15:52,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:15:52,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 17:15:52,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117919773] [2020-08-18 17:15:52,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:15:52,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:15:52,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:15:52,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:15:52,078 INFO L87 Difference]: Start difference. First operand 1484 states. Second operand 5 states. [2020-08-18 17:16:08,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:16:08,612 INFO L93 Difference]: Finished difference Result 4394 states and 7936 transitions. [2020-08-18 17:16:08,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:16:08,614 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 484 [2020-08-18 17:16:08,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:16:08,653 INFO L225 Difference]: With dead ends: 4394 [2020-08-18 17:16:08,653 INFO L226 Difference]: Without dead ends: 2919 [2020-08-18 17:16:08,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:16:08,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2919 states. [2020-08-18 17:16:08,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2919 to 2865. [2020-08-18 17:16:08,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2865 states. [2020-08-18 17:16:08,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2865 states to 2865 states and 4721 transitions. [2020-08-18 17:16:08,906 INFO L78 Accepts]: Start accepts. Automaton has 2865 states and 4721 transitions. Word has length 484 [2020-08-18 17:16:08,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:16:08,908 INFO L479 AbstractCegarLoop]: Abstraction has 2865 states and 4721 transitions. [2020-08-18 17:16:08,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:16:08,909 INFO L276 IsEmpty]: Start isEmpty. Operand 2865 states and 4721 transitions. [2020-08-18 17:16:08,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-08-18 17:16:08,926 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:16:08,927 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:16:08,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:16:08,928 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:16:08,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:16:08,928 INFO L82 PathProgramCache]: Analyzing trace with hash 1721765960, now seen corresponding path program 1 times [2020-08-18 17:16:08,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:16:08,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279103537] [2020-08-18 17:16:08,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:16:09,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:16:10,823 WARN L193 SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-18 17:16:10,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:16:10,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:16:11,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:16:11,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [279103537] [2020-08-18 17:16:11,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:16:11,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:16:11,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511492485] [2020-08-18 17:16:11,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:16:11,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:16:11,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:16:11,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:16:11,318 INFO L87 Difference]: Start difference. First operand 2865 states and 4721 transitions. Second operand 4 states. [2020-08-18 17:16:30,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:16:30,670 INFO L93 Difference]: Finished difference Result 8316 states and 13666 transitions. [2020-08-18 17:16:30,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:16:30,671 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 486 [2020-08-18 17:16:30,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:16:30,701 INFO L225 Difference]: With dead ends: 8316 [2020-08-18 17:16:30,701 INFO L226 Difference]: Without dead ends: 5665 [2020-08-18 17:16:30,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:16:30,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5665 states. [2020-08-18 17:16:30,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5665 to 5613. [2020-08-18 17:16:30,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5613 states. [2020-08-18 17:16:30,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5613 states to 5613 states and 9225 transitions. [2020-08-18 17:16:30,929 INFO L78 Accepts]: Start accepts. Automaton has 5613 states and 9225 transitions. Word has length 486 [2020-08-18 17:16:30,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:16:30,931 INFO L479 AbstractCegarLoop]: Abstraction has 5613 states and 9225 transitions. [2020-08-18 17:16:30,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:16:30,931 INFO L276 IsEmpty]: Start isEmpty. Operand 5613 states and 9225 transitions. [2020-08-18 17:16:30,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-08-18 17:16:30,953 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:16:30,953 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:16:30,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:16:30,958 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:16:30,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:16:30,959 INFO L82 PathProgramCache]: Analyzing trace with hash 326918239, now seen corresponding path program 1 times [2020-08-18 17:16:30,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:16:30,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875532019] [2020-08-18 17:16:30,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:16:31,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:16:32,037 WARN L193 SmtUtils]: Spent 851.00 ms on a formula simplification that was a NOOP. DAG size: 406 [2020-08-18 17:16:32,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:16:32,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:16:32,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:16:32,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875532019] [2020-08-18 17:16:32,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:16:32,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:16:32,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043357802] [2020-08-18 17:16:32,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:16:32,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:16:32,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:16:32,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:16:32,220 INFO L87 Difference]: Start difference. First operand 5613 states and 9225 transitions. Second operand 4 states.