/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=BIGGEST -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.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 13:07:40,685 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 13:07:40,688 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 13:07:40,711 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 13:07:40,711 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 13:07:40,715 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 13:07:40,717 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 13:07:40,721 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 13:07:40,725 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 13:07:40,728 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 13:07:40,729 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 13:07:40,730 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 13:07:40,730 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 13:07:40,733 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 13:07:40,734 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 13:07:40,735 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 13:07:40,737 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 13:07:40,741 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 13:07:40,742 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 13:07:40,746 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 13:07:40,750 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 13:07:40,751 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 13:07:40,752 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 13:07:40,753 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 13:07:40,759 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 13:07:40,759 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 13:07:40,760 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 13:07:40,762 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 13:07:40,763 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 13:07:40,765 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 13:07:40,765 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 13:07:40,766 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 13:07:40,766 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 13:07:40,767 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 13:07:40,768 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 13:07:40,768 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 13:07:40,778 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 13:07:40,779 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 13:07:40,779 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 13:07:40,780 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 13:07:40,781 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 13:07:40,781 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 13:07:40,834 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 13:07:40,834 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 13:07:40,835 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 13:07:40,836 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 13:07:40,836 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 13:07:40,836 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 13:07:40,836 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 13:07:40,836 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 13:07:40,837 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 13:07:40,839 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 13:07:40,839 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 13:07:40,840 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 13:07:40,840 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 13:07:40,840 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 13:07:40,840 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 13:07:40,840 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 13:07:40,841 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 13:07:40,841 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 13:07:40,841 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 13:07:40,841 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 13:07:40,841 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 13:07:40,842 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 13:07:40,843 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 13:07:40,843 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 13:07:40,844 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 13:07:40,844 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 13:07:40,844 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 13:07:40,844 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 13:07:40,845 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 13:07:40,845 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=BIGGEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; [2020-08-18 13:07:41,135 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 13:07:41,148 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 13:07:41,151 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 13:07:41,152 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 13:07:41,153 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 13:07:41,153 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 13:07:41,218 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d0b6dc18c/3b400860cf284adfa07c3827ebf7d9dc/FLAG02539de38 [2020-08-18 13:07:41,918 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 13:07:41,919 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 13:07:41,941 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d0b6dc18c/3b400860cf284adfa07c3827ebf7d9dc/FLAG02539de38 [2020-08-18 13:07:42,037 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d0b6dc18c/3b400860cf284adfa07c3827ebf7d9dc [2020-08-18 13:07:42,046 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 13:07:42,047 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 13:07:42,048 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 13:07:42,048 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 13:07:42,052 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 13:07:42,053 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:07:42" (1/1) ... [2020-08-18 13:07:42,055 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46a9d3e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:42, skipping insertion in model container [2020-08-18 13:07:42,056 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:07:42" (1/1) ... [2020-08-18 13:07:42,063 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 13:07:42,275 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 13:07:43,880 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 13:07:43,903 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 13:07:45,021 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 13:07:45,071 INFO L208 MainTranslator]: Completed translation [2020-08-18 13:07:45,073 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45 WrapperNode [2020-08-18 13:07:45,073 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 13:07:45,074 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 13:07:45,075 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 13:07:45,075 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 13:07:45,096 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45" (1/1) ... [2020-08-18 13:07:45,098 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45" (1/1) ... [2020-08-18 13:07:45,157 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45" (1/1) ... [2020-08-18 13:07:45,158 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45" (1/1) ... [2020-08-18 13:07:45,226 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45" (1/1) ... [2020-08-18 13:07:45,267 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45" (1/1) ... [2020-08-18 13:07:45,279 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45" (1/1) ... [2020-08-18 13:07:45,297 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 13:07:45,297 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 13:07:45,298 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 13:07:45,298 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 13:07:45,299 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45" (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 13:07:45,370 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 13:07:45,370 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 13:07:45,371 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 13:07:45,371 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 13:07:45,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 13:07:45,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 13:07:45,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-18 13:07:45,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 13:07:45,373 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-18 13:07:45,373 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 13:07:45,374 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 13:07:45,374 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-18 13:07:45,374 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-18 13:07:45,375 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-18 13:07:45,375 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-18 13:07:45,376 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-18 13:07:45,376 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-18 13:07:45,376 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-18 13:07:45,377 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 13:07:45,377 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 13:07:45,378 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 13:07:45,378 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 13:07:45,378 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 13:07:49,078 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 13:07:49,079 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 13:07:49,098 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:07:49 BoogieIcfgContainer [2020-08-18 13:07:49,101 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 13:07:49,102 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 13:07:49,102 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 13:07:49,105 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 13:07:49,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 01:07:42" (1/3) ... [2020-08-18 13:07:49,107 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7290d089 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:07:49, skipping insertion in model container [2020-08-18 13:07:49,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:45" (2/3) ... [2020-08-18 13:07:49,107 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7290d089 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:07:49, skipping insertion in model container [2020-08-18 13:07:49,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:07:49" (3/3) ... [2020-08-18 13:07:49,109 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 13:07:49,120 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 13:07:49,129 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 13:07:49,144 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 13:07:49,174 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 13:07:49,174 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 13:07:49,175 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 13:07:49,175 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 13:07:49,175 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 13:07:49,175 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 13:07:49,175 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 13:07:49,175 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 13:07:49,215 INFO L276 IsEmpty]: Start isEmpty. Operand 1449 states. [2020-08-18 13:07:49,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-08-18 13:07:49,261 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:07:49,263 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:07:49,263 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:07:49,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:07:49,270 INFO L82 PathProgramCache]: Analyzing trace with hash -2033441387, now seen corresponding path program 1 times [2020-08-18 13:07:49,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:07:49,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434093795] [2020-08-18 13:07:49,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:07:50,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:07:52,158 WARN L193 SmtUtils]: Spent 904.00 ms on a formula simplification that was a NOOP. DAG size: 397 [2020-08-18 13:07:52,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:07:52,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:07:52,464 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 13:07:52,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434093795] [2020-08-18 13:07:52,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:07:52,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 13:07:52,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351224184] [2020-08-18 13:07:52,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 13:07:52,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:07:52,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 13:07:52,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 13:07:52,490 INFO L87 Difference]: Start difference. First operand 1449 states. Second operand 4 states. [2020-08-18 13:07:53,297 WARN L193 SmtUtils]: Spent 717.00 ms on a formula simplification that was a NOOP. DAG size: 398 [2020-08-18 13:08:03,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:08:03,344 INFO L93 Difference]: Finished difference Result 2488 states and 4423 transitions. [2020-08-18 13:08:03,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 13:08:03,346 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-08-18 13:08:03,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:08:03,384 INFO L225 Difference]: With dead ends: 2488 [2020-08-18 13:08:03,384 INFO L226 Difference]: Without dead ends: 2186 [2020-08-18 13:08:03,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 13:08:03,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2186 states. [2020-08-18 13:08:03,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2186 to 2184. [2020-08-18 13:08:03,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2184 states. [2020-08-18 13:08:03,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2184 states to 2184 states and 3563 transitions. [2020-08-18 13:08:03,573 INFO L78 Accepts]: Start accepts. Automaton has 2184 states and 3563 transitions. Word has length 496 [2020-08-18 13:08:03,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:08:03,575 INFO L479 AbstractCegarLoop]: Abstraction has 2184 states and 3563 transitions. [2020-08-18 13:08:03,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 13:08:03,575 INFO L276 IsEmpty]: Start isEmpty. Operand 2184 states and 3563 transitions. [2020-08-18 13:08:03,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-08-18 13:08:03,590 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:08:03,591 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:08:03,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 13:08:03,592 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:08:03,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:08:03,593 INFO L82 PathProgramCache]: Analyzing trace with hash 426855444, now seen corresponding path program 1 times [2020-08-18 13:08:03,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:08:03,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143613498] [2020-08-18 13:08:03,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:08:04,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:08:06,195 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 397 [2020-08-18 13:08:06,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:08:06,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:08:06,692 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 13:08:06,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143613498] [2020-08-18 13:08:06,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:08:06,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 13:08:06,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581699421] [2020-08-18 13:08:06,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 13:08:06,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:08:06,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 13:08:06,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 13:08:06,697 INFO L87 Difference]: Start difference. First operand 2184 states and 3563 transitions. Second operand 5 states. [2020-08-18 13:08:21,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:08:21,619 INFO L93 Difference]: Finished difference Result 6476 states and 10564 transitions. [2020-08-18 13:08:21,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 13:08:21,620 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 496 [2020-08-18 13:08:21,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:08:21,642 INFO L225 Difference]: With dead ends: 6476 [2020-08-18 13:08:21,642 INFO L226 Difference]: Without dead ends: 4309 [2020-08-18 13:08:21,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 13:08:21,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4309 states. [2020-08-18 13:08:21,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4309 to 4307. [2020-08-18 13:08:21,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4307 states. [2020-08-18 13:08:21,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4307 states to 4307 states and 7000 transitions. [2020-08-18 13:08:21,816 INFO L78 Accepts]: Start accepts. Automaton has 4307 states and 7000 transitions. Word has length 496 [2020-08-18 13:08:21,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:08:21,817 INFO L479 AbstractCegarLoop]: Abstraction has 4307 states and 7000 transitions. [2020-08-18 13:08:21,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 13:08:21,817 INFO L276 IsEmpty]: Start isEmpty. Operand 4307 states and 7000 transitions. [2020-08-18 13:08:21,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-08-18 13:08:21,833 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:08:21,837 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:08:21,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 13:08:21,837 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:08:21,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:08:21,838 INFO L82 PathProgramCache]: Analyzing trace with hash 589891249, now seen corresponding path program 1 times [2020-08-18 13:08:21,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:08:21,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [120932188] [2020-08-18 13:08:21,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:08:22,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:08:23,135 WARN L193 SmtUtils]: Spent 706.00 ms on a formula simplification that was a NOOP. DAG size: 397 [2020-08-18 13:08:23,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:08:23,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:08:23,430 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 13:08:23,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [120932188] [2020-08-18 13:08:23,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:08:23,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 13:08:23,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853993525] [2020-08-18 13:08:23,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 13:08:23,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:08:23,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 13:08:23,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 13:08:23,433 INFO L87 Difference]: Start difference. First operand 4307 states and 7000 transitions. Second operand 4 states.