/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_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 13:06:40,747 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 13:06:40,751 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 13:06:40,797 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 13:06:40,797 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 13:06:40,801 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 13:06:40,802 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 13:06:40,812 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 13:06:40,816 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 13:06:40,817 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 13:06:40,818 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 13:06:40,819 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 13:06:40,820 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 13:06:40,821 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 13:06:40,823 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 13:06:40,827 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 13:06:40,828 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 13:06:40,829 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 13:06:40,833 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 13:06:40,835 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 13:06:40,836 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 13:06:40,839 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 13:06:40,840 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 13:06:40,841 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 13:06:40,846 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 13:06:40,846 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 13:06:40,847 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 13:06:40,847 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 13:06:40,848 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 13:06:40,849 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 13:06:40,849 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 13:06:40,850 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 13:06:40,850 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 13:06:40,851 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 13:06:40,852 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 13:06:40,852 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 13:06:40,853 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 13:06:40,853 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 13:06:40,853 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 13:06:40,854 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 13:06:40,855 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 13:06:40,855 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 13:06:40,877 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 13:06:40,877 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 13:06:40,879 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 13:06:40,879 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 13:06:40,879 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 13:06:40,879 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 13:06:40,879 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 13:06:40,880 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 13:06:40,880 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 13:06:40,880 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 13:06:40,880 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 13:06:40,880 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 13:06:40,881 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 13:06:40,881 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 13:06:40,881 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 13:06:40,881 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 13:06:40,881 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 13:06:40,882 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 13:06:40,882 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 13:06:40,882 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 13:06:40,882 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 13:06:40,882 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 13:06:40,883 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 13:06:40,883 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 13:06:40,883 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 13:06:40,883 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 13:06:40,883 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 13:06:40,883 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 13:06:40,884 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 13:06:40,884 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 13:06:41,155 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 13:06:41,167 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 13:06:41,170 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 13:06:41,172 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 13:06:41,172 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 13:06:41,173 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 13:06:41,244 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9b21600e6/be528589131b4f0181bcf2b1d6fdb01c/FLAG5241c3e68 [2020-08-18 13:06:41,987 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 13:06:41,990 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 13:06:42,021 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9b21600e6/be528589131b4f0181bcf2b1d6fdb01c/FLAG5241c3e68 [2020-08-18 13:06:42,091 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9b21600e6/be528589131b4f0181bcf2b1d6fdb01c [2020-08-18 13:06:42,099 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 13:06:42,101 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 13:06:42,104 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 13:06:42,104 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 13:06:42,108 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 13:06:42,109 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:06:42" (1/1) ... [2020-08-18 13:06:42,113 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@aae5b2a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:42, skipping insertion in model container [2020-08-18 13:06:42,113 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:06:42" (1/1) ... [2020-08-18 13:06:42,122 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 13:06:42,275 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 13:06:43,702 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 13:06:43,716 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 13:06:44,689 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 13:06:44,736 INFO L208 MainTranslator]: Completed translation [2020-08-18 13:06:44,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44 WrapperNode [2020-08-18 13:06:44,738 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 13:06:44,739 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 13:06:44,740 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 13:06:44,740 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 13:06:44,759 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44" (1/1) ... [2020-08-18 13:06:44,762 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44" (1/1) ... [2020-08-18 13:06:44,823 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44" (1/1) ... [2020-08-18 13:06:44,823 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44" (1/1) ... [2020-08-18 13:06:44,886 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44" (1/1) ... [2020-08-18 13:06:44,932 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44" (1/1) ... [2020-08-18 13:06:44,961 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44" (1/1) ... [2020-08-18 13:06:44,990 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 13:06:44,990 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 13:06:44,990 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 13:06:44,991 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 13:06:44,992 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44" (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 13:06:45,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 13:06:45,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 13:06:45,087 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 13:06:45,087 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 13:06:45,088 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 13:06:45,088 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 13:06:45,088 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-18 13:06:45,089 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 13:06:45,089 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-18 13:06:45,090 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 13:06:45,091 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 13:06:45,091 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-18 13:06:45,091 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-18 13:06:45,091 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-18 13:06:45,092 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-18 13:06:45,092 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-18 13:06:45,093 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-18 13:06:45,093 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-18 13:06:45,093 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 13:06:45,094 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 13:06:45,094 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 13:06:45,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 13:06:45,095 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 13:06:49,023 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 13:06:49,024 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 13:06:49,040 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:06:49 BoogieIcfgContainer [2020-08-18 13:06:49,040 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 13:06:49,042 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 13:06:49,042 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 13:06:49,046 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 13:06:49,046 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 01:06:42" (1/3) ... [2020-08-18 13:06:49,048 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3462a282 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:06:49, skipping insertion in model container [2020-08-18 13:06:49,048 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:44" (2/3) ... [2020-08-18 13:06:49,049 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3462a282 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:06:49, skipping insertion in model container [2020-08-18 13:06:49,049 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:06:49" (3/3) ... [2020-08-18 13:06:49,051 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 13:06:49,062 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 13:06:49,076 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 13:06:49,091 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 13:06:49,128 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 13:06:49,128 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 13:06:49,129 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 13:06:49,129 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 13:06:49,129 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 13:06:49,129 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 13:06:49,129 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 13:06:49,129 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 13:06:49,175 INFO L276 IsEmpty]: Start isEmpty. Operand 1340 states. [2020-08-18 13:06:49,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-08-18 13:06:49,219 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:06:49,221 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] [2020-08-18 13:06:49,222 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:06:49,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:06:49,229 INFO L82 PathProgramCache]: Analyzing trace with hash -866812329, now seen corresponding path program 1 times [2020-08-18 13:06:49,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:06:49,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412878883] [2020-08-18 13:06:49,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:06:50,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:06:51,773 WARN L193 SmtUtils]: Spent 840.00 ms on a formula simplification that was a NOOP. DAG size: 382 [2020-08-18 13:06:51,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:06:51,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:06:52,062 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 13:06:52,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412878883] [2020-08-18 13:06:52,064 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:06:52,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 13:06:52,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122127410] [2020-08-18 13:06:52,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 13:06:52,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:06:52,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 13:06:52,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 13:06:52,088 INFO L87 Difference]: Start difference. First operand 1340 states. Second operand 4 states. [2020-08-18 13:06:52,970 WARN L193 SmtUtils]: Spent 772.00 ms on a formula simplification that was a NOOP. DAG size: 383 [2020-08-18 13:07:02,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:07:02,769 INFO L93 Difference]: Finished difference Result 2262 states and 4032 transitions. [2020-08-18 13:07:02,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 13:07:02,771 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 476 [2020-08-18 13:07:02,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:07:02,814 INFO L225 Difference]: With dead ends: 2262 [2020-08-18 13:07:02,815 INFO L226 Difference]: Without dead ends: 1993 [2020-08-18 13:07:02,822 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 13:07:02,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1993 states. [2020-08-18 13:07:02,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1993 to 1991. [2020-08-18 13:07:02,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1991 states. [2020-08-18 13:07:02,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1991 states to 1991 states and 3230 transitions. [2020-08-18 13:07:02,975 INFO L78 Accepts]: Start accepts. Automaton has 1991 states and 3230 transitions. Word has length 476 [2020-08-18 13:07:02,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:07:02,977 INFO L479 AbstractCegarLoop]: Abstraction has 1991 states and 3230 transitions. [2020-08-18 13:07:02,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 13:07:02,977 INFO L276 IsEmpty]: Start isEmpty. Operand 1991 states and 3230 transitions. [2020-08-18 13:07:02,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-08-18 13:07:02,990 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:07:02,991 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] [2020-08-18 13:07:02,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 13:07:02,992 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:07:02,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:07:02,992 INFO L82 PathProgramCache]: Analyzing trace with hash 168046341, now seen corresponding path program 1 times [2020-08-18 13:07:02,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:07:02,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [277664294] [2020-08-18 13:07:02,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:07:04,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:07:05,934 WARN L193 SmtUtils]: Spent 1.43 s on a formula simplification that was a NOOP. DAG size: 382 [2020-08-18 13:07:05,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:07:05,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:07:06,454 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 13:07:06,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [277664294] [2020-08-18 13:07:06,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:07:06,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 13:07:06,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885101785] [2020-08-18 13:07:06,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 13:07:06,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:07:06,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 13:07:06,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 13:07:06,459 INFO L87 Difference]: Start difference. First operand 1991 states and 3230 transitions. Second operand 5 states. [2020-08-18 13:07:21,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:07:21,587 INFO L93 Difference]: Finished difference Result 5904 states and 9579 transitions. [2020-08-18 13:07:21,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 13:07:21,591 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 476 [2020-08-18 13:07:21,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:07:21,618 INFO L225 Difference]: With dead ends: 5904 [2020-08-18 13:07:21,619 INFO L226 Difference]: Without dead ends: 3930 [2020-08-18 13:07:21,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 13:07:21,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3930 states. [2020-08-18 13:07:21,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3930 to 3928. [2020-08-18 13:07:21,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3928 states. [2020-08-18 13:07:21,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3928 states to 3928 states and 6348 transitions. [2020-08-18 13:07:21,781 INFO L78 Accepts]: Start accepts. Automaton has 3928 states and 6348 transitions. Word has length 476 [2020-08-18 13:07:21,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:07:21,782 INFO L479 AbstractCegarLoop]: Abstraction has 3928 states and 6348 transitions. [2020-08-18 13:07:21,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 13:07:21,783 INFO L276 IsEmpty]: Start isEmpty. Operand 3928 states and 6348 transitions. [2020-08-18 13:07:21,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-08-18 13:07:21,793 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:07:21,793 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] [2020-08-18 13:07:21,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 13:07:21,794 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:07:21,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:07:21,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1082038238, now seen corresponding path program 1 times [2020-08-18 13:07:21,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:07:21,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974004395] [2020-08-18 13:07:21,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:07:22,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:07:23,497 WARN L193 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 382 [2020-08-18 13:07:23,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:07:23,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:07:23,943 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 13:07:23,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974004395] [2020-08-18 13:07:23,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:07:23,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 13:07:23,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149879796] [2020-08-18 13:07:23,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 13:07:23,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:07:23,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 13:07:23,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 13:07:23,946 INFO L87 Difference]: Start difference. First operand 3928 states and 6348 transitions. Second operand 4 states.