/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=1.0 --traceabstraction.additional.smt.options log-additional-information=true -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 0.1.25-177f698 [2020-08-22 02:24:43,091 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 02:24:43,094 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 02:24:43,139 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 02:24:43,143 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 02:24:43,144 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 02:24:43,145 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 02:24:43,149 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 02:24:43,153 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 02:24:43,157 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 02:24:43,158 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 02:24:43,159 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 02:24:43,159 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 02:24:43,160 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 02:24:43,161 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 02:24:43,162 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 02:24:43,163 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 02:24:43,164 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 02:24:43,165 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 02:24:43,167 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 02:24:43,168 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 02:24:43,169 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 02:24:43,170 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 02:24:43,171 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 02:24:43,174 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 02:24:43,174 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 02:24:43,174 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 02:24:43,175 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 02:24:43,175 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 02:24:43,176 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 02:24:43,176 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 02:24:43,177 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 02:24:43,178 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 02:24:43,178 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 02:24:43,179 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 02:24:43,180 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 02:24:43,180 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 02:24:43,180 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 02:24:43,181 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 02:24:43,181 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 02:24:43,182 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 02:24:43,183 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 [2020-08-22 02:24:43,204 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 02:24:43,205 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 02:24:43,206 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 02:24:43,206 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 02:24:43,206 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 02:24:43,207 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 02:24:43,207 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 02:24:43,207 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 02:24:43,207 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 02:24:43,207 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 02:24:43,208 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 02:24:43,208 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 02:24:43,208 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 02:24:43,208 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 02:24:43,208 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 02:24:43,208 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 02:24:43,209 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 02:24:43,209 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 02:24:43,209 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 02:24:43,209 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 02:24:43,210 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 02:24:43,210 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 02:24:43,210 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 02:24:43,210 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 02:24:43,210 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 02:24:43,211 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 02:24:43,211 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 02:24:43,211 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 02:24:43,211 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 02:24:43,211 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=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; [2020-08-22 02:24:43,516 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 02:24:43,528 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 02:24:43,532 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 02:24:43,534 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 02:24:43,534 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 02:24:43,535 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 02:24:43,612 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d487e3fe4/3399dfcdbbdd41c582653cb2949f83f6/FLAGa15ff2726 [2020-08-22 02:24:44,359 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 02:24:44,360 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 02:24:44,391 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d487e3fe4/3399dfcdbbdd41c582653cb2949f83f6/FLAGa15ff2726 [2020-08-22 02:24:44,472 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d487e3fe4/3399dfcdbbdd41c582653cb2949f83f6 [2020-08-22 02:24:44,487 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 02:24:44,489 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 02:24:44,491 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 02:24:44,491 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 02:24:44,495 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 02:24:44,496 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 02:24:44" (1/1) ... [2020-08-22 02:24:44,501 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ee4d01a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:44, skipping insertion in model container [2020-08-22 02:24:44,501 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 02:24:44" (1/1) ... [2020-08-22 02:24:44,511 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 02:24:44,715 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 02:24:46,380 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 02:24:46,394 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 02:24:47,856 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 02:24:47,895 INFO L208 MainTranslator]: Completed translation [2020-08-22 02:24:47,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47 WrapperNode [2020-08-22 02:24:47,897 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 02:24:47,898 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 02:24:47,898 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 02:24:47,898 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 02:24:47,913 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47" (1/1) ... [2020-08-22 02:24:47,915 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47" (1/1) ... [2020-08-22 02:24:47,971 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47" (1/1) ... [2020-08-22 02:24:47,972 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47" (1/1) ... [2020-08-22 02:24:48,035 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47" (1/1) ... [2020-08-22 02:24:48,076 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47" (1/1) ... [2020-08-22 02:24:48,093 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47" (1/1) ... [2020-08-22 02:24:48,119 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 02:24:48,120 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 02:24:48,121 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 02:24:48,121 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 02:24:48,123 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47" (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 [2020-08-22 02:24:48,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 02:24:48,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 02:24:48,211 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 02:24:48,211 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 02:24:48,211 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 02:24:48,212 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 02:24:48,212 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-22 02:24:48,213 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-22 02:24:48,213 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 02:24:48,214 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 02:24:48,214 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-22 02:24:48,214 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-22 02:24:48,214 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-22 02:24:48,215 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-22 02:24:48,215 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-22 02:24:48,216 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-22 02:24:48,216 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-22 02:24:48,216 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-22 02:24:48,216 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-22 02:24:48,217 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 02:24:48,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 02:24:48,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 02:24:52,439 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 02:24:52,439 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 02:24:52,462 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 02:24:52 BoogieIcfgContainer [2020-08-22 02:24:52,462 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 02:24:52,468 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 02:24:52,469 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 02:24:52,473 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 02:24:52,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 02:24:44" (1/3) ... [2020-08-22 02:24:52,476 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d553588 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 02:24:52, skipping insertion in model container [2020-08-22 02:24:52,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:24:47" (2/3) ... [2020-08-22 02:24:52,477 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d553588 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 02:24:52, skipping insertion in model container [2020-08-22 02:24:52,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 02:24:52" (3/3) ... [2020-08-22 02:24:52,480 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 02:24:52,497 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 02:24:52,512 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-22 02:24:52,533 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-22 02:24:52,582 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 02:24:52,583 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 02:24:52,583 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 02:24:52,583 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 02:24:52,583 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 02:24:52,584 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 02:24:52,584 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 02:24:52,584 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 02:24:52,644 INFO L276 IsEmpty]: Start isEmpty. Operand 1484 states. [2020-08-22 02:24:52,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-08-22 02:24:52,712 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:24:52,715 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] [2020-08-22 02:24:52,716 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:24:52,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:24:52,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1064488228, now seen corresponding path program 1 times [2020-08-22 02:24:52,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:24:52,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941027419] [2020-08-22 02:24:52,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:24:54,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:24:56,459 WARN L193 SmtUtils]: Spent 959.00 ms on a formula simplification that was a NOOP. DAG size: 406 [2020-08-22 02:24:56,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:24:56,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:24:56,819 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:24:56,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941027419] [2020-08-22 02:24:56,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:24:56,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 02:24:56,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795983441] [2020-08-22 02:24:56,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 02:24:56,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:24:56,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 02:24:56,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 02:24:56,844 INFO L87 Difference]: Start difference. First operand 1484 states. Second operand 5 states. [2020-08-22 02:25:13,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:25:13,956 INFO L93 Difference]: Finished difference Result 4394 states and 7936 transitions. [2020-08-22 02:25:13,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 02:25:13,960 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 484 [2020-08-22 02:25:13,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:25:14,013 INFO L225 Difference]: With dead ends: 4394 [2020-08-22 02:25:14,013 INFO L226 Difference]: Without dead ends: 2919 [2020-08-22 02:25:14,025 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 [2020-08-22 02:25:14,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2919 states. [2020-08-22 02:25:14,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2919 to 2865. [2020-08-22 02:25:14,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2865 states. [2020-08-22 02:25:14,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2865 states to 2865 states and 4721 transitions. [2020-08-22 02:25:14,238 INFO L78 Accepts]: Start accepts. Automaton has 2865 states and 4721 transitions. Word has length 484 [2020-08-22 02:25:14,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:25:14,239 INFO L479 AbstractCegarLoop]: Abstraction has 2865 states and 4721 transitions. [2020-08-22 02:25:14,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 02:25:14,240 INFO L276 IsEmpty]: Start isEmpty. Operand 2865 states and 4721 transitions. [2020-08-22 02:25:14,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-08-22 02:25:14,254 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:25:14,255 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] [2020-08-22 02:25:14,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 02:25:14,255 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:25:14,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:25:14,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1721765960, now seen corresponding path program 1 times [2020-08-22 02:25:14,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:25:14,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462870303] [2020-08-22 02:25:14,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:25:14,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:25:16,112 WARN L193 SmtUtils]: Spent 1.34 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-22 02:25:16,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:25:16,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:25:16,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:25:16,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462870303] [2020-08-22 02:25:16,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:25:16,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 02:25:16,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016405755] [2020-08-22 02:25:16,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 02:25:16,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:25:16,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 02:25:16,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 02:25:16,557 INFO L87 Difference]: Start difference. First operand 2865 states and 4721 transitions. Second operand 4 states. [2020-08-22 02:25:37,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:25:37,672 INFO L93 Difference]: Finished difference Result 8316 states and 13666 transitions. [2020-08-22 02:25:37,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 02:25:37,673 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 486 [2020-08-22 02:25:37,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:25:37,702 INFO L225 Difference]: With dead ends: 8316 [2020-08-22 02:25:37,703 INFO L226 Difference]: Without dead ends: 5665 [2020-08-22 02:25:37,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 02:25:37,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5665 states. [2020-08-22 02:25:37,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5665 to 5613. [2020-08-22 02:25:37,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5613 states. [2020-08-22 02:25:37,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5613 states to 5613 states and 9225 transitions. [2020-08-22 02:25:37,921 INFO L78 Accepts]: Start accepts. Automaton has 5613 states and 9225 transitions. Word has length 486 [2020-08-22 02:25:37,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:25:37,923 INFO L479 AbstractCegarLoop]: Abstraction has 5613 states and 9225 transitions. [2020-08-22 02:25:37,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 02:25:37,924 INFO L276 IsEmpty]: Start isEmpty. Operand 5613 states and 9225 transitions. [2020-08-22 02:25:37,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-08-22 02:25:37,950 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:25:37,955 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] [2020-08-22 02:25:37,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 02:25:37,956 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:25:37,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:25:37,957 INFO L82 PathProgramCache]: Analyzing trace with hash 326918239, now seen corresponding path program 1 times [2020-08-22 02:25:37,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:25:37,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1444899085] [2020-08-22 02:25:37,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:25:38,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:25:39,113 WARN L193 SmtUtils]: Spent 933.00 ms on a formula simplification that was a NOOP. DAG size: 406 [2020-08-22 02:25:39,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:25:39,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:25:39,308 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:25:39,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1444899085] [2020-08-22 02:25:39,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:25:39,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 02:25:39,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844541842] [2020-08-22 02:25:39,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 02:25:39,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:25:39,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 02:25:39,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 02:25:39,322 INFO L87 Difference]: Start difference. First operand 5613 states and 9225 transitions. Second operand 4 states.