/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.2 --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 04:01:46,870 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 04:01:46,874 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 04:01:46,918 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 04:01:46,919 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 04:01:46,928 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 04:01:46,930 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 04:01:46,933 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 04:01:46,936 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 04:01:46,939 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 04:01:46,940 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 04:01:46,941 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 04:01:46,941 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 04:01:46,943 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 04:01:46,946 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 04:01:46,947 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 04:01:46,949 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 04:01:46,949 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 04:01:46,951 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 04:01:46,959 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 04:01:46,961 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 04:01:46,962 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 04:01:46,963 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 04:01:46,963 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 04:01:46,975 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 04:01:46,975 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 04:01:46,976 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 04:01:46,982 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 04:01:46,982 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 04:01:46,983 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-22 04:01:46,987 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 04:01:46,988 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 04:01:46,989 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 04:01:46,990 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 04:01:47,011 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 04:01:47,012 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 04:01:47,013 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 04:01:47,013 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 04:01:47,013 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 04:01:47,014 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 04:01:47,014 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 04:01:47,014 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 04:01:47,014 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 04:01:47,014 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 04:01:47,014 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 04:01:47,015 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 04:01:47,015 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 04:01:47,015 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 04:01:47,015 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 04:01:47,015 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 04:01:47,016 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 04:01:47,016 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 04:01:47,016 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 04:01:47,016 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 04:01:47,016 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 04:01:47,017 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 04:01:47,017 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 04:01:47,017 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 04:01:47,017 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 04:01:47,017 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 04:01:47,017 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 04:01:47,018 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 04:01:47,018 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 04:01:47,018 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=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; [2020-08-22 04:01:47,356 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 04:01:47,370 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 04:01:47,373 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 04:01:47,375 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 04:01:47,375 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 04:01:47,376 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 04:01:47,443 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/65aeb33f8/0e8367c1aff34afe8283e98017bf3e7c/FLAG2af900ccb [2020-08-22 04:01:48,134 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 04:01:48,135 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 04:01:48,166 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/65aeb33f8/0e8367c1aff34afe8283e98017bf3e7c/FLAG2af900ccb [2020-08-22 04:01:48,294 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/65aeb33f8/0e8367c1aff34afe8283e98017bf3e7c [2020-08-22 04:01:48,303 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 04:01:48,305 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 04:01:48,306 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 04:01:48,306 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 04:01:48,310 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 04:01:48,311 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:01:48" (1/1) ... [2020-08-22 04:01:48,314 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bbd1661 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:48, skipping insertion in model container [2020-08-22 04:01:48,314 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:01:48" (1/1) ... [2020-08-22 04:01:48,322 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 04:01:48,521 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 04:01:50,476 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:01:50,489 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 04:01:51,529 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 04:01:51,554 INFO L208 MainTranslator]: Completed translation [2020-08-22 04:01:51,555 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51 WrapperNode [2020-08-22 04:01:51,555 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 04:01:51,556 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 04:01:51,556 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 04:01:51,556 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 04:01:51,572 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51" (1/1) ... [2020-08-22 04:01:51,572 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51" (1/1) ... [2020-08-22 04:01:51,612 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51" (1/1) ... [2020-08-22 04:01:51,613 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51" (1/1) ... [2020-08-22 04:01:51,688 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51" (1/1) ... [2020-08-22 04:01:51,747 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51" (1/1) ... [2020-08-22 04:01:51,766 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51" (1/1) ... [2020-08-22 04:01:51,798 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 04:01:51,799 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 04:01:51,799 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 04:01:51,799 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 04:01:51,800 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51" (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 04:01:51,896 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 04:01:51,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 04:01:51,899 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 04:01:51,900 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 04:01:51,900 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 04:01:51,900 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 04:01:51,902 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-22 04:01:51,903 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-22 04:01:51,904 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 04:01:51,905 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 04:01:51,905 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-22 04:01:51,905 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-22 04:01:51,906 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-22 04:01:51,906 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-22 04:01:51,906 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-22 04:01:51,907 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-22 04:01:51,908 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-22 04:01:51,908 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-22 04:01:51,908 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-22 04:01:51,909 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 04:01:51,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 04:01:51,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 04:01:56,542 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 04:01:56,543 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 04:01:56,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:01:56 BoogieIcfgContainer [2020-08-22 04:01:56,560 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 04:01:56,563 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 04:01:56,564 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 04:01:56,567 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 04:01:56,567 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:01:48" (1/3) ... [2020-08-22 04:01:56,568 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@380f2db5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:01:56, skipping insertion in model container [2020-08-22 04:01:56,568 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:01:51" (2/3) ... [2020-08-22 04:01:56,569 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@380f2db5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:01:56, skipping insertion in model container [2020-08-22 04:01:56,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:01:56" (3/3) ... [2020-08-22 04:01:56,572 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-22 04:01:56,586 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 04:01:56,599 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-22 04:01:56,615 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-22 04:01:56,652 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 04:01:56,652 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 04:01:56,652 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 04:01:56,652 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 04:01:56,653 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 04:01:56,653 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 04:01:56,653 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 04:01:56,653 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 04:01:56,708 INFO L276 IsEmpty]: Start isEmpty. Operand 1484 states. [2020-08-22 04:01:56,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-08-22 04:01:56,759 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:01:56,761 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 04:01:56,761 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:01:56,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:01:56,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1064488228, now seen corresponding path program 1 times [2020-08-22 04:01:56,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:01:56,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244422553] [2020-08-22 04:01:56,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:01:58,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:02:00,272 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-22 04:02:00,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:02:00,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:02:00,669 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 04:02:00,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244422553] [2020-08-22 04:02:00,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:02:00,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 04:02:00,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120684938] [2020-08-22 04:02:00,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 04:02:00,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:02:00,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 04:02:00,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 04:02:00,693 INFO L87 Difference]: Start difference. First operand 1484 states. Second operand 5 states. [2020-08-22 04:02:18,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:02:18,287 INFO L93 Difference]: Finished difference Result 4394 states and 7936 transitions. [2020-08-22 04:02:18,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 04:02:18,290 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 484 [2020-08-22 04:02:18,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:02:18,333 INFO L225 Difference]: With dead ends: 4394 [2020-08-22 04:02:18,333 INFO L226 Difference]: Without dead ends: 2919 [2020-08-22 04:02:18,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 04:02:18,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2919 states. [2020-08-22 04:02:18,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2919 to 2865. [2020-08-22 04:02:18,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2865 states. [2020-08-22 04:02:18,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2865 states to 2865 states and 4721 transitions. [2020-08-22 04:02:18,557 INFO L78 Accepts]: Start accepts. Automaton has 2865 states and 4721 transitions. Word has length 484 [2020-08-22 04:02:18,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:02:18,559 INFO L479 AbstractCegarLoop]: Abstraction has 2865 states and 4721 transitions. [2020-08-22 04:02:18,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 04:02:18,559 INFO L276 IsEmpty]: Start isEmpty. Operand 2865 states and 4721 transitions. [2020-08-22 04:02:18,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-08-22 04:02:18,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:02:18,576 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 04:02:18,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 04:02:18,577 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:02:18,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:02:18,578 INFO L82 PathProgramCache]: Analyzing trace with hash 1721765960, now seen corresponding path program 1 times [2020-08-22 04:02:18,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:02:18,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133872214] [2020-08-22 04:02:18,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:02:18,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:02:20,989 WARN L193 SmtUtils]: Spent 1.60 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-22 04:02:20,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:02:21,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:02:21,371 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 04:02:21,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133872214] [2020-08-22 04:02:21,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:02:21,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 04:02:21,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615030771] [2020-08-22 04:02:21,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 04:02:21,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:02:21,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 04:02:21,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:02:21,375 INFO L87 Difference]: Start difference. First operand 2865 states and 4721 transitions. Second operand 4 states. [2020-08-22 04:02:43,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 04:02:43,416 INFO L93 Difference]: Finished difference Result 8316 states and 13666 transitions. [2020-08-22 04:02:43,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 04:02:43,417 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 486 [2020-08-22 04:02:43,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 04:02:43,449 INFO L225 Difference]: With dead ends: 8316 [2020-08-22 04:02:43,450 INFO L226 Difference]: Without dead ends: 5665 [2020-08-22 04:02:43,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:02:43,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5665 states. [2020-08-22 04:02:43,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5665 to 5613. [2020-08-22 04:02:43,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5613 states. [2020-08-22 04:02:43,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5613 states to 5613 states and 9225 transitions. [2020-08-22 04:02:43,725 INFO L78 Accepts]: Start accepts. Automaton has 5613 states and 9225 transitions. Word has length 486 [2020-08-22 04:02:43,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 04:02:43,728 INFO L479 AbstractCegarLoop]: Abstraction has 5613 states and 9225 transitions. [2020-08-22 04:02:43,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 04:02:43,728 INFO L276 IsEmpty]: Start isEmpty. Operand 5613 states and 9225 transitions. [2020-08-22 04:02:43,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-08-22 04:02:43,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 04:02:43,753 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 04:02:43,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 04:02:43,755 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 04:02:43,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 04:02:43,756 INFO L82 PathProgramCache]: Analyzing trace with hash 326918239, now seen corresponding path program 1 times [2020-08-22 04:02:43,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 04:02:43,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799031774] [2020-08-22 04:02:43,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 04:02:43,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:02:45,161 WARN L193 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 406 [2020-08-22 04:02:45,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 04:02:45,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 04:02:45,367 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 04:02:45,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799031774] [2020-08-22 04:02:45,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 04:02:45,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 04:02:45,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369030203] [2020-08-22 04:02:45,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 04:02:45,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 04:02:45,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 04:02:45,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 04:02:45,382 INFO L87 Difference]: Start difference. First operand 5613 states and 9225 transitions. Second operand 4 states.