/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:58:33,617 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:58:33,619 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:58:33,643 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:58:33,643 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:58:33,644 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:58:33,645 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:58:33,647 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:58:33,648 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:58:33,649 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:58:33,650 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:58:33,651 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:58:33,651 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:58:33,652 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:58:33,653 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:58:33,655 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:58:33,655 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:58:33,656 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:58:33,658 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:58:33,660 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:58:33,661 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:58:33,662 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:58:33,663 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:58:33,664 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:58:33,666 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 06:58:33,667 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 06:58:33,667 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 06:58:33,668 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 06:58:33,668 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 06:58:33,669 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-19 06:58:33,669 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-19 06:58:33,670 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-19 06:58:33,671 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-19 06:58:33,674 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-19 06:58:33,675 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-19 06:58:33,675 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-19 06:58:33,676 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-19 06:58:33,676 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-19 06:58:33,677 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:58:33,677 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:58:33,678 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:58:33,679 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 [2020-08-19 06:58:33,701 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:58:33,701 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:58:33,702 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:58:33,703 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:58:33,703 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:58:33,703 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:58:33,703 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:58:33,704 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:58:33,704 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:58:33,704 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:58:33,704 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:58:33,704 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:58:33,704 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:58:33,705 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:58:33,705 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:58:33,705 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:58:33,705 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:58:33,705 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:58:33,706 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:58:33,706 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:58:33,706 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:58:33,706 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:58:33,706 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:58:33,707 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:58:33,707 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:58:33,707 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:58:33,707 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:58:33,707 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:58:33,707 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:58:33,708 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=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; [2020-08-19 06:58:34,010 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:58:34,028 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:58:34,034 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:58:34,036 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:58:34,037 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:58:34,038 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-19 06:58:34,098 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a13987a13/14bdd41018c04b8bb6f9acb028f1acd2/FLAGfdc0d73a5 [2020-08-19 06:58:34,876 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:58:34,876 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-19 06:58:34,924 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a13987a13/14bdd41018c04b8bb6f9acb028f1acd2/FLAGfdc0d73a5 [2020-08-19 06:58:35,004 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a13987a13/14bdd41018c04b8bb6f9acb028f1acd2 [2020-08-19 06:58:35,015 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:58:35,017 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:58:35,020 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:58:35,020 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:58:35,024 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:58:35,025 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:58:35" (1/1) ... [2020-08-19 06:58:35,029 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@daf34a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:35, skipping insertion in model container [2020-08-19 06:58:35,029 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:58:35" (1/1) ... [2020-08-19 06:58:35,039 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:58:35,222 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:58:36,702 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:58:36,715 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:58:37,628 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:58:37,677 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:58:37,677 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37 WrapperNode [2020-08-19 06:58:37,678 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:58:37,678 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:58:37,679 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:58:37,679 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:58:37,695 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37" (1/1) ... [2020-08-19 06:58:37,698 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37" (1/1) ... [2020-08-19 06:58:37,752 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37" (1/1) ... [2020-08-19 06:58:37,753 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37" (1/1) ... [2020-08-19 06:58:37,834 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37" (1/1) ... [2020-08-19 06:58:37,871 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37" (1/1) ... [2020-08-19 06:58:37,882 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37" (1/1) ... [2020-08-19 06:58:37,898 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:58:37,899 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:58:37,899 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:58:37,899 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:58:37,900 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37" (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 [2020-08-19 06:58:37,982 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:58:37,982 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:58:37,983 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 06:58:37,984 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:58:37,984 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:58:37,984 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-19 06:58:37,986 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-19 06:58:37,986 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-19 06:58:37,986 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 06:58:37,988 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 06:58:37,988 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-19 06:58:37,989 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-19 06:58:37,989 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-19 06:58:37,989 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-19 06:58:37,990 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-19 06:58:37,991 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-19 06:58:37,991 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-19 06:58:37,992 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-19 06:58:37,992 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-19 06:58:37,993 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:58:37,993 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:58:37,993 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:58:41,838 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:58:41,838 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-19 06:58:41,854 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:58:41 BoogieIcfgContainer [2020-08-19 06:58:41,854 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:58:41,858 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:58:41,858 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:58:41,861 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:58:41,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:58:35" (1/3) ... [2020-08-19 06:58:41,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9d33065 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:58:41, skipping insertion in model container [2020-08-19 06:58:41,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:58:37" (2/3) ... [2020-08-19 06:58:41,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9d33065 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:58:41, skipping insertion in model container [2020-08-19 06:58:41,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:58:41" (3/3) ... [2020-08-19 06:58:41,866 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-19 06:58:41,877 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:58:41,890 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:58:41,904 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:58:41,934 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:58:41,935 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:58:41,935 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:58:41,935 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:58:41,935 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:58:41,935 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:58:41,935 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:58:41,936 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:58:41,978 INFO L276 IsEmpty]: Start isEmpty. Operand 1322 states. [2020-08-19 06:58:42,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-19 06:58:42,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:58:42,033 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] [2020-08-19 06:58:42,033 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:58:42,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:58:42,040 INFO L82 PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times [2020-08-19 06:58:42,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:58:42,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2136034721] [2020-08-19 06:58:42,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:58:43,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:58:44,504 WARN L193 SmtUtils]: Spent 824.00 ms on a formula simplification that was a NOOP. DAG size: 388 [2020-08-19 06:58:44,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:58:44,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:58:44,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:58:44,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2136034721] [2020-08-19 06:58:44,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:58:44,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 06:58:44,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128250726] [2020-08-19 06:58:44,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:58:44,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:58:44,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:58:44,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:58:44,787 INFO L87 Difference]: Start difference. First operand 1322 states. Second operand 4 states. [2020-08-19 06:58:45,599 WARN L193 SmtUtils]: Spent 720.00 ms on a formula simplification that was a NOOP. DAG size: 389 [2020-08-19 06:58:54,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:58:54,749 INFO L93 Difference]: Finished difference Result 2212 states and 3947 transitions. [2020-08-19 06:58:54,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:58:54,752 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 467 [2020-08-19 06:58:54,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:58:54,789 INFO L225 Difference]: With dead ends: 2212 [2020-08-19 06:58:54,789 INFO L226 Difference]: Without dead ends: 1956 [2020-08-19 06:58:54,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:58:54,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1956 states. [2020-08-19 06:58:54,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1956 to 1954. [2020-08-19 06:58:54,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1954 states. [2020-08-19 06:58:54,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1954 states to 1954 states and 3183 transitions. [2020-08-19 06:58:54,969 INFO L78 Accepts]: Start accepts. Automaton has 1954 states and 3183 transitions. Word has length 467 [2020-08-19 06:58:54,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:58:54,972 INFO L479 AbstractCegarLoop]: Abstraction has 1954 states and 3183 transitions. [2020-08-19 06:58:54,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 06:58:54,972 INFO L276 IsEmpty]: Start isEmpty. Operand 1954 states and 3183 transitions. [2020-08-19 06:58:54,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-19 06:58:54,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:58:54,987 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] [2020-08-19 06:58:54,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:58:54,987 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:58:54,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:58:54,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1227921449, now seen corresponding path program 1 times [2020-08-19 06:58:54,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:58:54,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254409079] [2020-08-19 06:58:54,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:58:56,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:58:57,559 WARN L193 SmtUtils]: Spent 811.00 ms on a formula simplification that was a NOOP. DAG size: 388 [2020-08-19 06:58:57,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:58:57,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:58:57,904 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:58:57,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254409079] [2020-08-19 06:58:57,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:58:57,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:58:57,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780618793] [2020-08-19 06:58:57,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:58:57,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:58:57,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:58:57,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:58:57,908 INFO L87 Difference]: Start difference. First operand 1954 states and 3183 transitions. Second operand 5 states. [2020-08-19 06:59:12,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:59:12,154 INFO L93 Difference]: Finished difference Result 5793 states and 9438 transitions. [2020-08-19 06:59:12,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:59:12,155 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 467 [2020-08-19 06:59:12,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:59:12,176 INFO L225 Difference]: With dead ends: 5793 [2020-08-19 06:59:12,176 INFO L226 Difference]: Without dead ends: 3856 [2020-08-19 06:59:12,184 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:59:12,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3856 states. [2020-08-19 06:59:12,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3856 to 3854. [2020-08-19 06:59:12,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3854 states. [2020-08-19 06:59:12,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3854 states to 3854 states and 6254 transitions. [2020-08-19 06:59:12,342 INFO L78 Accepts]: Start accepts. Automaton has 3854 states and 6254 transitions. Word has length 467 [2020-08-19 06:59:12,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:59:12,343 INFO L479 AbstractCegarLoop]: Abstraction has 3854 states and 6254 transitions. [2020-08-19 06:59:12,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:59:12,344 INFO L276 IsEmpty]: Start isEmpty. Operand 3854 states and 6254 transitions. [2020-08-19 06:59:12,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-08-19 06:59:12,363 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:59:12,368 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] [2020-08-19 06:59:12,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:59:12,369 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:59:12,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:59:12,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1934187579, now seen corresponding path program 1 times [2020-08-19 06:59:12,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:59:12,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613628347] [2020-08-19 06:59:12,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:59:12,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:59:13,679 WARN L193 SmtUtils]: Spent 732.00 ms on a formula simplification that was a NOOP. DAG size: 388 [2020-08-19 06:59:13,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:59:13,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:59:13,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:59:13,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613628347] [2020-08-19 06:59:13,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:59:13,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 06:59:13,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902644383] [2020-08-19 06:59:13,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:59:13,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:59:13,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:59:13,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:59:13,960 INFO L87 Difference]: Start difference. First operand 3854 states and 6254 transitions. Second operand 4 states. [2020-08-19 06:59:30,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:59:30,437 INFO L93 Difference]: Finished difference Result 11260 states and 18231 transitions. [2020-08-19 06:59:30,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 06:59:30,438 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 469 [2020-08-19 06:59:30,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:59:30,475 INFO L225 Difference]: With dead ends: 11260 [2020-08-19 06:59:30,476 INFO L226 Difference]: Without dead ends: 7620 [2020-08-19 06:59:30,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:59:30,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7620 states. [2020-08-19 06:59:30,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7620 to 7618. [2020-08-19 06:59:30,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7618 states. [2020-08-19 06:59:30,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7618 states to 7618 states and 12321 transitions. [2020-08-19 06:59:30,785 INFO L78 Accepts]: Start accepts. Automaton has 7618 states and 12321 transitions. Word has length 469 [2020-08-19 06:59:30,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:59:30,785 INFO L479 AbstractCegarLoop]: Abstraction has 7618 states and 12321 transitions. [2020-08-19 06:59:30,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 06:59:30,786 INFO L276 IsEmpty]: Start isEmpty. Operand 7618 states and 12321 transitions. [2020-08-19 06:59:30,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-08-19 06:59:30,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:59:30,810 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] [2020-08-19 06:59:30,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:59:30,811 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:59:30,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:59:30,812 INFO L82 PathProgramCache]: Analyzing trace with hash -269242540, now seen corresponding path program 1 times [2020-08-19 06:59:30,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:59:30,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140710444] [2020-08-19 06:59:30,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:59:30,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:59:31,701 WARN L193 SmtUtils]: Spent 656.00 ms on a formula simplification that was a NOOP. DAG size: 388 [2020-08-19 06:59:31,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:59:31,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:59:31,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:59:31,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140710444] [2020-08-19 06:59:31,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:59:31,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 06:59:31,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553722185] [2020-08-19 06:59:31,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:59:31,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:59:31,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:59:31,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:59:31,934 INFO L87 Difference]: Start difference. First operand 7618 states and 12321 transitions. Second operand 4 states.