/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 10:42:29,547 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 10:42:29,551 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 10:42:29,594 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 10:42:29,595 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 10:42:29,604 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 10:42:29,608 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 10:42:29,612 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 10:42:29,615 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 10:42:29,619 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 10:42:29,621 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 10:42:29,623 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 10:42:29,623 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 10:42:29,626 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 10:42:29,628 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 10:42:29,630 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 10:42:29,632 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 10:42:29,633 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 10:42:29,634 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 10:42:29,642 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 10:42:29,645 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 10:42:29,646 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 10:42:29,647 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 10:42:29,647 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 10:42:29,659 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 10:42:29,660 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 10:42:29,660 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 10:42:29,661 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 10:42:29,665 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 10:42:29,666 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 10:42:29,666 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 10:42:29,670 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 10:42:29,671 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 10:42:29,671 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 10:42:29,675 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 10:42:29,675 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 10:42:29,676 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 10:42:29,678 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 10:42:29,678 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 10:42:29,679 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 10:42:29,680 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 10:42:29,684 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 10:42:29,722 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 10:42:29,722 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 10:42:29,723 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 10:42:29,724 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 10:42:29,724 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 10:42:29,724 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 10:42:29,724 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 10:42:29,724 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 10:42:29,725 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 10:42:29,725 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 10:42:29,725 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 10:42:29,725 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 10:42:29,725 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 10:42:29,726 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 10:42:29,726 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 10:42:29,726 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 10:42:29,726 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 10:42:29,726 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 10:42:29,727 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 10:42:29,727 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 10:42:29,727 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 10:42:29,727 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 10:42:29,727 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 10:42:29,728 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 10:42:29,728 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 10:42:29,728 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 10:42:29,728 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 10:42:29,728 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 10:42:29,729 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 10:42:29,729 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 -> false [2020-08-18 10:42:30,075 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 10:42:30,093 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 10:42:30,105 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 10:42:30,106 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 10:42:30,107 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 10:42:30,108 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 10:42:30,167 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d01f0b16a/29c403d3d6a243c48b9c0d60b442f330/FLAGd478cff47 [2020-08-18 10:42:30,822 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 10:42:30,823 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 10:42:30,848 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d01f0b16a/29c403d3d6a243c48b9c0d60b442f330/FLAGd478cff47 [2020-08-18 10:42:30,983 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d01f0b16a/29c403d3d6a243c48b9c0d60b442f330 [2020-08-18 10:42:30,991 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 10:42:30,992 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 10:42:30,993 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 10:42:30,993 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 10:42:30,997 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 10:42:30,998 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:42:30" (1/1) ... [2020-08-18 10:42:31,001 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57f9529c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:30, skipping insertion in model container [2020-08-18 10:42:31,001 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:42:30" (1/1) ... [2020-08-18 10:42:31,009 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 10:42:31,132 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 10:42:32,255 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 10:42:32,268 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 10:42:32,791 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 10:42:32,828 INFO L208 MainTranslator]: Completed translation [2020-08-18 10:42:32,829 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32 WrapperNode [2020-08-18 10:42:32,829 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 10:42:32,830 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 10:42:32,830 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 10:42:32,830 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 10:42:32,852 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32" (1/1) ... [2020-08-18 10:42:32,854 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32" (1/1) ... [2020-08-18 10:42:32,916 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32" (1/1) ... [2020-08-18 10:42:32,916 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32" (1/1) ... [2020-08-18 10:42:32,988 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32" (1/1) ... [2020-08-18 10:42:33,023 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32" (1/1) ... [2020-08-18 10:42:33,034 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32" (1/1) ... [2020-08-18 10:42:33,051 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 10:42:33,055 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 10:42:33,055 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 10:42:33,055 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 10:42:33,058 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 10:42:33,156 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 10:42:33,157 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 10:42:33,157 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 10:42:33,157 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 10:42:33,157 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 10:42:33,158 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 10:42:33,158 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-18 10:42:33,159 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 10:42:33,160 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-18 10:42:33,160 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 10:42:33,160 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 10:42:33,161 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-18 10:42:33,161 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-18 10:42:33,162 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-18 10:42:33,162 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-18 10:42:33,163 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-18 10:42:33,164 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-18 10:42:33,164 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 10:42:33,164 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 10:42:33,165 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 10:42:33,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 10:42:33,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 10:42:35,699 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 10:42:35,699 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 10:42:35,709 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:42:35 BoogieIcfgContainer [2020-08-18 10:42:35,709 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 10:42:35,711 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 10:42:35,711 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 10:42:35,714 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 10:42:35,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:42:30" (1/3) ... [2020-08-18 10:42:35,716 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d5ab9a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:42:35, skipping insertion in model container [2020-08-18 10:42:35,716 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:32" (2/3) ... [2020-08-18 10:42:35,716 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d5ab9a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:42:35, skipping insertion in model container [2020-08-18 10:42:35,716 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:42:35" (3/3) ... [2020-08-18 10:42:35,718 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 10:42:35,756 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 10:42:35,766 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 10:42:35,782 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 10:42:35,816 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 10:42:35,817 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 10:42:35,817 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 10:42:35,817 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 10:42:35,817 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 10:42:35,817 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 10:42:35,817 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 10:42:35,818 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 10:42:35,862 INFO L276 IsEmpty]: Start isEmpty. Operand 808 states. [2020-08-18 10:42:35,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-08-18 10:42:35,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:42:35,908 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] [2020-08-18 10:42:35,908 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:42:35,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:42:35,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1078138388, now seen corresponding path program 1 times [2020-08-18 10:42:35,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:42:35,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195601947] [2020-08-18 10:42:35,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:42:36,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:37,564 WARN L193 SmtUtils]: Spent 476.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:42:37,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:42:37,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:37,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:42:37,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195601947] [2020-08-18 10:42:37,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:42:37,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:42:37,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987534459] [2020-08-18 10:42:37,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:42:37,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:42:37,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:42:37,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:42:37,840 INFO L87 Difference]: Start difference. First operand 808 states. Second operand 4 states. [2020-08-18 10:42:38,336 WARN L193 SmtUtils]: Spent 428.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-18 10:42:43,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:42:43,303 INFO L93 Difference]: Finished difference Result 1527 states and 2683 transitions. [2020-08-18 10:42:43,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 10:42:43,306 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-08-18 10:42:43,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:42:43,386 INFO L225 Difference]: With dead ends: 1527 [2020-08-18 10:42:43,386 INFO L226 Difference]: Without dead ends: 1311 [2020-08-18 10:42:43,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 10:42:43,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1311 states. [2020-08-18 10:42:43,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1311 to 1309. [2020-08-18 10:42:43,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1309 states. [2020-08-18 10:42:43,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1309 states to 1309 states and 2040 transitions. [2020-08-18 10:42:43,574 INFO L78 Accepts]: Start accepts. Automaton has 1309 states and 2040 transitions. Word has length 330 [2020-08-18 10:42:43,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:42:43,579 INFO L479 AbstractCegarLoop]: Abstraction has 1309 states and 2040 transitions. [2020-08-18 10:42:43,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:42:43,579 INFO L276 IsEmpty]: Start isEmpty. Operand 1309 states and 2040 transitions. [2020-08-18 10:42:43,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-08-18 10:42:43,591 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:42:43,592 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] [2020-08-18 10:42:43,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 10:42:43,593 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:42:43,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:42:43,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1867298226, now seen corresponding path program 1 times [2020-08-18 10:42:43,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:42:43,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498803020] [2020-08-18 10:42:43,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:42:43,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:44,657 WARN L193 SmtUtils]: Spent 549.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:42:44,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:42:44,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:45,015 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:42:45,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498803020] [2020-08-18 10:42:45,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:42:45,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:42:45,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094466063] [2020-08-18 10:42:45,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:42:45,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:42:45,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:42:45,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:42:45,024 INFO L87 Difference]: Start difference. First operand 1309 states and 2040 transitions. Second operand 4 states. [2020-08-18 10:42:45,455 WARN L193 SmtUtils]: Spent 372.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-18 10:42:49,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:42:49,752 INFO L93 Difference]: Finished difference Result 2683 states and 4213 transitions. [2020-08-18 10:42:49,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 10:42:49,753 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-08-18 10:42:49,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:42:49,770 INFO L225 Difference]: With dead ends: 2683 [2020-08-18 10:42:49,771 INFO L226 Difference]: Without dead ends: 2301 [2020-08-18 10:42:49,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 10:42:49,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2301 states. [2020-08-18 10:42:49,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2301 to 2299. [2020-08-18 10:42:49,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2299 states. [2020-08-18 10:42:49,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2299 states to 2299 states and 3576 transitions. [2020-08-18 10:42:49,895 INFO L78 Accepts]: Start accepts. Automaton has 2299 states and 3576 transitions. Word has length 330 [2020-08-18 10:42:49,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:42:49,897 INFO L479 AbstractCegarLoop]: Abstraction has 2299 states and 3576 transitions. [2020-08-18 10:42:49,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:42:49,897 INFO L276 IsEmpty]: Start isEmpty. Operand 2299 states and 3576 transitions. [2020-08-18 10:42:49,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-08-18 10:42:49,912 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:42:49,914 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] [2020-08-18 10:42:49,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 10:42:49,924 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:42:49,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:42:49,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1297523319, now seen corresponding path program 1 times [2020-08-18 10:42:49,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:42:49,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [427054864] [2020-08-18 10:42:49,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:42:50,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:50,849 WARN L193 SmtUtils]: Spent 368.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:42:50,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:42:50,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:51,080 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:42:51,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [427054864] [2020-08-18 10:42:51,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:42:51,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:42:51,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974159575] [2020-08-18 10:42:51,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:42:51,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:42:51,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:42:51,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:42:51,085 INFO L87 Difference]: Start difference. First operand 2299 states and 3576 transitions. Second operand 4 states. [2020-08-18 10:42:51,486 WARN L193 SmtUtils]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-18 10:42:55,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:42:55,475 INFO L93 Difference]: Finished difference Result 4867 states and 7634 transitions. [2020-08-18 10:42:55,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 10:42:55,475 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-08-18 10:42:55,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:42:55,497 INFO L225 Difference]: With dead ends: 4867 [2020-08-18 10:42:55,498 INFO L226 Difference]: Without dead ends: 4201 [2020-08-18 10:42:55,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 10:42:55,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4201 states. [2020-08-18 10:42:55,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4201 to 4199. [2020-08-18 10:42:55,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4199 states. [2020-08-18 10:42:55,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4199 states to 4199 states and 6516 transitions. [2020-08-18 10:42:55,682 INFO L78 Accepts]: Start accepts. Automaton has 4199 states and 6516 transitions. Word has length 330 [2020-08-18 10:42:55,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:42:55,683 INFO L479 AbstractCegarLoop]: Abstraction has 4199 states and 6516 transitions. [2020-08-18 10:42:55,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:42:55,683 INFO L276 IsEmpty]: Start isEmpty. Operand 4199 states and 6516 transitions. [2020-08-18 10:42:55,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-08-18 10:42:55,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:42:55,694 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] [2020-08-18 10:42:55,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 10:42:55,695 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:42:55,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:42:55,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1852614154, now seen corresponding path program 1 times [2020-08-18 10:42:55,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:42:55,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098154402] [2020-08-18 10:42:55,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:42:56,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:56,636 WARN L193 SmtUtils]: Spent 391.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:42:56,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:42:56,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:56,801 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:42:56,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098154402] [2020-08-18 10:42:56,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:42:56,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 10:42:56,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967674558] [2020-08-18 10:42:56,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 10:42:56,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:42:56,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 10:42:56,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 10:42:56,804 INFO L87 Difference]: Start difference. First operand 4199 states and 6516 transitions. Second operand 5 states. [2020-08-18 10:43:03,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:43:03,595 INFO L93 Difference]: Finished difference Result 12414 states and 19245 transitions. [2020-08-18 10:43:03,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 10:43:03,596 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 330 [2020-08-18 10:43:03,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:43:03,634 INFO L225 Difference]: With dead ends: 12414 [2020-08-18 10:43:03,634 INFO L226 Difference]: Without dead ends: 8230 [2020-08-18 10:43:03,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 10:43:03,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8230 states. [2020-08-18 10:43:03,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8230 to 8228. [2020-08-18 10:43:03,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8228 states. [2020-08-18 10:43:03,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8228 states to 8228 states and 12694 transitions. [2020-08-18 10:43:03,997 INFO L78 Accepts]: Start accepts. Automaton has 8228 states and 12694 transitions. Word has length 330 [2020-08-18 10:43:03,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:43:03,998 INFO L479 AbstractCegarLoop]: Abstraction has 8228 states and 12694 transitions. [2020-08-18 10:43:03,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 10:43:03,998 INFO L276 IsEmpty]: Start isEmpty. Operand 8228 states and 12694 transitions. [2020-08-18 10:43:04,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-08-18 10:43:04,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:43:04,073 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] [2020-08-18 10:43:04,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 10:43:04,073 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:43:04,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:43:04,074 INFO L82 PathProgramCache]: Analyzing trace with hash 569689837, now seen corresponding path program 1 times [2020-08-18 10:43:04,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:43:04,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [757846977] [2020-08-18 10:43:04,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:43:04,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:04,669 WARN L193 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:43:04,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:43:04,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:04,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:43:04,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [757846977] [2020-08-18 10:43:04,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:43:04,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:43:04,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460149732] [2020-08-18 10:43:04,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:43:04,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:43:04,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:43:04,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:04,792 INFO L87 Difference]: Start difference. First operand 8228 states and 12694 transitions. Second operand 4 states. [2020-08-18 10:43:12,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:43:12,406 INFO L93 Difference]: Finished difference Result 24233 states and 37318 transitions. [2020-08-18 10:43:12,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 10:43:12,407 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 332 [2020-08-18 10:43:12,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:43:12,465 INFO L225 Difference]: With dead ends: 24233 [2020-08-18 10:43:12,465 INFO L226 Difference]: Without dead ends: 16134 [2020-08-18 10:43:12,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:12,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16134 states. [2020-08-18 10:43:13,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16134 to 16132. [2020-08-18 10:43:13,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16132 states. [2020-08-18 10:43:13,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16132 states to 16132 states and 24741 transitions. [2020-08-18 10:43:13,067 INFO L78 Accepts]: Start accepts. Automaton has 16132 states and 24741 transitions. Word has length 332 [2020-08-18 10:43:13,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:43:13,068 INFO L479 AbstractCegarLoop]: Abstraction has 16132 states and 24741 transitions. [2020-08-18 10:43:13,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:43:13,068 INFO L276 IsEmpty]: Start isEmpty. Operand 16132 states and 24741 transitions. [2020-08-18 10:43:13,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-08-18 10:43:13,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:43:13,102 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] [2020-08-18 10:43:13,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 10:43:13,102 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:43:13,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:43:13,104 INFO L82 PathProgramCache]: Analyzing trace with hash -310142286, now seen corresponding path program 1 times [2020-08-18 10:43:13,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:43:13,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472050888] [2020-08-18 10:43:13,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:43:13,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:13,574 WARN L193 SmtUtils]: Spent 360.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:43:13,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:43:13,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:13,665 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:43:13,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472050888] [2020-08-18 10:43:13,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:43:13,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:43:13,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102610792] [2020-08-18 10:43:13,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:43:13,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:43:13,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:43:13,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:13,675 INFO L87 Difference]: Start difference. First operand 16132 states and 24741 transitions. Second operand 4 states. [2020-08-18 10:43:21,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:43:21,993 INFO L93 Difference]: Finished difference Result 48321 states and 74099 transitions. [2020-08-18 10:43:21,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 10:43:21,993 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 332 [2020-08-18 10:43:21,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:43:22,061 INFO L225 Difference]: With dead ends: 48321 [2020-08-18 10:43:22,062 INFO L226 Difference]: Without dead ends: 32231 [2020-08-18 10:43:22,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:22,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32231 states. [2020-08-18 10:43:23,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32231 to 16151. [2020-08-18 10:43:23,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16151 states. [2020-08-18 10:43:23,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16151 states to 16151 states and 24769 transitions. [2020-08-18 10:43:23,662 INFO L78 Accepts]: Start accepts. Automaton has 16151 states and 24769 transitions. Word has length 332 [2020-08-18 10:43:23,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:43:23,662 INFO L479 AbstractCegarLoop]: Abstraction has 16151 states and 24769 transitions. [2020-08-18 10:43:23,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:43:23,662 INFO L276 IsEmpty]: Start isEmpty. Operand 16151 states and 24769 transitions. [2020-08-18 10:43:23,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2020-08-18 10:43:23,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:43:23,692 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] [2020-08-18 10:43:23,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 10:43:23,693 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:43:23,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:43:23,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1868318850, now seen corresponding path program 1 times [2020-08-18 10:43:23,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:43:23,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086764938] [2020-08-18 10:43:23,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:43:23,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:24,265 WARN L193 SmtUtils]: Spent 452.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:43:24,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:43:24,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:24,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:43:24,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086764938] [2020-08-18 10:43:24,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:43:24,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:43:24,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631395660] [2020-08-18 10:43:24,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:43:24,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:43:24,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:43:24,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:24,447 INFO L87 Difference]: Start difference. First operand 16151 states and 24769 transitions. Second operand 4 states.