/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:53:32,676 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:53:32,679 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:53:32,719 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:53:32,720 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:53:32,729 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:53:32,730 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:53:32,733 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:53:32,735 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:53:32,738 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:53:32,740 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:53:32,742 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:53:32,742 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:53:32,745 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:53:32,747 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:53:32,748 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:53:32,750 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:53:32,751 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:53:32,753 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:53:32,758 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:53:32,761 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:53:32,762 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:53:32,762 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:53:32,763 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:53:32,775 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 15:53:32,775 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 15:53:32,775 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 15:53:32,778 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 15:53:32,778 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 15:53:32,781 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 15:53:32,781 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 15:53:32,782 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 15:53:32,783 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 15:53:32,784 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 15:53:32,785 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 15:53:32,785 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 15:53:32,785 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 15:53:32,786 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 15:53:32,786 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:53:32,787 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:53:32,787 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:53:32,788 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 [2020-08-21 15:53:32,808 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:53:32,809 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:53:32,810 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:53:32,810 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:53:32,810 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:53:32,811 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:53:32,811 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:53:32,811 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:53:32,811 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:53:32,811 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:53:32,811 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:53:32,812 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:53:32,812 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:53:32,812 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:53:32,812 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:53:32,812 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:53:32,813 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:53:32,813 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:53:32,813 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:53:32,813 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:53:32,813 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:53:32,813 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:53:32,814 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:53:32,814 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:53:32,814 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:53:32,814 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:53:32,814 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:53:32,815 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:53:32,815 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:53:32,815 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:53:33,103 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:53:33,115 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:53:33,119 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:53:33,120 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:53:33,121 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:53:33,121 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 15:53:33,197 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f52209a6d/228ddd045ece428d9ec65c9caf9e1103/FLAG4a2053c7d [2020-08-21 15:53:33,843 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:53:33,844 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 15:53:33,866 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f52209a6d/228ddd045ece428d9ec65c9caf9e1103/FLAG4a2053c7d [2020-08-21 15:53:34,024 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f52209a6d/228ddd045ece428d9ec65c9caf9e1103 [2020-08-21 15:53:34,033 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:53:34,034 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:53:34,036 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:53:34,036 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:53:34,042 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:53:34,043 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:53:34" (1/1) ... [2020-08-21 15:53:34,047 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ea47b5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:34, skipping insertion in model container [2020-08-21 15:53:34,047 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:53:34" (1/1) ... [2020-08-21 15:53:34,057 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:53:34,267 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:53:35,680 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:53:35,696 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:53:37,031 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:53:37,083 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:53:37,084 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37 WrapperNode [2020-08-21 15:53:37,085 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:53:37,086 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:53:37,087 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:53:37,087 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:53:37,109 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37" (1/1) ... [2020-08-21 15:53:37,111 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37" (1/1) ... [2020-08-21 15:53:37,181 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37" (1/1) ... [2020-08-21 15:53:37,182 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37" (1/1) ... [2020-08-21 15:53:37,279 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37" (1/1) ... [2020-08-21 15:53:37,315 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37" (1/1) ... [2020-08-21 15:53:37,330 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37" (1/1) ... [2020-08-21 15:53:37,352 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:53:37,352 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:53:37,353 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:53:37,353 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:53:37,354 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37" (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 [2020-08-21 15:53:37,455 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:53:37,456 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:53:37,457 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 15:53:37,457 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:53:37,458 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:53:37,458 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 15:53:37,458 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 15:53:37,459 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-21 15:53:37,459 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 15:53:37,460 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 15:53:37,461 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-21 15:53:37,461 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-21 15:53:37,461 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-21 15:53:37,462 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-21 15:53:37,462 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-21 15:53:37,463 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-21 15:53:37,464 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-21 15:53:37,464 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 15:53:37,464 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 15:53:37,465 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:53:37,465 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:53:37,465 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:53:41,241 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:53:41,241 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 15:53:41,259 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:53:41 BoogieIcfgContainer [2020-08-21 15:53:41,259 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:53:41,262 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:53:41,263 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:53:41,266 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:53:41,266 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:53:34" (1/3) ... [2020-08-21 15:53:41,267 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bbbad18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:53:41, skipping insertion in model container [2020-08-21 15:53:41,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:53:37" (2/3) ... [2020-08-21 15:53:41,268 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bbbad18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:53:41, skipping insertion in model container [2020-08-21 15:53:41,268 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:53:41" (3/3) ... [2020-08-21 15:53:41,271 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 15:53:41,282 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:53:41,296 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:53:41,312 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:53:41,351 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:53:41,351 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:53:41,352 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:53:41,352 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:53:41,352 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:53:41,352 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:53:41,352 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:53:41,353 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:53:41,393 INFO L276 IsEmpty]: Start isEmpty. Operand 1322 states. [2020-08-21 15:53:41,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-21 15:53:41,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:53:41,440 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] [2020-08-21 15:53:41,441 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:53:41,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:53:41,449 INFO L82 PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times [2020-08-21 15:53:41,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:53:41,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888148388] [2020-08-21 15:53:41,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:53:42,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:53:44,624 WARN L193 SmtUtils]: Spent 1.19 s on a formula simplification that was a NOOP. DAG size: 388 [2020-08-21 15:53:44,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:53:44,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:53:44,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:53:44,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888148388] [2020-08-21 15:53:44,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:53:44,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:53:44,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284941815] [2020-08-21 15:53:44,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:53:44,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:53:44,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:53:44,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:53:44,947 INFO L87 Difference]: Start difference. First operand 1322 states. Second operand 4 states. [2020-08-21 15:53:45,756 WARN L193 SmtUtils]: Spent 711.00 ms on a formula simplification that was a NOOP. DAG size: 389 [2020-08-21 15:53:55,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:53:55,136 INFO L93 Difference]: Finished difference Result 2212 states and 3947 transitions. [2020-08-21 15:53:55,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:53:55,138 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 467 [2020-08-21 15:53:55,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:53:55,179 INFO L225 Difference]: With dead ends: 2212 [2020-08-21 15:53:55,180 INFO L226 Difference]: Without dead ends: 1956 [2020-08-21 15:53:55,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:53:55,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1956 states. [2020-08-21 15:53:55,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1956 to 1954. [2020-08-21 15:53:55,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1954 states. [2020-08-21 15:53:55,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1954 states to 1954 states and 3183 transitions. [2020-08-21 15:53:55,353 INFO L78 Accepts]: Start accepts. Automaton has 1954 states and 3183 transitions. Word has length 467 [2020-08-21 15:53:55,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:53:55,355 INFO L479 AbstractCegarLoop]: Abstraction has 1954 states and 3183 transitions. [2020-08-21 15:53:55,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:53:55,356 INFO L276 IsEmpty]: Start isEmpty. Operand 1954 states and 3183 transitions. [2020-08-21 15:53:55,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-21 15:53:55,370 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:53:55,371 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] [2020-08-21 15:53:55,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:53:55,371 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:53:55,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:53:55,372 INFO L82 PathProgramCache]: Analyzing trace with hash -1227921449, now seen corresponding path program 1 times [2020-08-21 15:53:55,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:53:55,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [930679944] [2020-08-21 15:53:55,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:53:56,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:53:57,939 WARN L193 SmtUtils]: Spent 840.00 ms on a formula simplification that was a NOOP. DAG size: 388 [2020-08-21 15:53:57,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:53:57,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:53:58,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:53:58,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [930679944] [2020-08-21 15:53:58,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:53:58,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:53:58,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907848407] [2020-08-21 15:53:58,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:53:58,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:53:58,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:53:58,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:53:58,678 INFO L87 Difference]: Start difference. First operand 1954 states and 3183 transitions. Second operand 5 states. [2020-08-21 15:54:12,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:54:12,800 INFO L93 Difference]: Finished difference Result 5793 states and 9438 transitions. [2020-08-21 15:54:12,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:54:12,807 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 467 [2020-08-21 15:54:12,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:54:12,828 INFO L225 Difference]: With dead ends: 5793 [2020-08-21 15:54:12,828 INFO L226 Difference]: Without dead ends: 3856 [2020-08-21 15:54:12,834 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 [2020-08-21 15:54:12,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3856 states. [2020-08-21 15:54:12,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3856 to 3854. [2020-08-21 15:54:12,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3854 states. [2020-08-21 15:54:12,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3854 states to 3854 states and 6254 transitions. [2020-08-21 15:54:12,985 INFO L78 Accepts]: Start accepts. Automaton has 3854 states and 6254 transitions. Word has length 467 [2020-08-21 15:54:12,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:54:12,986 INFO L479 AbstractCegarLoop]: Abstraction has 3854 states and 6254 transitions. [2020-08-21 15:54:12,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:54:12,986 INFO L276 IsEmpty]: Start isEmpty. Operand 3854 states and 6254 transitions. [2020-08-21 15:54:13,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-08-21 15:54:13,000 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:54:13,001 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] [2020-08-21 15:54:13,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:54:13,002 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:54:13,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:54:13,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1934187579, now seen corresponding path program 1 times [2020-08-21 15:54:13,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:54:13,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1532493385] [2020-08-21 15:54:13,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:54:13,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:54:14,284 WARN L193 SmtUtils]: Spent 771.00 ms on a formula simplification that was a NOOP. DAG size: 388 [2020-08-21 15:54:14,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:54:14,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:54:14,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:54:14,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1532493385] [2020-08-21 15:54:14,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:54:14,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:54:14,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897948664] [2020-08-21 15:54:14,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:54:14,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:54:14,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:54:14,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:54:14,538 INFO L87 Difference]: Start difference. First operand 3854 states and 6254 transitions. Second operand 4 states. [2020-08-21 15:54:30,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:54:30,691 INFO L93 Difference]: Finished difference Result 11260 states and 18231 transitions. [2020-08-21 15:54:30,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:54:30,692 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 469 [2020-08-21 15:54:30,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:54:30,727 INFO L225 Difference]: With dead ends: 11260 [2020-08-21 15:54:30,727 INFO L226 Difference]: Without dead ends: 7620 [2020-08-21 15:54:30,736 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 [2020-08-21 15:54:30,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7620 states. [2020-08-21 15:54:30,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7620 to 7618. [2020-08-21 15:54:30,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7618 states. [2020-08-21 15:54:31,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7618 states to 7618 states and 12321 transitions. [2020-08-21 15:54:31,028 INFO L78 Accepts]: Start accepts. Automaton has 7618 states and 12321 transitions. Word has length 469 [2020-08-21 15:54:31,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:54:31,029 INFO L479 AbstractCegarLoop]: Abstraction has 7618 states and 12321 transitions. [2020-08-21 15:54:31,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:54:31,029 INFO L276 IsEmpty]: Start isEmpty. Operand 7618 states and 12321 transitions. [2020-08-21 15:54:31,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-08-21 15:54:31,053 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:54:31,053 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] [2020-08-21 15:54:31,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:54:31,054 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:54:31,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:54:31,054 INFO L82 PathProgramCache]: Analyzing trace with hash -269242540, now seen corresponding path program 1 times [2020-08-21 15:54:31,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:54:31,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775110284] [2020-08-21 15:54:31,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:54:31,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat