java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf -i ../../../trunk/examples/svcomp/memsafety-ext/tree_of_cslls_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:19:07,686 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:19:07,688 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:19:07,703 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:19:07,703 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:19:07,704 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:19:07,705 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:19:07,706 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:19:07,707 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:19:07,708 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:19:07,709 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:19:07,709 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:19:07,710 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:19:07,712 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:19:07,713 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:19:07,715 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:19:07,717 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:19:07,719 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:19:07,720 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:19:07,721 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:19:07,723 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 10:19:07,724 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 10:19:07,724 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 10:19:07,725 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 10:19:07,726 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 10:19:07,727 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 10:19:07,727 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 10:19:07,728 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 10:19:07,728 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 10:19:07,728 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:19:07,729 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:19:07,729 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf [2018-01-21 10:19:07,739 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:19:07,739 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:19:07,740 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:19:07,740 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:19:07,740 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:19:07,740 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:19:07,741 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:19:07,741 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:19:07,741 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:19:07,742 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:19:07,742 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:19:07,742 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:19:07,742 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:19:07,742 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:19:07,743 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:19:07,743 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:19:07,743 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:19:07,743 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:19:07,743 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:19:07,743 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:19:07,744 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:19:07,744 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:19:07,744 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:19:07,744 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:19:07,745 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:19:07,745 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:19:07,745 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:19:07,745 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:19:07,745 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:19:07,746 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:19:07,746 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:19:07,746 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:19:07,746 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:19:07,746 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:19:07,746 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:19:07,747 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:19:07,747 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:19:07,748 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:19:07,748 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:19:07,783 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:19:07,795 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:19:07,799 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:19:07,800 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:19:07,801 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:19:07,802 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/memsafety-ext/tree_of_cslls_true-valid-memsafety.i [2018-01-21 10:19:07,980 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:19:07,985 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:19:08,007 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:19:08,008 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:19:08,013 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:19:08,014 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:19:07" (1/1) ... [2018-01-21 10:19:08,016 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f49c1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08, skipping insertion in model container [2018-01-21 10:19:08,016 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:19:07" (1/1) ... [2018-01-21 10:19:08,029 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:19:08,067 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:19:08,183 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:19:08,203 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:19:08,214 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08 WrapperNode [2018-01-21 10:19:08,215 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:19:08,216 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:19:08,216 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:19:08,216 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:19:08,227 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08" (1/1) ... [2018-01-21 10:19:08,227 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08" (1/1) ... [2018-01-21 10:19:08,237 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08" (1/1) ... [2018-01-21 10:19:08,237 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08" (1/1) ... [2018-01-21 10:19:08,245 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08" (1/1) ... [2018-01-21 10:19:08,249 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08" (1/1) ... [2018-01-21 10:19:08,250 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08" (1/1) ... [2018-01-21 10:19:08,252 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:19:08,253 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:19:08,253 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:19:08,253 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:19:08,254 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08" (1/1) ... No working directory specified, using /storage/ultimate/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 [2018-01-21 10:19:08,299 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:19:08,299 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:19:08,299 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:19:08,300 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:19:08,762 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:19:08,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:19:08 BoogieIcfgContainer [2018-01-21 10:19:08,763 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:19:08,764 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:19:08,764 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:19:08,766 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:19:08,767 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:19:07" (1/3) ... [2018-01-21 10:19:08,768 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@124582c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:19:08, skipping insertion in model container [2018-01-21 10:19:08,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:19:08" (2/3) ... [2018-01-21 10:19:08,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@124582c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:19:08, skipping insertion in model container [2018-01-21 10:19:08,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:19:08" (3/3) ... [2018-01-21 10:19:08,771 INFO L105 eAbstractionObserver]: Analyzing ICFG tree_of_cslls_true-valid-memsafety.i [2018-01-21 10:19:08,780 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:19:08,789 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 10:19:08,841 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:19:08,841 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:19:08,841 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:19:08,841 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:19:08,841 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:19:08,841 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:19:08,842 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:19:08,842 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:19:08,842 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:19:08,861 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states. [2018-01-21 10:19:08,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:19:08,866 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:19:08,867 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:19:08,867 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:19:08,871 INFO L82 PathProgramCache]: Analyzing trace with hash 262355, now seen corresponding path program 1 times [2018-01-21 10:19:08,873 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:19:08,913 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:08,914 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:19:08,914 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:08,914 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:19:08,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:19:08,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:19:08,971 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:19:08,976 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:19:08,983 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:19:08,983 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:19:08,984 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:19:08,984 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:19:08,984 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:19:08,984 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:19:08,984 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:19:08,984 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:19:08,984 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:19:08,987 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states. [2018-01-21 10:19:08,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 10:19:08,989 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:19:08,990 INFO L322 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] [2018-01-21 10:19:08,990 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:19:08,990 INFO L82 PathProgramCache]: Analyzing trace with hash -936424552, now seen corresponding path program 1 times [2018-01-21 10:19:08,990 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:19:08,991 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:08,991 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:19:08,991 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:08,991 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:19:09,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:19:09,021 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:19:09,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:19:09,163 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:19:09,163 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:19:09,164 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:19:09,167 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:19:09,182 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:19:09,183 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:19:09,185 INFO L87 Difference]: Start difference. First operand 122 states. Second operand 2 states. [2018-01-21 10:19:09,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:19:09,213 INFO L93 Difference]: Finished difference Result 216 states and 260 transitions. [2018-01-21 10:19:09,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:19:09,214 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-01-21 10:19:09,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:19:09,229 INFO L225 Difference]: With dead ends: 216 [2018-01-21 10:19:09,229 INFO L226 Difference]: Without dead ends: 119 [2018-01-21 10:19:09,232 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:19:09,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-01-21 10:19:09,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2018-01-21 10:19:09,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-01-21 10:19:09,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 135 transitions. [2018-01-21 10:19:09,273 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 135 transitions. Word has length 22 [2018-01-21 10:19:09,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:19:09,274 INFO L432 AbstractCegarLoop]: Abstraction has 119 states and 135 transitions. [2018-01-21 10:19:09,274 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:19:09,274 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 135 transitions. [2018-01-21 10:19:09,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 10:19:09,275 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:19:09,275 INFO L322 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] [2018-01-21 10:19:09,275 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:19:09,275 INFO L82 PathProgramCache]: Analyzing trace with hash -1072713404, now seen corresponding path program 1 times [2018-01-21 10:19:09,275 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:19:09,276 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,276 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:19:09,276 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,276 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:19:09,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:19:09,294 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:19:09,363 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:19:09,363 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:19:09,364 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 10:19:09,364 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:19:09,365 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 10:19:09,366 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 10:19:09,366 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 10:19:09,366 INFO L87 Difference]: Start difference. First operand 119 states and 135 transitions. Second operand 4 states. [2018-01-21 10:19:09,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:19:09,427 INFO L93 Difference]: Finished difference Result 161 states and 183 transitions. [2018-01-21 10:19:09,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 10:19:09,427 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 27 [2018-01-21 10:19:09,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:19:09,430 INFO L225 Difference]: With dead ends: 161 [2018-01-21 10:19:09,430 INFO L226 Difference]: Without dead ends: 156 [2018-01-21 10:19:09,432 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 10:19:09,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-01-21 10:19:09,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2018-01-21 10:19:09,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-01-21 10:19:09,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 178 transitions. [2018-01-21 10:19:09,447 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 178 transitions. Word has length 27 [2018-01-21 10:19:09,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:19:09,447 INFO L432 AbstractCegarLoop]: Abstraction has 156 states and 178 transitions. [2018-01-21 10:19:09,447 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 10:19:09,448 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 178 transitions. [2018-01-21 10:19:09,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-21 10:19:09,450 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:19:09,450 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:19:09,450 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:19:09,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1759311448, now seen corresponding path program 1 times [2018-01-21 10:19:09,451 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:19:09,452 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,452 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:19:09,452 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,452 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:19:09,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:19:09,477 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:19:09,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:19:09,512 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:19:09,513 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:19:09,513 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:19:09,513 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:19:09,513 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:19:09,513 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:19:09,514 INFO L87 Difference]: Start difference. First operand 156 states and 178 transitions. Second operand 3 states. [2018-01-21 10:19:09,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:19:09,534 INFO L93 Difference]: Finished difference Result 237 states and 273 transitions. [2018-01-21 10:19:09,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:19:09,535 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 44 [2018-01-21 10:19:09,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:19:09,537 INFO L225 Difference]: With dead ends: 237 [2018-01-21 10:19:09,537 INFO L226 Difference]: Without dead ends: 158 [2018-01-21 10:19:09,538 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:19:09,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2018-01-21 10:19:09,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2018-01-21 10:19:09,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2018-01-21 10:19:09,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 180 transitions. [2018-01-21 10:19:09,547 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 180 transitions. Word has length 44 [2018-01-21 10:19:09,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:19:09,548 INFO L432 AbstractCegarLoop]: Abstraction has 158 states and 180 transitions. [2018-01-21 10:19:09,548 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:19:09,548 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 180 transitions. [2018-01-21 10:19:09,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 10:19:09,550 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:19:09,550 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:19:09,550 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:19:09,550 INFO L82 PathProgramCache]: Analyzing trace with hash -512140811, now seen corresponding path program 1 times [2018-01-21 10:19:09,550 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:19:09,551 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,551 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:19:09,551 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,551 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:19:09,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:19:09,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:19:09,615 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:19:09,625 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:19:09,635 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:19:09,635 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:19:09,654 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:19:09,655 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:19:09,655 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:19:09,655 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:19:09,655 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:19:09,655 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:19:09,655 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:19:09,655 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 10:19:09,655 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:19:09,658 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states. [2018-01-21 10:19:09,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 10:19:09,658 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:19:09,659 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:19:09,659 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 10:19:09,659 INFO L82 PathProgramCache]: Analyzing trace with hash -769688664, now seen corresponding path program 1 times [2018-01-21 10:19:09,659 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:19:09,660 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,660 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:19:09,660 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,660 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:19:09,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:19:09,670 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:19:09,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:19:09,681 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:19:09,682 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:19:09,682 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:19:09,682 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:19:09,682 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:19:09,682 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:19:09,683 INFO L87 Difference]: Start difference. First operand 122 states. Second operand 2 states. [2018-01-21 10:19:09,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:19:09,689 INFO L93 Difference]: Finished difference Result 216 states and 260 transitions. [2018-01-21 10:19:09,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:19:09,689 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2018-01-21 10:19:09,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:19:09,691 INFO L225 Difference]: With dead ends: 216 [2018-01-21 10:19:09,691 INFO L226 Difference]: Without dead ends: 117 [2018-01-21 10:19:09,692 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:19:09,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-01-21 10:19:09,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-01-21 10:19:09,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-01-21 10:19:09,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 133 transitions. [2018-01-21 10:19:09,700 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 133 transitions. Word has length 20 [2018-01-21 10:19:09,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:19:09,701 INFO L432 AbstractCegarLoop]: Abstraction has 117 states and 133 transitions. [2018-01-21 10:19:09,701 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:19:09,701 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 133 transitions. [2018-01-21 10:19:09,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-21 10:19:09,702 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:19:09,702 INFO L322 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] [2018-01-21 10:19:09,702 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 10:19:09,702 INFO L82 PathProgramCache]: Analyzing trace with hash -403350444, now seen corresponding path program 1 times [2018-01-21 10:19:09,702 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:19:09,703 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,703 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:19:09,703 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,703 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:19:09,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:19:09,711 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:19:09,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:19:09,757 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:19:09,758 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 10:19:09,758 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:19:09,758 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 10:19:09,758 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 10:19:09,759 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 10:19:09,759 INFO L87 Difference]: Start difference. First operand 117 states and 133 transitions. Second operand 4 states. [2018-01-21 10:19:09,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:19:09,821 INFO L93 Difference]: Finished difference Result 157 states and 179 transitions. [2018-01-21 10:19:09,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 10:19:09,821 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2018-01-21 10:19:09,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:19:09,822 INFO L225 Difference]: With dead ends: 157 [2018-01-21 10:19:09,822 INFO L226 Difference]: Without dead ends: 154 [2018-01-21 10:19:09,822 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 10:19:09,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-01-21 10:19:09,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-01-21 10:19:09,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-01-21 10:19:09,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 176 transitions. [2018-01-21 10:19:09,831 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 176 transitions. Word has length 25 [2018-01-21 10:19:09,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:19:09,831 INFO L432 AbstractCegarLoop]: Abstraction has 154 states and 176 transitions. [2018-01-21 10:19:09,831 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 10:19:09,831 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 176 transitions. [2018-01-21 10:19:09,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 10:19:09,832 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:19:09,833 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:19:09,833 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 10:19:09,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1941493352, now seen corresponding path program 1 times [2018-01-21 10:19:09,833 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:19:09,834 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,834 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:19:09,834 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,835 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:19:09,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:19:09,848 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:19:09,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:19:09,869 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:19:09,869 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:19:09,869 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:19:09,870 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:19:09,870 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:19:09,870 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:19:09,870 INFO L87 Difference]: Start difference. First operand 154 states and 176 transitions. Second operand 3 states. [2018-01-21 10:19:09,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:19:09,886 INFO L93 Difference]: Finished difference Result 233 states and 269 transitions. [2018-01-21 10:19:09,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:19:09,887 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 42 [2018-01-21 10:19:09,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:19:09,888 INFO L225 Difference]: With dead ends: 233 [2018-01-21 10:19:09,888 INFO L226 Difference]: Without dead ends: 156 [2018-01-21 10:19:09,889 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:19:09,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-01-21 10:19:09,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2018-01-21 10:19:09,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-01-21 10:19:09,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 178 transitions. [2018-01-21 10:19:09,897 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 178 transitions. Word has length 42 [2018-01-21 10:19:09,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:19:09,897 INFO L432 AbstractCegarLoop]: Abstraction has 156 states and 178 transitions. [2018-01-21 10:19:09,897 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:19:09,897 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 178 transitions. [2018-01-21 10:19:09,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-21 10:19:09,899 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:19:09,899 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:19:09,899 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 10:19:09,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1818459461, now seen corresponding path program 1 times [2018-01-21 10:19:09,899 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:19:09,900 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,900 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:19:09,900 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:19:09,900 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:19:09,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:19:09,918 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:19:10,479 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:19:10,480 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:19:10,480 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:19:10,481 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 45 with the following transitions: [2018-01-21 10:19:10,483 INFO L201 CegarAbsIntRunner]: [0], [1], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [20], [22], [25], [42], [44], [47], [153], [157], [159], [163], [165], [166], [171], [172], [173], [177], [207], [211], [213], [214], [215], [218], [232], [233], [234], [235], [239], [241], [242], [243], [244] [2018-01-21 10:19:10,541 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:19:10,541 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown