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_preciseopt.epf -i ../../../trunk/examples/svcomp/forester-heap/dll-rb-sentinel_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 09:06:20,902 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 09:06:20,904 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 09:06:20,919 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 09:06:20,919 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 09:06:20,920 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 09:06:20,922 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 09:06:20,923 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 09:06:20,926 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 09:06:20,926 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 09:06:20,927 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 09:06:20,928 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 09:06:20,929 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 09:06:20,930 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 09:06:20,930 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 09:06:20,933 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 09:06:20,935 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 09:06:20,937 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 09:06:20,938 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 09:06:20,939 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 09:06:20,941 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 09:06:20,946 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 09:06:20,947 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 09:06:20,947 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_preciseopt.epf [2018-01-21 09:06:20,957 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 09:06:20,958 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 09:06:20,958 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 09:06:20,958 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 09:06:20,959 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 09:06:20,959 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 09:06:20,959 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 09:06:20,959 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 09:06:20,959 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 09:06:20,960 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 09:06:20,960 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 09:06:20,961 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 09:06:20,961 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 09:06:20,961 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 09:06:20,961 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 09:06:20,961 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 09:06:20,961 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 09:06:20,962 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 09:06:20,962 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 09:06:20,962 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 09:06:20,962 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 09:06:20,962 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 09:06:20,963 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 09:06:20,963 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 09:06:20,963 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 09:06:20,963 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 09:06:20,964 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 09:06:20,964 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 09:06:20,964 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 09:06:20,964 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 09:06:20,964 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 09:06:20,965 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 09:06:20,965 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 09:06:20,965 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 09:06:20,965 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 09:06:20,965 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 09:06:20,965 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 09:06:20,966 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 09:06:20,967 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 09:06:20,967 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 09:06:21,001 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 09:06:21,013 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 09:06:21,017 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 09:06:21,018 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 09:06:21,019 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 09:06:21,020 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/dll-rb-sentinel_true-unreach-call_true-valid-memsafety.i [2018-01-21 09:06:21,204 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 09:06:21,210 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 09:06:21,211 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 09:06:21,211 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 09:06:21,219 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 09:06:21,221 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 09:06:21" (1/1) ... [2018-01-21 09:06:21,224 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d4b61a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21, skipping insertion in model container [2018-01-21 09:06:21,224 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 09:06:21" (1/1) ... [2018-01-21 09:06:21,245 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 09:06:21,288 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 09:06:21,406 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 09:06:21,426 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 09:06:21,434 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21 WrapperNode [2018-01-21 09:06:21,465 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 09:06:21,466 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 09:06:21,466 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 09:06:21,466 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 09:06:21,477 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21" (1/1) ... [2018-01-21 09:06:21,478 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21" (1/1) ... [2018-01-21 09:06:21,488 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21" (1/1) ... [2018-01-21 09:06:21,489 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21" (1/1) ... [2018-01-21 09:06:21,494 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21" (1/1) ... [2018-01-21 09:06:21,499 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21" (1/1) ... [2018-01-21 09:06:21,501 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21" (1/1) ... [2018-01-21 09:06:21,503 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 09:06:21,503 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 09:06:21,503 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 09:06:21,503 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 09:06:21,505 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21" (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 09:06:21,554 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 09:06:21,554 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 09:06:21,554 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 09:06:21,554 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 09:06:21,555 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 09:06:21,555 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 09:06:21,555 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 09:06:21,555 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 09:06:21,555 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 09:06:21,555 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 09:06:21,556 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 09:06:21,556 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 09:06:21,556 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 09:06:21,556 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 09:06:21,556 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 09:06:21,557 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 09:06:21,557 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 09:06:21,966 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 09:06:21,967 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 09:06:21 BoogieIcfgContainer [2018-01-21 09:06:21,967 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 09:06:21,968 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 09:06:21,968 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 09:06:21,970 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 09:06:21,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 09:06:21" (1/3) ... [2018-01-21 09:06:21,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9f3a1f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 09:06:21, skipping insertion in model container [2018-01-21 09:06:21,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:06:21" (2/3) ... [2018-01-21 09:06:21,972 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9f3a1f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 09:06:21, skipping insertion in model container [2018-01-21 09:06:21,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 09:06:21" (3/3) ... [2018-01-21 09:06:21,973 INFO L105 eAbstractionObserver]: Analyzing ICFG dll-rb-sentinel_true-unreach-call_true-valid-memsafety.i [2018-01-21 09:06:21,980 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 09:06:21,986 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 09:06:22,033 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 09:06:22,033 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 09:06:22,034 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 09:06:22,034 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 09:06:22,034 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 09:06:22,034 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 09:06:22,034 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 09:06:22,034 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 09:06:22,035 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 09:06:22,052 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2018-01-21 09:06:22,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 09:06:22,058 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:06:22,059 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 09:06:22,059 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 09:06:22,063 INFO L82 PathProgramCache]: Analyzing trace with hash 267889, now seen corresponding path program 1 times [2018-01-21 09:06:22,065 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:06:22,112 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:22,112 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:06:22,112 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:22,113 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:06:22,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:06:22,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:06:22,161 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 09:06:22,167 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:06:22,174 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 09:06:22,174 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 09:06:22,174 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 09:06:22,175 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 09:06:22,175 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 09:06:22,175 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 09:06:22,175 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 09:06:22,175 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 09:06:22,175 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 09:06:22,179 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2018-01-21 09:06:22,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 09:06:22,181 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:06:22,181 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 09:06:22,182 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:06:22,182 INFO L82 PathProgramCache]: Analyzing trace with hash 2122179741, now seen corresponding path program 1 times [2018-01-21 09:06:22,182 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:06:22,183 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:22,184 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:06:22,184 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:22,184 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:06:22,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:06:22,227 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:06:22,389 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 09:06:22,391 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:06:22,391 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 09:06:22,392 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:06:22,395 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 09:06:22,411 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 09:06:22,411 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 09:06:22,414 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 2 states. [2018-01-21 09:06:22,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:06:22,438 INFO L93 Difference]: Finished difference Result 177 states and 235 transitions. [2018-01-21 09:06:22,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 09:06:22,440 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 27 [2018-01-21 09:06:22,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:06:22,450 INFO L225 Difference]: With dead ends: 177 [2018-01-21 09:06:22,450 INFO L226 Difference]: Without dead ends: 94 [2018-01-21 09:06:22,452 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 09:06:22,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-01-21 09:06:22,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-01-21 09:06:22,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-01-21 09:06:22,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 99 transitions. [2018-01-21 09:06:22,489 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 99 transitions. Word has length 27 [2018-01-21 09:06:22,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:06:22,490 INFO L432 AbstractCegarLoop]: Abstraction has 94 states and 99 transitions. [2018-01-21 09:06:22,490 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 09:06:22,490 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 99 transitions. [2018-01-21 09:06:22,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 09:06:22,492 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:06:22,492 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:06:22,492 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:06:22,492 INFO L82 PathProgramCache]: Analyzing trace with hash 798686160, now seen corresponding path program 1 times [2018-01-21 09:06:22,492 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:06:22,494 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:22,494 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:06:22,494 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:22,494 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:06:22,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:06:22,531 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:06:22,681 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 09:06:22,681 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:06:22,682 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-01-21 09:06:22,682 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:06:22,683 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 09:06:22,683 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 09:06:22,684 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-01-21 09:06:22,684 INFO L87 Difference]: Start difference. First operand 94 states and 99 transitions. Second operand 8 states. [2018-01-21 09:06:23,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:06:23,148 INFO L93 Difference]: Finished difference Result 155 states and 168 transitions. [2018-01-21 09:06:23,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 09:06:23,148 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 09:06:23,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:06:23,152 INFO L225 Difference]: With dead ends: 155 [2018-01-21 09:06:23,152 INFO L226 Difference]: Without dead ends: 135 [2018-01-21 09:06:23,153 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2018-01-21 09:06:23,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-01-21 09:06:23,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 96. [2018-01-21 09:06:23,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 09:06:23,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2018-01-21 09:06:23,161 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 36 [2018-01-21 09:06:23,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:06:23,161 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2018-01-21 09:06:23,161 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 09:06:23,161 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2018-01-21 09:06:23,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 09:06:23,162 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:06:23,163 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 09:06:23,163 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:06:23,163 INFO L82 PathProgramCache]: Analyzing trace with hash -611659746, now seen corresponding path program 1 times [2018-01-21 09:06:23,163 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:06:23,164 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:23,164 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:06:23,164 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:23,164 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:06:23,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:06:23,187 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:06:23,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 09:06:23,310 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:06:23,310 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-01-21 09:06:23,310 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:06:23,310 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 09:06:23,310 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 09:06:23,311 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-01-21 09:06:23,311 INFO L87 Difference]: Start difference. First operand 96 states and 101 transitions. Second operand 8 states. [2018-01-21 09:06:23,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:06:23,528 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2018-01-21 09:06:23,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 09:06:23,529 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 42 [2018-01-21 09:06:23,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:06:23,531 INFO L225 Difference]: With dead ends: 132 [2018-01-21 09:06:23,531 INFO L226 Difference]: Without dead ends: 126 [2018-01-21 09:06:23,532 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2018-01-21 09:06:23,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-01-21 09:06:23,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 98. [2018-01-21 09:06:23,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-01-21 09:06:23,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 103 transitions. [2018-01-21 09:06:23,542 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 103 transitions. Word has length 42 [2018-01-21 09:06:23,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:06:23,543 INFO L432 AbstractCegarLoop]: Abstraction has 98 states and 103 transitions. [2018-01-21 09:06:23,543 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 09:06:23,543 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 103 transitions. [2018-01-21 09:06:23,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-01-21 09:06:23,545 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:06:23,545 INFO L322 BasicCegarLoop]: trace histogram [2, 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, 1, 1] [2018-01-21 09:06:23,546 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:06:23,546 INFO L82 PathProgramCache]: Analyzing trace with hash 1884398603, now seen corresponding path program 1 times [2018-01-21 09:06:23,547 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:06:23,548 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:23,548 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:06:23,548 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:23,548 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:06:23,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:06:23,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:06:23,612 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 09:06:23,623 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:06:23,634 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:06:23,635 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:06:23,656 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 09:06:23,656 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 09:06:23,656 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 09:06:23,657 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 09:06:23,657 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 09:06:23,657 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 09:06:23,657 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 09:06:23,658 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 09:06:23,658 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 09:06:23,661 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2018-01-21 09:06:23,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-21 09:06:23,662 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:06:23,662 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 09:06:23,663 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 09:06:23,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1342988930, now seen corresponding path program 1 times [2018-01-21 09:06:23,663 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:06:23,665 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:23,665 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:06:23,665 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:23,665 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:06:23,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:06:23,678 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:06:23,691 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 09:06:23,692 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:06:23,692 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 09:06:23,692 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:06:23,693 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 09:06:23,693 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 09:06:23,693 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 09:06:23,693 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 2 states. [2018-01-21 09:06:23,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:06:23,698 INFO L93 Difference]: Finished difference Result 177 states and 235 transitions. [2018-01-21 09:06:23,699 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 09:06:23,699 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 25 [2018-01-21 09:06:23,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:06:23,700 INFO L225 Difference]: With dead ends: 177 [2018-01-21 09:06:23,700 INFO L226 Difference]: Without dead ends: 92 [2018-01-21 09:06:23,701 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 09:06:23,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-01-21 09:06:23,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2018-01-21 09:06:23,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-01-21 09:06:23,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 97 transitions. [2018-01-21 09:06:23,709 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 97 transitions. Word has length 25 [2018-01-21 09:06:23,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:06:23,709 INFO L432 AbstractCegarLoop]: Abstraction has 92 states and 97 transitions. [2018-01-21 09:06:23,709 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 09:06:23,709 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 97 transitions. [2018-01-21 09:06:23,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 09:06:23,711 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:06:23,711 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:06:23,711 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 09:06:23,711 INFO L82 PathProgramCache]: Analyzing trace with hash -1210340747, now seen corresponding path program 1 times [2018-01-21 09:06:23,711 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:06:23,713 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:23,713 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:06:23,713 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:23,713 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:06:23,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:06:23,727 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:06:23,834 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 09:06:23,835 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:06:23,835 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-01-21 09:06:23,835 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:06:23,835 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 09:06:23,835 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 09:06:23,836 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-01-21 09:06:23,836 INFO L87 Difference]: Start difference. First operand 92 states and 97 transitions. Second operand 8 states. [2018-01-21 09:06:24,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:06:24,054 INFO L93 Difference]: Finished difference Result 151 states and 163 transitions. [2018-01-21 09:06:24,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 09:06:24,055 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 34 [2018-01-21 09:06:24,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:06:24,057 INFO L225 Difference]: With dead ends: 151 [2018-01-21 09:06:24,057 INFO L226 Difference]: Without dead ends: 133 [2018-01-21 09:06:24,057 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2018-01-21 09:06:24,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-01-21 09:06:24,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 94. [2018-01-21 09:06:24,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-01-21 09:06:24,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 99 transitions. [2018-01-21 09:06:24,065 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 99 transitions. Word has length 34 [2018-01-21 09:06:24,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:06:24,066 INFO L432 AbstractCegarLoop]: Abstraction has 94 states and 99 transitions. [2018-01-21 09:06:24,066 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 09:06:24,066 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 99 transitions. [2018-01-21 09:06:24,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-01-21 09:06:24,068 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:06:24,068 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] [2018-01-21 09:06:24,068 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 09:06:24,069 INFO L82 PathProgramCache]: Analyzing trace with hash -961529277, now seen corresponding path program 1 times [2018-01-21 09:06:24,069 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:06:24,070 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:24,071 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:06:24,071 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:24,071 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:06:24,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:06:24,085 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:06:24,179 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 09:06:24,179 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:06:24,179 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-01-21 09:06:24,179 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:06:24,180 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 09:06:24,180 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 09:06:24,180 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-01-21 09:06:24,180 INFO L87 Difference]: Start difference. First operand 94 states and 99 transitions. Second operand 8 states. [2018-01-21 09:06:24,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:06:24,341 INFO L93 Difference]: Finished difference Result 128 states and 136 transitions. [2018-01-21 09:06:24,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 09:06:24,341 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2018-01-21 09:06:24,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:06:24,342 INFO L225 Difference]: With dead ends: 128 [2018-01-21 09:06:24,342 INFO L226 Difference]: Without dead ends: 124 [2018-01-21 09:06:24,343 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2018-01-21 09:06:24,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-01-21 09:06:24,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 96. [2018-01-21 09:06:24,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 09:06:24,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2018-01-21 09:06:24,351 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 40 [2018-01-21 09:06:24,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:06:24,351 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2018-01-21 09:06:24,351 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 09:06:24,351 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2018-01-21 09:06:24,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-01-21 09:06:24,353 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:06:24,353 INFO L322 BasicCegarLoop]: trace histogram [2, 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 09:06:24,353 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 09:06:24,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1660607120, now seen corresponding path program 1 times [2018-01-21 09:06:24,353 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:06:24,355 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:24,355 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:06:24,355 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:06:24,355 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:06:24,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:06:24,374 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:06:24,803 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 09:06:24,804 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 09:06:24,804 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 09:06:24,805 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 49 with the following transitions: [2018-01-21 09:06:24,807 INFO L201 CegarAbsIntRunner]: [0], [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [14], [16], [19], [104], [108], [113], [117], [125], [126], [131], [135], [143], [147], [149], [150], [193], [195], [196], [202], [206], [208], [209], [220], [221], [222], [223], [224], [229], [230], [232], [233], [234], [240], [241], [242] [2018-01-21 09:06:24,867 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 09:06:24,867 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