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.epf -i ../../../trunk/examples/svcomp/memsafety-ext/tree_of_cslls_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:36:51,624 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:36:51,625 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:36:51,640 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:36:51,640 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:36:51,641 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:36:51,642 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:36:51,644 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:36:51,646 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:36:51,646 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:36:51,647 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:36:51,648 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:36:51,649 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:36:51,650 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:36:51,651 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:36:51,653 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:36:51,655 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:36:51,657 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:36:51,659 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:36:51,660 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:36:51,662 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-20 23:36:51,667 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:36:51,668 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:36:51,668 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.epf [2018-01-20 23:36:51,677 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:36:51,677 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:36:51,678 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:36:51,678 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:36:51,678 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:36:51,678 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:36:51,678 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:36:51,679 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:36:51,679 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:36:51,679 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:36:51,679 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:36:51,679 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:36:51,679 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:36:51,680 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:36:51,680 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:36:51,680 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:36:51,680 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:36:51,680 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:36:51,680 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:36:51,680 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:36:51,681 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:36:51,681 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:36:51,681 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:36:51,681 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:36:51,681 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:36:51,682 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:36:51,682 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:36:51,682 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:36:51,682 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:36:51,682 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:36:51,682 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:36:51,682 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:36:51,682 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:36:51,683 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:36:51,683 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:36:51,683 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:36:51,684 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:36:51,684 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:36:51,717 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:36:51,729 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:36:51,732 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:36:51,733 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:36:51,733 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:36:51,734 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/memsafety-ext/tree_of_cslls_true-valid-memsafety.i [2018-01-20 23:36:51,917 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:36:51,920 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:36:51,920 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:36:51,921 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:36:51,925 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:36:51,926 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:36:51" (1/1) ... [2018-01-20 23:36:51,928 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@408feb46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:51, skipping insertion in model container [2018-01-20 23:36:51,929 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:36:51" (1/1) ... [2018-01-20 23:36:51,941 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:36:51,977 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:36:52,103 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:36:52,131 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:36:52,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52 WrapperNode [2018-01-20 23:36:52,143 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:36:52,144 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:36:52,144 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:36:52,144 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:36:52,158 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52" (1/1) ... [2018-01-20 23:36:52,158 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52" (1/1) ... [2018-01-20 23:36:52,169 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52" (1/1) ... [2018-01-20 23:36:52,169 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52" (1/1) ... [2018-01-20 23:36:52,180 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52" (1/1) ... [2018-01-20 23:36:52,185 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52" (1/1) ... [2018-01-20 23:36:52,187 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52" (1/1) ... [2018-01-20 23:36:52,191 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:36:52,191 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:36:52,191 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:36:52,192 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:36:52,193 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52" (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 [2018-01-20 23:36:52,239 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:36:52,239 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:36:52,239 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:36:52,239 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-20 23:36:52,239 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-20 23:36:52,239 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:36:52,240 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:36:52,240 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:36:52,240 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-20 23:36:52,240 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-20 23:36:52,240 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-20 23:36:52,240 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:36:52,241 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:36:52,241 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:36:52,747 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:36:52,748 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:36:52 BoogieIcfgContainer [2018-01-20 23:36:52,748 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:36:52,749 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:36:52,750 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:36:52,751 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:36:52,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:36:51" (1/3) ... [2018-01-20 23:36:52,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@333ea925 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:36:52, skipping insertion in model container [2018-01-20 23:36:52,753 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:36:52" (2/3) ... [2018-01-20 23:36:52,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@333ea925 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:36:52, skipping insertion in model container [2018-01-20 23:36:52,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:36:52" (3/3) ... [2018-01-20 23:36:52,755 INFO L105 eAbstractionObserver]: Analyzing ICFG tree_of_cslls_true-valid-memsafety.i [2018-01-20 23:36:52,762 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:36:52,769 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-20 23:36:52,807 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:36:52,808 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:36:52,808 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:36:52,808 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:36:52,808 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:36:52,808 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:36:52,808 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:36:52,808 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:36:52,809 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:36:52,826 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states. [2018-01-20 23:36:52,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:36:52,831 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:36:52,832 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:36:52,832 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:36:52,836 INFO L82 PathProgramCache]: Analyzing trace with hash 262355, now seen corresponding path program 1 times [2018-01-20 23:36:52,838 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:36:52,878 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:52,878 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:36:52,878 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:52,879 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:36:52,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:36:52,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:36:52,928 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:36:52,935 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:36:52,942 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:36:52,943 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:36:52,943 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:36:52,943 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:36:52,943 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:36:52,943 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:36:52,943 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:36:52,944 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:36:52,944 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:36:52,947 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states. [2018-01-20 23:36:52,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-20 23:36:52,949 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:36:52,950 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] [2018-01-20 23:36:52,950 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:36:52,950 INFO L82 PathProgramCache]: Analyzing trace with hash -936424552, now seen corresponding path program 1 times [2018-01-20 23:36:52,950 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:36:52,951 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:52,951 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:36:52,951 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:52,951 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:36:52,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:36:52,985 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:36:53,118 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:36:53,120 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:36:53,120 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:36:53,120 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:36:53,123 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:36:53,133 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:36:53,134 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:36:53,136 INFO L87 Difference]: Start difference. First operand 122 states. Second operand 2 states. [2018-01-20 23:36:53,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:36:53,159 INFO L93 Difference]: Finished difference Result 216 states and 260 transitions. [2018-01-20 23:36:53,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:36:53,160 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-01-20 23:36:53,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:36:53,170 INFO L225 Difference]: With dead ends: 216 [2018-01-20 23:36:53,170 INFO L226 Difference]: Without dead ends: 119 [2018-01-20 23:36:53,174 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 [2018-01-20 23:36:53,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-01-20 23:36:53,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2018-01-20 23:36:53,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-01-20 23:36:53,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 135 transitions. [2018-01-20 23:36:53,218 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 135 transitions. Word has length 22 [2018-01-20 23:36:53,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:36:53,218 INFO L432 AbstractCegarLoop]: Abstraction has 119 states and 135 transitions. [2018-01-20 23:36:53,218 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:36:53,219 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 135 transitions. [2018-01-20 23:36:53,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-20 23:36:53,219 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:36:53,220 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] [2018-01-20 23:36:53,220 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:36:53,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1072713404, now seen corresponding path program 1 times [2018-01-20 23:36:53,220 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:36:53,221 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,221 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:36:53,221 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,221 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:36:53,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:36:53,238 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:36:53,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:36:53,310 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:36:53,310 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-20 23:36:53,310 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:36:53,312 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-20 23:36:53,312 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-20 23:36:53,312 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-20 23:36:53,313 INFO L87 Difference]: Start difference. First operand 119 states and 135 transitions. Second operand 4 states. [2018-01-20 23:36:53,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:36:53,369 INFO L93 Difference]: Finished difference Result 161 states and 183 transitions. [2018-01-20 23:36:53,370 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:36:53,370 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 27 [2018-01-20 23:36:53,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:36:53,373 INFO L225 Difference]: With dead ends: 161 [2018-01-20 23:36:53,373 INFO L226 Difference]: Without dead ends: 156 [2018-01-20 23:36:53,374 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 [2018-01-20 23:36:53,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-01-20 23:36:53,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2018-01-20 23:36:53,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-01-20 23:36:53,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 178 transitions. [2018-01-20 23:36:53,388 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 178 transitions. Word has length 27 [2018-01-20 23:36:53,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:36:53,389 INFO L432 AbstractCegarLoop]: Abstraction has 156 states and 178 transitions. [2018-01-20 23:36:53,389 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-20 23:36:53,389 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 178 transitions. [2018-01-20 23:36:53,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-20 23:36:53,391 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:36:53,392 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] [2018-01-20 23:36:53,392 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:36:53,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1759311448, now seen corresponding path program 1 times [2018-01-20 23:36:53,392 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:36:53,393 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,393 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:36:53,393 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,394 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:36:53,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:36:53,419 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:36:53,458 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:36:53,459 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:36:53,459 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:36:53,459 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:36:53,460 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:36:53,460 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:36:53,460 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:36:53,460 INFO L87 Difference]: Start difference. First operand 156 states and 178 transitions. Second operand 3 states. [2018-01-20 23:36:53,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:36:53,475 INFO L93 Difference]: Finished difference Result 237 states and 273 transitions. [2018-01-20 23:36:53,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:36:53,475 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 44 [2018-01-20 23:36:53,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:36:53,477 INFO L225 Difference]: With dead ends: 237 [2018-01-20 23:36:53,477 INFO L226 Difference]: Without dead ends: 158 [2018-01-20 23:36:53,478 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 [2018-01-20 23:36:53,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2018-01-20 23:36:53,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2018-01-20 23:36:53,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2018-01-20 23:36:53,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 180 transitions. [2018-01-20 23:36:53,489 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 180 transitions. Word has length 44 [2018-01-20 23:36:53,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:36:53,489 INFO L432 AbstractCegarLoop]: Abstraction has 158 states and 180 transitions. [2018-01-20 23:36:53,489 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:36:53,489 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 180 transitions. [2018-01-20 23:36:53,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-20 23:36:53,491 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:36:53,491 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] [2018-01-20 23:36:53,492 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:36:53,492 INFO L82 PathProgramCache]: Analyzing trace with hash -512140811, now seen corresponding path program 1 times [2018-01-20 23:36:53,492 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:36:53,493 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,493 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:36:53,493 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,493 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:36:53,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:36:53,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:36:53,563 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:36:53,574 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:36:53,583 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:36:53,584 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:36:53,600 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:36:53,601 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:36:53,601 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:36:53,601 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:36:53,601 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:36:53,601 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:36:53,601 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:36:53,601 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-20 23:36:53,601 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:36:53,604 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states. [2018-01-20 23:36:53,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-20 23:36:53,605 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:36:53,605 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] [2018-01-20 23:36:53,605 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-20 23:36:53,606 INFO L82 PathProgramCache]: Analyzing trace with hash -769688664, now seen corresponding path program 1 times [2018-01-20 23:36:53,606 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:36:53,607 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,607 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:36:53,607 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,607 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:36:53,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:36:53,617 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:36:53,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:36:53,629 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:36:53,629 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:36:53,629 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:36:53,629 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:36:53,630 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:36:53,630 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:36:53,630 INFO L87 Difference]: Start difference. First operand 122 states. Second operand 2 states. [2018-01-20 23:36:53,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:36:53,635 INFO L93 Difference]: Finished difference Result 216 states and 260 transitions. [2018-01-20 23:36:53,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:36:53,636 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2018-01-20 23:36:53,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:36:53,637 INFO L225 Difference]: With dead ends: 216 [2018-01-20 23:36:53,637 INFO L226 Difference]: Without dead ends: 117 [2018-01-20 23:36:53,638 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 [2018-01-20 23:36:53,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-01-20 23:36:53,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-01-20 23:36:53,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-01-20 23:36:53,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 133 transitions. [2018-01-20 23:36:53,646 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 133 transitions. Word has length 20 [2018-01-20 23:36:53,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:36:53,646 INFO L432 AbstractCegarLoop]: Abstraction has 117 states and 133 transitions. [2018-01-20 23:36:53,646 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:36:53,646 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 133 transitions. [2018-01-20 23:36:53,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-20 23:36:53,647 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:36:53,647 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] [2018-01-20 23:36:53,648 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-20 23:36:53,648 INFO L82 PathProgramCache]: Analyzing trace with hash -403350444, now seen corresponding path program 1 times [2018-01-20 23:36:53,648 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:36:53,649 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,649 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:36:53,649 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,649 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:36:53,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:36:53,660 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:36:53,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:36:53,701 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:36:53,701 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-20 23:36:53,701 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:36:53,702 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-20 23:36:53,702 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-20 23:36:53,702 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-20 23:36:53,702 INFO L87 Difference]: Start difference. First operand 117 states and 133 transitions. Second operand 4 states. [2018-01-20 23:36:53,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:36:53,767 INFO L93 Difference]: Finished difference Result 157 states and 179 transitions. [2018-01-20 23:36:53,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:36:53,807 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2018-01-20 23:36:53,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:36:53,809 INFO L225 Difference]: With dead ends: 157 [2018-01-20 23:36:53,809 INFO L226 Difference]: Without dead ends: 154 [2018-01-20 23:36:53,809 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 [2018-01-20 23:36:53,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-01-20 23:36:53,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-01-20 23:36:53,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-01-20 23:36:53,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 176 transitions. [2018-01-20 23:36:53,819 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 176 transitions. Word has length 25 [2018-01-20 23:36:53,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:36:53,820 INFO L432 AbstractCegarLoop]: Abstraction has 154 states and 176 transitions. [2018-01-20 23:36:53,820 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-20 23:36:53,820 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 176 transitions. [2018-01-20 23:36:53,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-20 23:36:53,822 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:36:53,822 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] [2018-01-20 23:36:53,822 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-20 23:36:53,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1941493352, now seen corresponding path program 1 times [2018-01-20 23:36:53,822 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:36:53,823 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,823 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:36:53,824 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,824 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:36:53,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:36:53,838 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:36:53,855 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:36:53,855 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:36:53,855 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:36:53,856 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:36:53,856 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:36:53,856 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:36:53,856 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:36:53,856 INFO L87 Difference]: Start difference. First operand 154 states and 176 transitions. Second operand 3 states. [2018-01-20 23:36:53,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:36:53,867 INFO L93 Difference]: Finished difference Result 233 states and 269 transitions. [2018-01-20 23:36:53,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:36:53,868 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 42 [2018-01-20 23:36:53,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:36:53,869 INFO L225 Difference]: With dead ends: 233 [2018-01-20 23:36:53,869 INFO L226 Difference]: Without dead ends: 156 [2018-01-20 23:36:53,870 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 [2018-01-20 23:36:53,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-01-20 23:36:53,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2018-01-20 23:36:53,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-01-20 23:36:53,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 178 transitions. [2018-01-20 23:36:53,878 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 178 transitions. Word has length 42 [2018-01-20 23:36:53,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:36:53,878 INFO L432 AbstractCegarLoop]: Abstraction has 156 states and 178 transitions. [2018-01-20 23:36:53,878 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:36:53,879 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 178 transitions. [2018-01-20 23:36:53,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-20 23:36:53,880 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:36:53,880 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] [2018-01-20 23:36:53,880 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-20 23:36:53,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1818459461, now seen corresponding path program 1 times [2018-01-20 23:36:53,881 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:36:53,881 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,882 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:36:53,882 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:36:53,882 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:36:53,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:36:53,899 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:36:54,525 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:36:54,526 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:36:54,526 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:36:54,527 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 45 with the following transitions: [2018-01-20 23:36:54,529 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] [2018-01-20 23:36:54,585 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:36:54,585 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