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/forester-heap/dll-queue_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 00:07:11,159 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 00:07:11,162 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 00:07:11,175 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 00:07:11,176 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 00:07:11,177 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 00:07:11,178 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 00:07:11,179 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 00:07:11,180 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 00:07:11,181 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 00:07:11,181 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-01-21 00:07:11,204 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 [2018-01-21 00:07:11,214 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 00:07:11,215 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 00:07:11,215 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 00:07:11,216 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 00:07:11,216 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 00:07:11,216 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 00:07:11,216 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 00:07:11,217 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 00:07:11,217 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 00:07:11,217 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 00:07:11,218 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 00:07:11,218 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 00:07:11,218 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 00:07:11,218 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 00:07:11,218 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 00:07:11,218 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 00:07:11,219 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 00:07:11,219 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 00:07:11,219 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 00:07:11,219 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 00:07:11,219 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 00:07:11,220 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 00:07:11,220 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 00:07:11,220 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 00:07:11,220 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 00:07:11,220 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 00:07:11,221 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 00:07:11,221 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 00:07:11,221 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 00:07:11,221 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 00:07:11,221 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 00:07:11,222 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 00:07:11,222 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 00:07:11,222 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 00:07:11,222 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 00:07:11,222 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 00:07:11,223 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 00:07:11,223 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 00:07:11,260 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 00:07:11,274 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 00:07:11,279 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 00:07:11,280 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 00:07:11,281 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 00:07:11,282 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/dll-queue_true-unreach-call_true-valid-memsafety.i [2018-01-21 00:07:11,475 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 00:07:11,480 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 00:07:11,480 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 00:07:11,481 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 00:07:11,486 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 00:07:11,487 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:07:11" (1/1) ... [2018-01-21 00:07:11,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39c1589c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11, skipping insertion in model container [2018-01-21 00:07:11,490 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:07:11" (1/1) ... [2018-01-21 00:07:11,504 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:07:11,546 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:07:11,669 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:07:11,692 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:07:11,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11 WrapperNode [2018-01-21 00:07:11,703 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 00:07:11,704 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 00:07:11,704 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 00:07:11,705 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 00:07:11,722 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11" (1/1) ... [2018-01-21 00:07:11,722 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11" (1/1) ... [2018-01-21 00:07:11,734 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11" (1/1) ... [2018-01-21 00:07:11,734 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11" (1/1) ... [2018-01-21 00:07:11,740 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11" (1/1) ... [2018-01-21 00:07:11,746 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11" (1/1) ... [2018-01-21 00:07:11,747 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11" (1/1) ... [2018-01-21 00:07:11,750 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 00:07:11,750 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 00:07:11,750 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 00:07:11,750 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 00:07:11,752 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11" (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 00:07:11,800 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 00:07:11,800 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 00:07:11,800 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 00:07:11,800 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 00:07:11,801 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 00:07:11,801 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 00:07:11,801 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 00:07:11,801 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 00:07:11,801 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 00:07:11,801 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 00:07:11,801 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 00:07:11,801 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 00:07:11,801 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 00:07:11,802 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 00:07:11,802 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 00:07:11,802 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 00:07:11,802 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 00:07:12,225 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 00:07:12,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:07:12 BoogieIcfgContainer [2018-01-21 00:07:12,226 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 00:07:12,228 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 00:07:12,228 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 00:07:12,230 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 00:07:12,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 12:07:11" (1/3) ... [2018-01-21 00:07:12,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10a857eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:07:12, skipping insertion in model container [2018-01-21 00:07:12,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:07:11" (2/3) ... [2018-01-21 00:07:12,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10a857eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:07:12, skipping insertion in model container [2018-01-21 00:07:12,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:07:12" (3/3) ... [2018-01-21 00:07:12,234 INFO L105 eAbstractionObserver]: Analyzing ICFG dll-queue_true-unreach-call_true-valid-memsafety.i [2018-01-21 00:07:12,242 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 00:07:12,249 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 00:07:12,292 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:07:12,293 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:07:12,293 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:07:12,293 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:07:12,293 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:07:12,293 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:07:12,293 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:07:12,293 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 00:07:12,294 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:07:12,313 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states. [2018-01-21 00:07:12,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 00:07:12,319 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:07:12,320 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 00:07:12,320 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 00:07:12,324 INFO L82 PathProgramCache]: Analyzing trace with hash 407902, now seen corresponding path program 1 times [2018-01-21 00:07:12,326 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:07:12,369 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:12,369 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:07:12,370 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:12,370 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:07:12,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:07:12,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:07:12,430 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 00:07:12,437 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:07:12,445 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:07:12,445 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:07:12,446 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:07:12,446 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:07:12,446 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:07:12,446 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:07:12,446 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:07:12,446 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 00:07:12,446 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:07:12,450 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states. [2018-01-21 00:07:12,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 00:07:12,454 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:07:12,454 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] [2018-01-21 00:07:12,454 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:07:12,455 INFO L82 PathProgramCache]: Analyzing trace with hash 2026048430, now seen corresponding path program 1 times [2018-01-21 00:07:12,455 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:07:12,456 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:12,457 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:07:12,457 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:12,457 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:07:12,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:07:12,490 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:07:12,612 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 00:07:12,614 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:07:12,614 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:07:12,614 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:07:12,618 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:07:12,630 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:07:12,631 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:07:12,633 INFO L87 Difference]: Start difference. First operand 114 states. Second operand 2 states. [2018-01-21 00:07:12,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:07:12,666 INFO L93 Difference]: Finished difference Result 216 states and 326 transitions. [2018-01-21 00:07:12,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:07:12,667 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 24 [2018-01-21 00:07:12,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:07:12,682 INFO L225 Difference]: With dead ends: 216 [2018-01-21 00:07:12,682 INFO L226 Difference]: Without dead ends: 111 [2018-01-21 00:07:12,686 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 00:07:12,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-01-21 00:07:12,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2018-01-21 00:07:12,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-01-21 00:07:12,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 121 transitions. [2018-01-21 00:07:12,732 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 121 transitions. Word has length 24 [2018-01-21 00:07:12,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:07:12,733 INFO L432 AbstractCegarLoop]: Abstraction has 111 states and 121 transitions. [2018-01-21 00:07:12,733 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:07:12,733 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 121 transitions. [2018-01-21 00:07:12,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 00:07:12,735 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:07:12,736 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] [2018-01-21 00:07:12,736 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:07:12,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1986375214, now seen corresponding path program 1 times [2018-01-21 00:07:12,736 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:07:12,737 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:12,738 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:07:12,738 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:12,738 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:07:12,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:07:12,773 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:07:13,011 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 00:07:13,012 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:07:13,012 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 00:07:13,012 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:07:13,014 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 00:07:13,015 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 00:07:13,015 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-01-21 00:07:13,015 INFO L87 Difference]: Start difference. First operand 111 states and 121 transitions. Second operand 6 states. [2018-01-21 00:07:13,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:07:13,309 INFO L93 Difference]: Finished difference Result 202 states and 223 transitions. [2018-01-21 00:07:13,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 00:07:13,309 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2018-01-21 00:07:13,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:07:13,314 INFO L225 Difference]: With dead ends: 202 [2018-01-21 00:07:13,314 INFO L226 Difference]: Without dead ends: 180 [2018-01-21 00:07:13,315 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-01-21 00:07:13,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-01-21 00:07:13,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 170. [2018-01-21 00:07:13,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-01-21 00:07:13,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 184 transitions. [2018-01-21 00:07:13,333 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 184 transitions. Word has length 32 [2018-01-21 00:07:13,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:07:13,334 INFO L432 AbstractCegarLoop]: Abstraction has 170 states and 184 transitions. [2018-01-21 00:07:13,334 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 00:07:13,334 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 184 transitions. [2018-01-21 00:07:13,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 00:07:13,336 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:07:13,336 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] [2018-01-21 00:07:13,336 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:07:13,336 INFO L82 PathProgramCache]: Analyzing trace with hash 1177028588, now seen corresponding path program 1 times [2018-01-21 00:07:13,337 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:07:13,338 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,338 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:07:13,338 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,338 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:07:13,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:07:13,357 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:07:13,412 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 00:07:13,412 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:07:13,413 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 00:07:13,413 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:07:13,413 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 00:07:13,413 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 00:07:13,414 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 00:07:13,414 INFO L87 Difference]: Start difference. First operand 170 states and 184 transitions. Second operand 4 states. [2018-01-21 00:07:13,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:07:13,493 INFO L93 Difference]: Finished difference Result 179 states and 193 transitions. [2018-01-21 00:07:13,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 00:07:13,493 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 32 [2018-01-21 00:07:13,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:07:13,496 INFO L225 Difference]: With dead ends: 179 [2018-01-21 00:07:13,496 INFO L226 Difference]: Without dead ends: 174 [2018-01-21 00:07:13,497 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 00:07:13,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-01-21 00:07:13,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 172. [2018-01-21 00:07:13,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-01-21 00:07:13,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 186 transitions. [2018-01-21 00:07:13,515 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 186 transitions. Word has length 32 [2018-01-21 00:07:13,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:07:13,516 INFO L432 AbstractCegarLoop]: Abstraction has 172 states and 186 transitions. [2018-01-21 00:07:13,516 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 00:07:13,516 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 186 transitions. [2018-01-21 00:07:13,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 00:07:13,518 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:07:13,518 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] [2018-01-21 00:07:13,518 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:07:13,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1123303454, now seen corresponding path program 1 times [2018-01-21 00:07:13,519 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:07:13,520 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,520 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:07:13,520 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,520 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:07:13,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:07:13,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:07:13,571 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 00:07:13,580 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:07:13,586 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:07:13,587 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:07:13,602 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:07:13,602 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:07:13,602 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:07:13,602 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:07:13,602 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:07:13,602 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:07:13,603 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:07:13,603 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 00:07:13,603 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:07:13,605 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states. [2018-01-21 00:07:13,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 00:07:13,607 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:07:13,607 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:07:13,607 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 00:07:13,608 INFO L82 PathProgramCache]: Analyzing trace with hash 46800947, now seen corresponding path program 1 times [2018-01-21 00:07:13,608 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:07:13,609 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,609 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:07:13,609 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,609 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:07:13,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:07:13,620 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:07:13,632 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 00:07:13,632 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:07:13,632 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:07:13,632 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:07:13,633 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:07:13,633 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:07:13,633 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:07:13,633 INFO L87 Difference]: Start difference. First operand 114 states. Second operand 2 states. [2018-01-21 00:07:13,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:07:13,640 INFO L93 Difference]: Finished difference Result 216 states and 326 transitions. [2018-01-21 00:07:13,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:07:13,640 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-01-21 00:07:13,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:07:13,641 INFO L225 Difference]: With dead ends: 216 [2018-01-21 00:07:13,642 INFO L226 Difference]: Without dead ends: 109 [2018-01-21 00:07:13,642 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 00:07:13,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-01-21 00:07:13,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-01-21 00:07:13,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-01-21 00:07:13,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 119 transitions. [2018-01-21 00:07:13,650 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 119 transitions. Word has length 22 [2018-01-21 00:07:13,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:07:13,651 INFO L432 AbstractCegarLoop]: Abstraction has 109 states and 119 transitions. [2018-01-21 00:07:13,651 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:07:13,651 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 119 transitions. [2018-01-21 00:07:13,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 00:07:13,653 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:07:13,653 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] [2018-01-21 00:07:13,653 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 00:07:13,653 INFO L82 PathProgramCache]: Analyzing trace with hash 364077747, now seen corresponding path program 1 times [2018-01-21 00:07:13,653 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:07:13,654 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,654 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:07:13,654 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,654 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:07:13,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:07:13,667 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:07:13,779 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 00:07:13,779 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:07:13,779 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 00:07:13,779 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:07:13,780 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 00:07:13,780 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 00:07:13,780 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-01-21 00:07:13,780 INFO L87 Difference]: Start difference. First operand 109 states and 119 transitions. Second operand 6 states. [2018-01-21 00:07:13,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:07:13,953 INFO L93 Difference]: Finished difference Result 198 states and 218 transitions. [2018-01-21 00:07:13,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 00:07:13,953 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2018-01-21 00:07:13,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:07:13,955 INFO L225 Difference]: With dead ends: 198 [2018-01-21 00:07:13,955 INFO L226 Difference]: Without dead ends: 178 [2018-01-21 00:07:13,955 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-01-21 00:07:13,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-01-21 00:07:13,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 168. [2018-01-21 00:07:13,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-01-21 00:07:13,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 182 transitions. [2018-01-21 00:07:13,966 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 182 transitions. Word has length 30 [2018-01-21 00:07:13,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:07:13,967 INFO L432 AbstractCegarLoop]: Abstraction has 168 states and 182 transitions. [2018-01-21 00:07:13,967 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 00:07:13,967 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 182 transitions. [2018-01-21 00:07:13,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 00:07:13,969 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:07:13,969 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] [2018-01-21 00:07:13,969 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 00:07:13,969 INFO L82 PathProgramCache]: Analyzing trace with hash 421336049, now seen corresponding path program 1 times [2018-01-21 00:07:13,969 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:07:13,970 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,971 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:07:13,971 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:13,971 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:07:13,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:07:13,980 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:07:14,026 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 00:07:14,027 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:07:14,027 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 00:07:14,028 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:07:14,029 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 00:07:14,029 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 00:07:14,029 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 00:07:14,029 INFO L87 Difference]: Start difference. First operand 168 states and 182 transitions. Second operand 4 states. [2018-01-21 00:07:14,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:07:14,156 INFO L93 Difference]: Finished difference Result 175 states and 189 transitions. [2018-01-21 00:07:14,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 00:07:14,157 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 30 [2018-01-21 00:07:14,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:07:14,158 INFO L225 Difference]: With dead ends: 175 [2018-01-21 00:07:14,158 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 00:07:14,159 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 00:07:14,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 00:07:14,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 170. [2018-01-21 00:07:14,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-01-21 00:07:14,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 184 transitions. [2018-01-21 00:07:14,169 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 184 transitions. Word has length 30 [2018-01-21 00:07:14,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:07:14,170 INFO L432 AbstractCegarLoop]: Abstraction has 170 states and 184 transitions. [2018-01-21 00:07:14,170 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 00:07:14,170 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 184 transitions. [2018-01-21 00:07:14,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-21 00:07:14,171 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:07:14,171 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] [2018-01-21 00:07:14,171 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 00:07:14,171 INFO L82 PathProgramCache]: Analyzing trace with hash -1281511261, now seen corresponding path program 1 times [2018-01-21 00:07:14,172 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:07:14,172 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:14,173 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:07:14,173 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:07:14,173 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:07:14,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:07:14,184 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:07:14,303 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:07:14,303 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:07:14,303 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:07:14,304 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 36 with the following transitions: [2018-01-21 00:07:14,306 INFO L201 CegarAbsIntRunner]: [0], [1], [2], [3], [4], [5], [9], [11], [14], [86], [91], [95], [141], [202], [304], [306], [307], [311], [313], [318], [322], [358], [362], [364], [365], [366], [367], [371], [373], [374], [375], [381], [382], [383] [2018-01-21 00:07:14,361 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:07:14,361 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:07:38,545 INFO L262 AbstractInterpreter]: Error location(s) were unreachable [2018-01-21 00:07:38,547 INFO L268 AbstractInterpreter]: Visited 34 different actions 37 times. Merged at 2 different actions 2 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 29 variables. [2018-01-21 00:07:38,565 INFO L395 sIntCurrentIteration]: Generating AbsInt predicates Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown