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_mostprecise.epf -i ../../../trunk/examples/svcomp/memsafety/lockfree-3.3_false-valid-memtrack.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 02:54:47,401 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 02:54:47,403 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 02:54:47,426 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 02:54:47,426 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 02:54:47,427 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 02:54:47,428 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 02:54:47,430 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 02:54:47,433 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 02:54:47,434 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 02:54:47,435 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 02:54:47,436 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 02:54:47,437 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 02:54:47,438 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 02:54:47,439 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 02:54:47,442 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 02:54:47,445 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 02:54:47,447 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 02:54:47,448 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 02:54:47,450 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 02:54:47,452 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 02:54:47,452 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 02:54:47,453 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 02:54:47,454 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 02:54:47,455 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 02:54:47,456 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 02:54:47,456 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 02:54:47,457 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 02:54:47,460 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 02:54:47,460 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 02:54:47,461 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 02:54:47,462 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_mostprecise.epf [2018-01-21 02:54:47,476 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 02:54:47,480 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 02:54:47,481 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 02:54:47,481 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 02:54:47,482 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 02:54:47,482 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 02:54:47,482 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 02:54:47,482 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 02:54:47,482 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 02:54:47,483 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 02:54:47,483 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 02:54:47,484 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 02:54:47,484 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 02:54:47,485 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 02:54:47,485 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 02:54:47,485 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 02:54:47,485 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 02:54:47,485 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 02:54:47,486 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 02:54:47,486 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 02:54:47,486 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 02:54:47,486 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 02:54:47,486 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 02:54:47,487 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 02:54:47,487 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 02:54:47,487 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 02:54:47,487 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 02:54:47,487 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 02:54:47,488 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 02:54:47,488 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 02:54:47,490 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 02:54:47,490 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 02:54:47,490 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 02:54:47,490 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 02:54:47,490 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 02:54:47,491 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 02:54:47,491 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 02:54:47,491 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 02:54:47,492 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 02:54:47,492 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 02:54:47,559 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 02:54:47,595 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 02:54:47,608 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 02:54:47,611 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 02:54:47,612 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 02:54:47,613 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/memsafety/lockfree-3.3_false-valid-memtrack.i [2018-01-21 02:54:47,864 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 02:54:47,869 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 02:54:47,870 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 02:54:47,870 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 02:54:47,876 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 02:54:47,877 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 02:54:47" (1/1) ... [2018-01-21 02:54:47,879 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b942210 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:47, skipping insertion in model container [2018-01-21 02:54:47,879 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 02:54:47" (1/1) ... [2018-01-21 02:54:47,892 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 02:54:47,931 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 02:54:48,059 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 02:54:48,085 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 02:54:48,095 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48 WrapperNode [2018-01-21 02:54:48,095 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 02:54:48,096 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 02:54:48,096 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 02:54:48,096 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 02:54:48,110 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48" (1/1) ... [2018-01-21 02:54:48,110 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48" (1/1) ... [2018-01-21 02:54:48,120 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48" (1/1) ... [2018-01-21 02:54:48,120 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48" (1/1) ... [2018-01-21 02:54:48,128 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48" (1/1) ... [2018-01-21 02:54:48,133 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48" (1/1) ... [2018-01-21 02:54:48,135 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48" (1/1) ... [2018-01-21 02:54:48,138 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 02:54:48,139 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 02:54:48,139 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 02:54:48,139 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 02:54:48,140 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48" (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 02:54:48,194 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 02:54:48,195 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 02:54:48,195 INFO L136 BoogieDeclarations]: Found implementation of procedure push [2018-01-21 02:54:48,195 INFO L136 BoogieDeclarations]: Found implementation of procedure pop [2018-01-21 02:54:48,195 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 02:54:48,195 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 02:54:48,196 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 02:54:48,196 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 02:54:48,196 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 02:54:48,196 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 02:54:48,196 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 02:54:48,197 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 02:54:48,197 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 02:54:48,197 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 02:54:48,197 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 02:54:48,197 INFO L128 BoogieDeclarations]: Found specification of procedure push [2018-01-21 02:54:48,197 INFO L128 BoogieDeclarations]: Found specification of procedure pop [2018-01-21 02:54:48,197 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 02:54:48,198 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 02:54:48,198 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 02:54:48,481 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 02:54:48,482 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 02:54:48 BoogieIcfgContainer [2018-01-21 02:54:48,482 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 02:54:48,483 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 02:54:48,484 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 02:54:48,486 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 02:54:48,486 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 02:54:47" (1/3) ... [2018-01-21 02:54:48,487 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ce304a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 02:54:48, skipping insertion in model container [2018-01-21 02:54:48,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 02:54:48" (2/3) ... [2018-01-21 02:54:48,487 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ce304a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 02:54:48, skipping insertion in model container [2018-01-21 02:54:48,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 02:54:48" (3/3) ... [2018-01-21 02:54:48,489 INFO L105 eAbstractionObserver]: Analyzing ICFG lockfree-3.3_false-valid-memtrack.i [2018-01-21 02:54:48,495 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 02:54:48,503 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 5 error locations. [2018-01-21 02:54:48,540 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 02:54:48,541 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 02:54:48,541 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 02:54:48,541 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 02:54:48,541 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 02:54:48,541 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 02:54:48,541 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 02:54:48,541 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == popErr0EnsuresViolation======== [2018-01-21 02:54:48,542 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 02:54:48,558 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 02:54:48,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-01-21 02:54:48,565 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:48,566 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:48,566 INFO L371 AbstractCegarLoop]: === Iteration 1 === [popErr0EnsuresViolation]=== [2018-01-21 02:54:48,570 INFO L82 PathProgramCache]: Analyzing trace with hash 816843792, now seen corresponding path program 1 times [2018-01-21 02:54:48,572 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:48,613 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:48,614 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:48,614 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:48,614 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:48,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 02:54:48,699 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 02:54:48,758 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 02:54:48,761 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 02:54:48,761 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2018-01-21 02:54:48,761 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 02:54:48,764 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 02:54:48,774 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 02:54:48,775 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 02:54:48,777 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 02:54:48,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 02:54:48,890 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2018-01-21 02:54:48,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 02:54:48,891 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-01-21 02:54:48,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 02:54:48,900 INFO L225 Difference]: With dead ends: 75 [2018-01-21 02:54:48,900 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 02:54:48,904 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 1 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 02:54:48,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 02:54:48,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 02:54:48,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 02:54:48,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 02:54:48,934 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 14 [2018-01-21 02:54:48,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 02:54:48,934 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 02:54:48,934 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 02:54:48,934 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 02:54:48,934 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 02:54:48,940 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-01-21 02:54:48,973 INFO L401 ceAbstractionStarter]: For program point L681(line 681) no Hoare annotation was computed. [2018-01-21 02:54:48,973 INFO L401 ceAbstractionStarter]: For program point L680(line 680) no Hoare annotation was computed. [2018-01-21 02:54:48,973 INFO L401 ceAbstractionStarter]: For program point popEXIT(lines 660 687) no Hoare annotation was computed. [2018-01-21 02:54:48,973 INFO L401 ceAbstractionStarter]: For program point L663(lines 663 686) no Hoare annotation was computed. [2018-01-21 02:54:48,973 INFO L404 ceAbstractionStarter]: At program point popENTRY(lines 660 687) the Hoare annotation is: true [2018-01-21 02:54:48,974 INFO L401 ceAbstractionStarter]: For program point L682(line 682) no Hoare annotation was computed. [2018-01-21 02:54:48,974 INFO L401 ceAbstractionStarter]: For program point L667(line 667) no Hoare annotation was computed. [2018-01-21 02:54:48,974 INFO L401 ceAbstractionStarter]: For program point L672'(line 672) no Hoare annotation was computed. [2018-01-21 02:54:48,974 INFO L401 ceAbstractionStarter]: For program point L664(line 664) no Hoare annotation was computed. [2018-01-21 02:54:48,974 INFO L401 ceAbstractionStarter]: For program point L682'(line 682) no Hoare annotation was computed. [2018-01-21 02:54:48,974 INFO L401 ceAbstractionStarter]: For program point L668(lines 668 669) no Hoare annotation was computed. [2018-01-21 02:54:48,975 INFO L401 ceAbstractionStarter]: For program point L674(line 674) no Hoare annotation was computed. [2018-01-21 02:54:48,975 INFO L401 ceAbstractionStarter]: For program point L672(line 672) no Hoare annotation was computed. [2018-01-21 02:54:48,975 INFO L401 ceAbstractionStarter]: For program point L671(line 671) no Hoare annotation was computed. [2018-01-21 02:54:48,975 INFO L401 ceAbstractionStarter]: For program point L675(lines 675 678) no Hoare annotation was computed. [2018-01-21 02:54:48,975 INFO L401 ceAbstractionStarter]: For program point L675''(lines 675 678) no Hoare annotation was computed. [2018-01-21 02:54:48,975 INFO L401 ceAbstractionStarter]: For program point L681'(line 681) no Hoare annotation was computed. [2018-01-21 02:54:48,975 INFO L401 ceAbstractionStarter]: For program point popErr0EnsuresViolation(lines 660 687) no Hoare annotation was computed. [2018-01-21 02:54:48,975 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initErr0EnsuresViolation(lines 1 707) no Hoare annotation was computed. [2018-01-21 02:54:48,976 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(lines 1 707) no Hoare annotation was computed. [2018-01-21 02:54:48,976 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.initENTRY(lines 1 707) the Hoare annotation is: true [2018-01-21 02:54:48,976 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initFINAL(lines 1 707) no Hoare annotation was computed. [2018-01-21 02:54:48,976 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(lines 1 707) the Hoare annotation is: true [2018-01-21 02:54:48,976 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(lines 1 707) no Hoare annotation was computed. [2018-01-21 02:54:48,976 INFO L404 ceAbstractionStarter]: At program point L1(lines 1 707) the Hoare annotation is: true [2018-01-21 02:54:48,977 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startErr0EnsuresViolation(lines 1 707) no Hoare annotation was computed. [2018-01-21 02:54:48,977 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(lines 1 707) no Hoare annotation was computed. [2018-01-21 02:54:48,977 INFO L404 ceAbstractionStarter]: At program point L694'(line 694) the Hoare annotation is: true [2018-01-21 02:54:48,977 INFO L401 ceAbstractionStarter]: For program point L690'(line 690) no Hoare annotation was computed. [2018-01-21 02:54:48,977 INFO L401 ceAbstractionStarter]: For program point L697'(line 697) no Hoare annotation was computed. [2018-01-21 02:54:48,977 INFO L401 ceAbstractionStarter]: For program point L696'''(lines 696 700) no Hoare annotation was computed. [2018-01-21 02:54:48,977 INFO L401 ceAbstractionStarter]: For program point L690'''(line 690) no Hoare annotation was computed. [2018-01-21 02:54:48,978 INFO L401 ceAbstractionStarter]: For program point mainErr0EnsuresViolation(lines 688 707) no Hoare annotation was computed. [2018-01-21 02:54:48,978 INFO L404 ceAbstractionStarter]: At program point L692(line 692) the Hoare annotation is: true [2018-01-21 02:54:48,978 INFO L401 ceAbstractionStarter]: For program point L691(lines 691 694) no Hoare annotation was computed. [2018-01-21 02:54:48,978 INFO L401 ceAbstractionStarter]: For program point L690(lines 690 695) no Hoare annotation was computed. [2018-01-21 02:54:48,978 INFO L401 ceAbstractionStarter]: For program point L696(lines 696 700) no Hoare annotation was computed. [2018-01-21 02:54:48,978 INFO L401 ceAbstractionStarter]: For program point L696''(lines 696 700) no Hoare annotation was computed. [2018-01-21 02:54:48,979 INFO L404 ceAbstractionStarter]: At program point L694(line 694) the Hoare annotation is: true [2018-01-21 02:54:48,979 INFO L401 ceAbstractionStarter]: For program point mainFINAL(lines 688 707) no Hoare annotation was computed. [2018-01-21 02:54:48,979 INFO L401 ceAbstractionStarter]: For program point L698(line 698) no Hoare annotation was computed. [2018-01-21 02:54:48,979 INFO L401 ceAbstractionStarter]: For program point L697(line 697) no Hoare annotation was computed. [2018-01-21 02:54:48,979 INFO L401 ceAbstractionStarter]: For program point mainEXIT(lines 688 707) no Hoare annotation was computed. [2018-01-21 02:54:48,979 INFO L401 ceAbstractionStarter]: For program point L698'(line 698) no Hoare annotation was computed. [2018-01-21 02:54:48,979 INFO L401 ceAbstractionStarter]: For program point L640(line 640) no Hoare annotation was computed. [2018-01-21 02:54:48,979 INFO L401 ceAbstractionStarter]: For program point L644(line 644) no Hoare annotation was computed. [2018-01-21 02:54:48,980 INFO L401 ceAbstractionStarter]: For program point L643(line 643) no Hoare annotation was computed. [2018-01-21 02:54:48,980 INFO L401 ceAbstractionStarter]: For program point L647''(lines 647 650) no Hoare annotation was computed. [2018-01-21 02:54:48,980 INFO L401 ceAbstractionStarter]: For program point L647(lines 647 650) no Hoare annotation was computed. [2018-01-21 02:54:48,980 INFO L401 ceAbstractionStarter]: For program point L646(line 646) no Hoare annotation was computed. [2018-01-21 02:54:48,980 INFO L401 ceAbstractionStarter]: For program point L633'(line 633) no Hoare annotation was computed. [2018-01-21 02:54:48,981 INFO L404 ceAbstractionStarter]: At program point pushENTRY(lines 629 656) the Hoare annotation is: true [2018-01-21 02:54:48,981 INFO L401 ceAbstractionStarter]: For program point L652(line 652) no Hoare annotation was computed. [2018-01-21 02:54:48,981 INFO L401 ceAbstractionStarter]: For program point pushErr0EnsuresViolation(lines 629 656) no Hoare annotation was computed. [2018-01-21 02:54:48,981 INFO L401 ceAbstractionStarter]: For program point L634(line 634) no Hoare annotation was computed. [2018-01-21 02:54:48,981 INFO L401 ceAbstractionStarter]: For program point L633(line 633) no Hoare annotation was computed. [2018-01-21 02:54:48,981 INFO L401 ceAbstractionStarter]: For program point L632(line 632) no Hoare annotation was computed. [2018-01-21 02:54:48,982 INFO L401 ceAbstractionStarter]: For program point L631(lines 631 655) no Hoare annotation was computed. [2018-01-21 02:54:48,982 INFO L401 ceAbstractionStarter]: For program point L638(line 638) no Hoare annotation was computed. [2018-01-21 02:54:48,982 INFO L401 ceAbstractionStarter]: For program point pushEXIT(lines 629 656) no Hoare annotation was computed. [2018-01-21 02:54:48,982 INFO L401 ceAbstractionStarter]: For program point L637(line 637) no Hoare annotation was computed. [2018-01-21 02:54:48,982 INFO L401 ceAbstractionStarter]: For program point L634'(line 634) no Hoare annotation was computed. [2018-01-21 02:54:48,986 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 02:54:48,986 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 02:54:48,986 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 02:54:48,987 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 02:54:48,987 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 02:54:48,987 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 02:54:48,987 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 02:54:48,987 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 02:54:48,987 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 02:54:48,990 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 02:54:48,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 02:54:48,990 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:48,990 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 02:54:48,991 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 02:54:48,991 INFO L82 PathProgramCache]: Analyzing trace with hash 169454, now seen corresponding path program 1 times [2018-01-21 02:54:48,991 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:48,992 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:48,992 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:48,992 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:48,993 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:49,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 02:54:49,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 02:54:49,044 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 02:54:49,051 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 02:54:49,060 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 02:54:49,060 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 02:54:49,060 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 02:54:49,060 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 02:54:49,060 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 02:54:49,061 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 02:54:49,061 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 02:54:49,061 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 02:54:49,061 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 02:54:49,062 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 02:54:49,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-01-21 02:54:49,063 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:49,064 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:49,064 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 02:54:49,064 INFO L82 PathProgramCache]: Analyzing trace with hash 1316586551, now seen corresponding path program 1 times [2018-01-21 02:54:49,064 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:49,065 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,065 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:49,065 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,065 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:49,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 02:54:49,080 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 02:54:49,096 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 02:54:49,097 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 02:54:49,097 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 02:54:49,097 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 02:54:49,097 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 02:54:49,097 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 02:54:49,098 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 02:54:49,098 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 02:54:49,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 02:54:49,104 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2018-01-21 02:54:49,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 02:54:49,104 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-01-21 02:54:49,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 02:54:49,111 INFO L225 Difference]: With dead ends: 75 [2018-01-21 02:54:49,112 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 02:54:49,112 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 02:54:49,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 02:54:49,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-01-21 02:54:49,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 02:54:49,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 74 transitions. [2018-01-21 02:54:49,129 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 74 transitions. Word has length 11 [2018-01-21 02:54:49,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 02:54:49,129 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 74 transitions. [2018-01-21 02:54:49,130 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 02:54:49,130 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 74 transitions. [2018-01-21 02:54:49,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 02:54:49,131 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:49,131 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:49,131 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 02:54:49,131 INFO L82 PathProgramCache]: Analyzing trace with hash -2092868013, now seen corresponding path program 1 times [2018-01-21 02:54:49,131 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:49,133 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,133 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:49,133 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,133 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:49,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 02:54:49,150 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 02:54:49,182 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 02:54:49,182 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 02:54:49,183 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 02:54:49,183 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 02:54:49,184 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 02:54:49,185 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 02:54:49,185 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 02:54:49,185 INFO L87 Difference]: Start difference. First operand 57 states and 74 transitions. Second operand 3 states. [2018-01-21 02:54:49,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 02:54:49,207 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2018-01-21 02:54:49,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 02:54:49,208 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-01-21 02:54:49,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 02:54:49,209 INFO L225 Difference]: With dead ends: 69 [2018-01-21 02:54:49,209 INFO L226 Difference]: Without dead ends: 58 [2018-01-21 02:54:49,210 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 02:54:49,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-01-21 02:54:49,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-01-21 02:54:49,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 02:54:49,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 75 transitions. [2018-01-21 02:54:49,216 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 75 transitions. Word has length 15 [2018-01-21 02:54:49,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 02:54:49,216 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 75 transitions. [2018-01-21 02:54:49,216 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 02:54:49,216 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 75 transitions. [2018-01-21 02:54:49,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 02:54:49,217 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:49,217 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:49,217 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 02:54:49,217 INFO L82 PathProgramCache]: Analyzing trace with hash 1392752657, now seen corresponding path program 1 times [2018-01-21 02:54:49,217 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:49,218 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,218 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:49,218 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,218 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:49,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 02:54:49,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 02:54:49,269 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 02:54:49,278 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 02:54:49,286 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 02:54:49,287 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 02:54:49,298 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 02:54:49,298 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 02:54:49,298 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 02:54:49,299 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 02:54:49,299 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 02:54:49,299 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 02:54:49,299 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 02:54:49,299 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 02:54:49,299 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 02:54:49,301 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 02:54:49,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-01-21 02:54:49,302 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:49,302 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:49,302 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 02:54:49,302 INFO L82 PathProgramCache]: Analyzing trace with hash 1784608256, now seen corresponding path program 1 times [2018-01-21 02:54:49,302 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:49,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,303 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:49,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,304 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:49,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 02:54:49,313 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 02:54:49,323 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 02:54:49,323 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 02:54:49,323 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 02:54:49,324 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 02:54:49,324 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 02:54:49,324 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 02:54:49,324 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 02:54:49,325 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 02:54:49,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 02:54:49,330 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2018-01-21 02:54:49,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 02:54:49,330 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2018-01-21 02:54:49,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 02:54:49,331 INFO L225 Difference]: With dead ends: 75 [2018-01-21 02:54:49,331 INFO L226 Difference]: Without dead ends: 55 [2018-01-21 02:54:49,332 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 02:54:49,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-21 02:54:49,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-01-21 02:54:49,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-21 02:54:49,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 72 transitions. [2018-01-21 02:54:49,339 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 72 transitions. Word has length 9 [2018-01-21 02:54:49,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 02:54:49,339 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 72 transitions. [2018-01-21 02:54:49,339 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 02:54:49,339 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 72 transitions. [2018-01-21 02:54:49,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-01-21 02:54:49,340 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:49,340 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:49,341 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 02:54:49,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1548658460, now seen corresponding path program 1 times [2018-01-21 02:54:49,341 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:49,342 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,342 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:49,342 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,342 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:49,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 02:54:49,351 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 02:54:49,385 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 02:54:49,385 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 02:54:49,385 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 02:54:49,386 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 02:54:49,386 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 02:54:49,386 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 02:54:49,386 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 02:54:49,387 INFO L87 Difference]: Start difference. First operand 55 states and 72 transitions. Second operand 3 states. [2018-01-21 02:54:49,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 02:54:49,405 INFO L93 Difference]: Finished difference Result 65 states and 83 transitions. [2018-01-21 02:54:49,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 02:54:49,406 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-01-21 02:54:49,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 02:54:49,407 INFO L225 Difference]: With dead ends: 65 [2018-01-21 02:54:49,408 INFO L226 Difference]: Without dead ends: 56 [2018-01-21 02:54:49,408 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 02:54:49,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-01-21 02:54:49,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-01-21 02:54:49,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 02:54:49,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2018-01-21 02:54:49,415 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 13 [2018-01-21 02:54:49,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 02:54:49,415 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2018-01-21 02:54:49,416 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 02:54:49,416 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2018-01-21 02:54:49,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-01-21 02:54:49,416 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:49,417 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:49,417 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 02:54:49,417 INFO L82 PathProgramCache]: Analyzing trace with hash 1605916762, now seen corresponding path program 1 times [2018-01-21 02:54:49,417 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:49,418 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,418 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:49,418 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,418 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:49,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 02:54:49,428 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 02:54:49,453 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 02:54:49,453 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 02:54:49,453 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 02:54:49,453 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 02:54:49,454 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 02:54:49,454 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 02:54:49,454 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 02:54:49,454 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand 3 states. [2018-01-21 02:54:49,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 02:54:49,514 INFO L93 Difference]: Finished difference Result 65 states and 82 transitions. [2018-01-21 02:54:49,515 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 02:54:49,515 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-01-21 02:54:49,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 02:54:49,516 INFO L225 Difference]: With dead ends: 65 [2018-01-21 02:54:49,516 INFO L226 Difference]: Without dead ends: 62 [2018-01-21 02:54:49,517 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 02:54:49,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-01-21 02:54:49,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2018-01-21 02:54:49,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 02:54:49,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 75 transitions. [2018-01-21 02:54:49,525 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 75 transitions. Word has length 13 [2018-01-21 02:54:49,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 02:54:49,525 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 75 transitions. [2018-01-21 02:54:49,525 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 02:54:49,526 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 75 transitions. [2018-01-21 02:54:49,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 02:54:49,526 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:49,527 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:49,527 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 02:54:49,527 INFO L82 PathProgramCache]: Analyzing trace with hash 1614897922, now seen corresponding path program 1 times [2018-01-21 02:54:49,527 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:49,528 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,528 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:49,528 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,529 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:49,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 02:54:49,542 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 02:54:49,595 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 02:54:49,595 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 02:54:49,595 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 02:54:49,595 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 02:54:49,596 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 02:54:49,596 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 02:54:49,596 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 02:54:49,597 INFO L87 Difference]: Start difference. First operand 58 states and 75 transitions. Second operand 4 states. [2018-01-21 02:54:49,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 02:54:49,654 INFO L93 Difference]: Finished difference Result 114 states and 149 transitions. [2018-01-21 02:54:49,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 02:54:49,654 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2018-01-21 02:54:49,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 02:54:49,656 INFO L225 Difference]: With dead ends: 114 [2018-01-21 02:54:49,656 INFO L226 Difference]: Without dead ends: 100 [2018-01-21 02:54:49,657 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 02:54:49,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-01-21 02:54:49,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 95. [2018-01-21 02:54:49,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-01-21 02:54:49,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 129 transitions. [2018-01-21 02:54:49,672 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 129 transitions. Word has length 19 [2018-01-21 02:54:49,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 02:54:49,673 INFO L432 AbstractCegarLoop]: Abstraction has 95 states and 129 transitions. [2018-01-21 02:54:49,673 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 02:54:49,673 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 129 transitions. [2018-01-21 02:54:49,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 02:54:49,676 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:49,676 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:49,676 INFO L371 AbstractCegarLoop]: === Iteration 5 === [mainErr0EnsuresViolation]=== [2018-01-21 02:54:49,676 INFO L82 PathProgramCache]: Analyzing trace with hash -302614467, now seen corresponding path program 1 times [2018-01-21 02:54:49,677 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:49,677 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,678 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:49,678 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:49,678 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:49,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 02:54:49,693 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 02:54:49,875 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 02:54:49,875 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 02:54:49,875 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-01-21 02:54:49,876 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 02:54:49,876 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 02:54:49,876 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 02:54:49,876 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2018-01-21 02:54:49,877 INFO L87 Difference]: Start difference. First operand 95 states and 129 transitions. Second operand 7 states. [2018-01-21 02:54:50,246 WARN L143 SmtUtils]: Spent 131ms on a formula simplification that was a NOOP. DAG size: 9 [2018-01-21 02:54:50,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 02:54:50,754 INFO L93 Difference]: Finished difference Result 227 states and 312 transitions. [2018-01-21 02:54:50,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 02:54:50,754 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 37 [2018-01-21 02:54:50,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 02:54:50,756 INFO L225 Difference]: With dead ends: 227 [2018-01-21 02:54:50,756 INFO L226 Difference]: Without dead ends: 174 [2018-01-21 02:54:50,757 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2018-01-21 02:54:50,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-01-21 02:54:50,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 150. [2018-01-21 02:54:50,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-01-21 02:54:50,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 207 transitions. [2018-01-21 02:54:50,783 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 207 transitions. Word has length 37 [2018-01-21 02:54:50,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 02:54:50,783 INFO L432 AbstractCegarLoop]: Abstraction has 150 states and 207 transitions. [2018-01-21 02:54:50,783 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 02:54:50,783 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 207 transitions. [2018-01-21 02:54:50,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 02:54:50,785 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 02:54:50,785 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 02:54:50,785 INFO L371 AbstractCegarLoop]: === Iteration 6 === [mainErr0EnsuresViolation]=== [2018-01-21 02:54:50,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1718063660, now seen corresponding path program 1 times [2018-01-21 02:54:50,786 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 02:54:50,787 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:50,787 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 02:54:50,787 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 02:54:50,787 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 02:54:50,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 02:54:50,812 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 02:54:51,019 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 02:54:51,019 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 02:54:51,019 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 02:54:51,020 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 48 with the following transitions: [2018-01-21 02:54:51,022 INFO L201 CegarAbsIntRunner]: [2], [4], [7], [9], [13], [15], [21], [29], [33], [35], [36], [37], [38], [39], [43], [45], [87], [90], [91], [101], [107], [117], [120], [121], [122], [123], [124], [128], [130], [131], [139], [140], [141], [142], [143] [2018-01-21 02:54:51,072 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 02:54:51,073 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