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/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:52:13,435 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:52:13,437 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:52:13,449 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:52:13,450 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:52:13,451 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:52:13,452 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:52:13,454 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:52:13,455 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:52:13,456 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:52:13,456 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:52:13,456 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:52:13,457 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:52:13,458 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:52:13,459 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:52:13,462 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:52:13,464 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:52:13,466 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:52:13,467 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:52:13,468 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:52:13,471 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-20 23:52:13,475 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:52:13,476 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:52:13,476 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ.epf [2018-01-20 23:52:13,486 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:52:13,487 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:52:13,487 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:52:13,488 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:52:13,488 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:52:13,488 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:52:13,488 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:52:13,489 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:52:13,489 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:52:13,489 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:52:13,490 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:52:13,490 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:52:13,490 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:52:13,490 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:52:13,490 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:52:13,491 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:52:13,491 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:52:13,491 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:52:13,491 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:52:13,491 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:52:13,492 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:52:13,492 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:52:13,492 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:52:13,492 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:52:13,492 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:52:13,493 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:52:13,493 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:52:13,493 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:52:13,493 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:52:13,493 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:52:13,494 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:52:13,494 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:52:13,494 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:52:13,494 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:52:13,494 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:52:13,495 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:52:13,495 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:52:13,496 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:52:13,532 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:52:13,546 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:52:13,550 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:52:13,552 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:52:13,552 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:52:13,553 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-20 23:52:13,705 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:52:13,710 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:52:13,710 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:52:13,711 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:52:13,716 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:52:13,717 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:52:13" (1/1) ... [2018-01-20 23:52:13,720 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23155f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13, skipping insertion in model container [2018-01-20 23:52:13,720 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:52:13" (1/1) ... [2018-01-20 23:52:13,734 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:52:13,748 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:52:13,860 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:52:13,876 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:52:13,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13 WrapperNode [2018-01-20 23:52:13,882 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:52:13,883 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:52:13,883 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:52:13,883 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:52:13,894 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13" (1/1) ... [2018-01-20 23:52:13,894 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13" (1/1) ... [2018-01-20 23:52:13,901 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13" (1/1) ... [2018-01-20 23:52:13,902 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13" (1/1) ... [2018-01-20 23:52:13,905 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13" (1/1) ... [2018-01-20 23:52:13,908 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13" (1/1) ... [2018-01-20 23:52:13,909 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13" (1/1) ... [2018-01-20 23:52:13,911 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:52:13,912 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:52:13,912 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:52:13,912 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:52:13,913 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:52:13,958 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:52:13,959 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:52:13,959 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-20 23:52:13,959 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:52:13,959 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-20 23:52:13,959 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-20 23:52:13,960 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:52:13,960 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:52:13,960 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:52:13,960 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-20 23:52:13,960 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:52:13,960 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:52:13,961 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:52:14,141 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:52:14,141 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:52:14 BoogieIcfgContainer [2018-01-20 23:52:14,142 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:52:14,142 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:52:14,142 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:52:14,144 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:52:14,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:52:13" (1/3) ... [2018-01-20 23:52:14,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@496351b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:52:14, skipping insertion in model container [2018-01-20 23:52:14,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:13" (2/3) ... [2018-01-20 23:52:14,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@496351b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:52:14, skipping insertion in model container [2018-01-20 23:52:14,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:52:14" (3/3) ... [2018-01-20 23:52:14,147 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-20 23:52:14,155 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:52:14,161 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-20 23:52:14,206 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:52:14,206 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:52:14,206 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:52:14,206 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:52:14,206 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:52:14,206 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:52:14,206 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:52:14,206 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:52:14,207 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:52:14,226 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:52:14,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:52:14,233 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:14,234 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:52:14,234 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:52:14,239 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-20 23:52:14,242 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:14,294 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,294 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:14,295 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,295 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:14,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:52:14,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:52:14,350 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:52:14,356 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:52:14,391 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:52:14,391 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:52:14,391 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:52:14,391 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:52:14,391 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:52:14,391 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:52:14,391 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:52:14,391 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-20 23:52:14,391 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:52:14,393 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:52:14,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-20 23:52:14,394 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:14,394 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:14,394 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-20 23:52:14,395 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-20 23:52:14,395 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:14,396 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,396 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:14,396 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,396 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:14,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:14,424 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:14,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:14,454 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:14,455 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:52:14,455 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:14,456 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:52:14,467 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:52:14,467 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:14,469 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:52:14,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:14,498 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:52:14,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:52:14,500 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-20 23:52:14,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:14,508 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:52:14,508 INFO L226 Difference]: Without dead ends: 0 [2018-01-20 23:52:14,512 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:14,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-20 23:52:14,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-20 23:52:14,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-20 23:52:14,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-20 23:52:14,597 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-20 23:52:14,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:14,597 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-20 23:52:14,597 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:52:14,598 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-20 23:52:14,598 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-20 23:52:14,601 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:52:14,601 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:52:14,601 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:52:14,601 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:52:14,601 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:52:14,601 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:52:14,601 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:52:14,601 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:52:14,601 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:52:14,603 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:52:14,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-20 23:52:14,604 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:14,604 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:14,604 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:14,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-20 23:52:14,604 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:14,605 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,605 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:14,605 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,605 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:14,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:14,612 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:14,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:14,623 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:14,623 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:52:14,623 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:14,624 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:52:14,624 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:52:14,624 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:14,624 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:52:14,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:14,628 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:52:14,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:52:14,629 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-20 23:52:14,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:14,630 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:52:14,631 INFO L226 Difference]: Without dead ends: 37 [2018-01-20 23:52:14,631 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:14,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-20 23:52:14,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-20 23:52:14,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-20 23:52:14,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-20 23:52:14,641 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-20 23:52:14,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:14,642 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-20 23:52:14,642 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:52:14,642 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-20 23:52:14,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:52:14,642 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:14,643 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:14,643 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:14,643 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-20 23:52:14,643 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:14,644 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,644 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:14,644 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,644 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:14,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:14,655 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:14,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:14,690 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:14,690 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:52:14,690 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:14,691 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:52:14,692 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:52:14,692 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:52:14,692 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-20 23:52:14,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:14,743 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-20 23:52:14,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:52:14,744 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-20 23:52:14,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:14,747 INFO L225 Difference]: With dead ends: 66 [2018-01-20 23:52:14,747 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:52:14,748 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:52:14,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:52:14,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-20 23:52:14,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-20 23:52:14,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-20 23:52:14,758 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-20 23:52:14,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:14,759 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-20 23:52:14,759 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:52:14,759 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-20 23:52:14,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-20 23:52:14,760 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:14,760 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] [2018-01-20 23:52:14,760 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:14,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-20 23:52:14,761 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:14,761 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,762 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:14,762 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,762 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:14,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:14,780 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:14,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:14,912 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:14,912 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-20 23:52:14,912 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:14,913 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-20 23:52:14,913 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-20 23:52:14,913 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-01-20 23:52:14,914 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-20 23:52:14,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:14,996 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-20 23:52:14,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:52:14,997 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-20 23:52:14,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:14,998 INFO L225 Difference]: With dead ends: 80 [2018-01-20 23:52:14,998 INFO L226 Difference]: Without dead ends: 46 [2018-01-20 23:52:14,999 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-01-20 23:52:14,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-20 23:52:15,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-20 23:52:15,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-20 23:52:15,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-20 23:52:15,005 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-20 23:52:15,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:15,006 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-20 23:52:15,006 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-20 23:52:15,006 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-20 23:52:15,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-20 23:52:15,007 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:15,008 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:15,008 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:15,008 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-20 23:52:15,008 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:15,009 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:15,009 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:15,009 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:15,010 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:15,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:15,027 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:15,109 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:15,109 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:15,109 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:15,111 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-20 23:52:15,112 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-20 23:52:15,161 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:52:15,161 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:52:16,631 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:52:16,632 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-20 23:52:16,645 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:52:16,645 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:16,646 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:16,658 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:16,658 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:16,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:16,689 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:16,750 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:16,751 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:16,907 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:16,942 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:16,942 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:16,952 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:16,952 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:16,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:16,993 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:17,034 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:52:17,034 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:17,133 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:52:17,136 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:17,136 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 4, 4] total 15 [2018-01-20 23:52:17,136 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:17,137 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-20 23:52:17,137 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-20 23:52:17,137 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2018-01-20 23:52:17,138 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-20 23:52:17,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:17,550 INFO L93 Difference]: Finished difference Result 87 states and 94 transitions. [2018-01-20 23:52:17,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:52:17,553 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-20 23:52:17,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:17,554 INFO L225 Difference]: With dead ends: 87 [2018-01-20 23:52:17,555 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:52:17,555 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-01-20 23:52:17,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:52:17,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2018-01-20 23:52:17,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-20 23:52:17,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-01-20 23:52:17,562 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 36 [2018-01-20 23:52:17,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:17,563 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-01-20 23:52:17,563 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-20 23:52:17,563 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-01-20 23:52:17,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-20 23:52:17,564 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:17,564 INFO L322 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1] [2018-01-20 23:52:17,565 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:17,565 INFO L82 PathProgramCache]: Analyzing trace with hash -524554428, now seen corresponding path program 2 times [2018-01-20 23:52:17,565 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:17,566 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:17,566 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:17,567 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:17,567 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:17,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:17,582 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:17,807 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:17,808 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:17,808 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:17,808 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:17,808 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:17,809 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:17,809 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:17,821 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:17,821 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:17,836 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:17,841 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:17,848 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:17,851 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:17,902 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:17,902 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:18,004 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:18,024 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:18,025 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:18,027 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:18,028 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:18,038 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:18,051 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:18,063 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:18,068 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:18,104 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-20 23:52:18,104 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:18,155 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-20 23:52:18,156 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:18,156 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 4, 4] total 18 [2018-01-20 23:52:18,157 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:18,157 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:52:18,157 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:52:18,157 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2018-01-20 23:52:18,157 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 10 states. [2018-01-20 23:52:18,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:18,293 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2018-01-20 23:52:18,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-20 23:52:18,294 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 41 [2018-01-20 23:52:18,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:18,294 INFO L225 Difference]: With dead ends: 97 [2018-01-20 23:52:18,295 INFO L226 Difference]: Without dead ends: 56 [2018-01-20 23:52:18,295 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:52:18,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-01-20 23:52:18,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2018-01-20 23:52:18,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-20 23:52:18,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-01-20 23:52:18,300 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 41 [2018-01-20 23:52:18,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:18,300 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-01-20 23:52:18,300 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:52:18,300 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-01-20 23:52:18,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-20 23:52:18,301 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:18,301 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 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] [2018-01-20 23:52:18,301 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:18,301 INFO L82 PathProgramCache]: Analyzing trace with hash -438141712, now seen corresponding path program 3 times [2018-01-20 23:52:18,302 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:18,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:18,303 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:18,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:18,303 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:18,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:18,319 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:18,447 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:18,447 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:18,447 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:18,447 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:18,448 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:18,448 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:18,448 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:18,453 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:18,453 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:18,460 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:18,464 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:18,464 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:18,467 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:18,514 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-20 23:52:18,514 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:18,554 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-20 23:52:18,575 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:18,575 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:18,580 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:18,580 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:18,594 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:18,605 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:18,612 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:18,616 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:18,622 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-20 23:52:18,622 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:18,650 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-20 23:52:18,651 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:18,651 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 4, 4] total 11 [2018-01-20 23:52:18,651 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:18,652 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-20 23:52:18,652 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-20 23:52:18,652 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:52:18,652 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 9 states. [2018-01-20 23:52:18,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:18,751 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2018-01-20 23:52:18,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-20 23:52:18,752 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2018-01-20 23:52:18,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:18,753 INFO L225 Difference]: With dead ends: 131 [2018-01-20 23:52:18,754 INFO L226 Difference]: Without dead ends: 85 [2018-01-20 23:52:18,754 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-01-20 23:52:18,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-01-20 23:52:18,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2018-01-20 23:52:18,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-01-20 23:52:18,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 72 transitions. [2018-01-20 23:52:18,762 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 72 transitions. Word has length 46 [2018-01-20 23:52:18,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:18,762 INFO L432 AbstractCegarLoop]: Abstraction has 67 states and 72 transitions. [2018-01-20 23:52:18,762 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-20 23:52:18,762 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 72 transitions. [2018-01-20 23:52:18,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-01-20 23:52:18,765 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:18,765 INFO L322 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 3, 2, 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] [2018-01-20 23:52:18,765 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:18,765 INFO L82 PathProgramCache]: Analyzing trace with hash 515188947, now seen corresponding path program 4 times [2018-01-20 23:52:18,766 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:18,766 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:18,766 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:18,766 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:18,766 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:18,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:18,788 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:19,082 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-20 23:52:19,083 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:19,083 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:19,083 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:19,083 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:19,083 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:19,083 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:19,091 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:52:19,091 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:52:19,119 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:19,122 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:19,283 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-20 23:52:19,283 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:19,472 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-20 23:52:19,505 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:19,507 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:19,517 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:52:19,517 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:52:19,579 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:19,585 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:19,598 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-20 23:52:19,599 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:19,658 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-20 23:52:19,660 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:19,660 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-20 23:52:19,660 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:19,661 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-20 23:52:19,661 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-20 23:52:19,661 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2018-01-20 23:52:19,661 INFO L87 Difference]: Start difference. First operand 67 states and 72 transitions. Second operand 14 states. [2018-01-20 23:52:19,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:19,813 INFO L93 Difference]: Finished difference Result 134 states and 145 transitions. [2018-01-20 23:52:19,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-20 23:52:19,814 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 82 [2018-01-20 23:52:19,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:19,815 INFO L225 Difference]: With dead ends: 134 [2018-01-20 23:52:19,815 INFO L226 Difference]: Without dead ends: 75 [2018-01-20 23:52:19,816 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 314 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=201, Invalid=449, Unknown=0, NotChecked=0, Total=650 [2018-01-20 23:52:19,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-20 23:52:19,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2018-01-20 23:52:19,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-01-20 23:52:19,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-01-20 23:52:19,822 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 82 [2018-01-20 23:52:19,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:19,822 INFO L432 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-01-20 23:52:19,822 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-20 23:52:19,823 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-01-20 23:52:19,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-01-20 23:52:19,824 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:19,824 INFO L322 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 3, 2, 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] [2018-01-20 23:52:19,825 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:19,825 INFO L82 PathProgramCache]: Analyzing trace with hash -611097235, now seen corresponding path program 5 times [2018-01-20 23:52:19,825 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:19,826 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:19,826 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:19,826 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:19,826 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:19,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:19,845 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:20,032 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-20 23:52:20,032 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:20,032 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:20,032 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:20,032 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:20,032 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:20,032 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:20,040 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:52:20,041 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:20,049 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,052 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,054 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,056 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,059 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,066 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,067 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:20,071 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:20,208 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-20 23:52:20,208 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:20,361 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-20 23:52:20,380 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:20,380 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:20,383 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:52:20,383 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:20,392 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,395 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,401 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,409 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,423 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,439 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:20,447 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:20,451 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:20,464 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-20 23:52:20,464 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:20,546 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-20 23:52:20,548 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:20,549 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-20 23:52:20,549 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:20,549 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-20 23:52:20,549 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-20 23:52:20,550 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-01-20 23:52:20,550 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 16 states. [2018-01-20 23:52:20,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:20,754 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2018-01-20 23:52:20,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-20 23:52:20,754 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 92 [2018-01-20 23:52:20,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:20,755 INFO L225 Difference]: With dead ends: 144 [2018-01-20 23:52:20,755 INFO L226 Difference]: Without dead ends: 80 [2018-01-20 23:52:20,756 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 352 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=268, Invalid=602, Unknown=0, NotChecked=0, Total=870 [2018-01-20 23:52:20,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-20 23:52:20,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 77. [2018-01-20 23:52:20,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-20 23:52:20,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-01-20 23:52:20,765 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 92 [2018-01-20 23:52:20,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:20,765 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-01-20 23:52:20,765 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-20 23:52:20,766 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-01-20 23:52:20,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-01-20 23:52:20,768 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:20,768 INFO L322 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 3, 2, 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] [2018-01-20 23:52:20,768 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:20,768 INFO L82 PathProgramCache]: Analyzing trace with hash -556985837, now seen corresponding path program 6 times [2018-01-20 23:52:20,768 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:20,769 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:20,769 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:20,769 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:20,769 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:20,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:20,788 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:21,028 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 5 proven. 296 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-01-20 23:52:21,028 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:21,029 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:21,029 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:21,029 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:21,029 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:21,029 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:21,034 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:52:21,035 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:52:21,043 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,045 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,048 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,050 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,054 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,056 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:21,058 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:21,080 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-20 23:52:21,081 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:21,119 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-20 23:52:21,139 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:21,139 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:21,142 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:52:21,142 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:52:21,154 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,159 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,170 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,182 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,200 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:21,209 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:21,213 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:21,225 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-20 23:52:21,226 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:21,261 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-20 23:52:21,263 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:21,263 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5, 5, 5] total 16 [2018-01-20 23:52:21,263 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:21,264 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-20 23:52:21,264 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-20 23:52:21,264 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2018-01-20 23:52:21,264 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-01-20 23:52:21,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:21,378 INFO L93 Difference]: Finished difference Result 183 states and 202 transitions. [2018-01-20 23:52:21,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-20 23:52:21,379 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 102 [2018-01-20 23:52:21,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:21,380 INFO L225 Difference]: With dead ends: 183 [2018-01-20 23:52:21,380 INFO L226 Difference]: Without dead ends: 114 [2018-01-20 23:52:21,380 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:52:21,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-01-20 23:52:21,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 91. [2018-01-20 23:52:21,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-01-20 23:52:21,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2018-01-20 23:52:21,387 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 102 [2018-01-20 23:52:21,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:21,387 INFO L432 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2018-01-20 23:52:21,387 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-20 23:52:21,388 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2018-01-20 23:52:21,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-01-20 23:52:21,389 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:21,390 INFO L322 BasicCegarLoop]: trace histogram [24, 21, 21, 21, 21, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:21,390 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:21,390 INFO L82 PathProgramCache]: Analyzing trace with hash 294495146, now seen corresponding path program 7 times [2018-01-20 23:52:21,390 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:21,391 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:21,391 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:21,391 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:21,391 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:21,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:21,425 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:21,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-20 23:52:21,673 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:21,673 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:21,673 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:21,673 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:21,673 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:21,673 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:21,678 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:21,678 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:21,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:21,708 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:21,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-20 23:52:21,847 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:22,088 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-20 23:52:22,108 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:22,108 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:22,111 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:22,111 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:22,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:22,175 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:22,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-20 23:52:22,195 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:22,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-20 23:52:22,286 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:22,286 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-20 23:52:22,286 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:22,287 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-20 23:52:22,287 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-20 23:52:22,287 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=582, Unknown=0, NotChecked=0, Total=812 [2018-01-20 23:52:22,288 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand 20 states. [2018-01-20 23:52:22,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:22,504 INFO L93 Difference]: Finished difference Result 182 states and 198 transitions. [2018-01-20 23:52:22,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-20 23:52:22,505 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 158 [2018-01-20 23:52:22,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:22,505 INFO L225 Difference]: With dead ends: 182 [2018-01-20 23:52:22,505 INFO L226 Difference]: Without dead ends: 99 [2018-01-20 23:52:22,506 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 650 GetRequests, 612 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=432, Invalid=974, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:52:22,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-01-20 23:52:22,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2018-01-20 23:52:22,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-20 23:52:22,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2018-01-20 23:52:22,514 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 158 [2018-01-20 23:52:22,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:22,514 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2018-01-20 23:52:22,515 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-20 23:52:22,515 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2018-01-20 23:52:22,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-01-20 23:52:22,517 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:22,517 INFO L322 BasicCegarLoop]: trace histogram [27, 24, 24, 24, 24, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:22,517 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:22,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1051815268, now seen corresponding path program 8 times [2018-01-20 23:52:22,518 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:22,518 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:22,518 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:22,518 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:22,518 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:22,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:22,542 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:22,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-20 23:52:22,821 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:22,821 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:22,821 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:22,821 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:22,821 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:22,821 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:22,826 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:22,826 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:22,837 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:22,856 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:22,859 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:22,863 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:22,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-20 23:52:22,995 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:23,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-20 23:52:23,278 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:23,278 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:23,282 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:23,282 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:23,300 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:23,334 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:23,359 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:23,365 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:23,387 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-20 23:52:23,387 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:23,488 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-20 23:52:23,490 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:23,490 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-20 23:52:23,490 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:23,490 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-20 23:52:23,491 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-20 23:52:23,491 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=712, Unknown=0, NotChecked=0, Total=992 [2018-01-20 23:52:23,491 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 22 states. [2018-01-20 23:52:23,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:23,723 INFO L93 Difference]: Finished difference Result 192 states and 208 transitions. [2018-01-20 23:52:23,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-20 23:52:23,724 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 173 [2018-01-20 23:52:23,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:23,725 INFO L225 Difference]: With dead ends: 192 [2018-01-20 23:52:23,725 INFO L226 Difference]: Without dead ends: 104 [2018-01-20 23:52:23,726 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 670 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=529, Invalid=1193, Unknown=0, NotChecked=0, Total=1722 [2018-01-20 23:52:23,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-01-20 23:52:23,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 101. [2018-01-20 23:52:23,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-20 23:52:23,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 108 transitions. [2018-01-20 23:52:23,734 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 108 transitions. Word has length 173 [2018-01-20 23:52:23,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:23,734 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 108 transitions. [2018-01-20 23:52:23,734 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-20 23:52:23,734 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 108 transitions. [2018-01-20 23:52:23,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-01-20 23:52:23,736 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:23,737 INFO L322 BasicCegarLoop]: trace histogram [30, 27, 27, 27, 27, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:23,737 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:23,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1142155370, now seen corresponding path program 9 times [2018-01-20 23:52:23,737 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:23,738 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:23,738 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:23,738 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:23,738 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:23,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:23,763 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:24,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 8 proven. 1090 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2018-01-20 23:52:24,094 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:24,094 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:24,094 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:24,094 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:24,094 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:24,094 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:24,099 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:24,099 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:24,113 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:24,115 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:24,119 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:24,122 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:24,123 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:24,126 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:24,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-20 23:52:24,172 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:24,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-20 23:52:24,264 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:24,264 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:24,267 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:24,267 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:24,283 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:24,292 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:24,306 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:24,327 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:24,339 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:24,344 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:24,372 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-20 23:52:24,372 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:24,433 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-20 23:52:24,434 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:24,434 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6, 6, 6] total 21 [2018-01-20 23:52:24,434 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:24,435 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-20 23:52:24,435 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-20 23:52:24,435 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-01-20 23:52:24,436 INFO L87 Difference]: Start difference. First operand 101 states and 108 transitions. Second operand 17 states. [2018-01-20 23:52:24,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:24,600 INFO L93 Difference]: Finished difference Result 236 states and 260 transitions. [2018-01-20 23:52:24,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-20 23:52:24,600 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 188 [2018-01-20 23:52:24,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:24,602 INFO L225 Difference]: With dead ends: 236 [2018-01-20 23:52:24,602 INFO L226 Difference]: Without dead ends: 143 [2018-01-20 23:52:24,603 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 744 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=124, Invalid=338, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:52:24,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-20 23:52:24,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 115. [2018-01-20 23:52:24,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-20 23:52:24,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-01-20 23:52:24,610 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 188 [2018-01-20 23:52:24,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:24,610 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-01-20 23:52:24,611 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-20 23:52:24,611 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-01-20 23:52:24,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-01-20 23:52:24,613 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:24,613 INFO L322 BasicCegarLoop]: trace histogram [44, 40, 40, 40, 40, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:24,613 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:24,613 INFO L82 PathProgramCache]: Analyzing trace with hash 132824627, now seen corresponding path program 10 times [2018-01-20 23:52:24,613 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:24,614 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:24,614 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:24,614 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:24,614 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:24,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:24,637 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:25,408 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-20 23:52:25,408 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:25,408 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:25,409 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:25,409 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:25,409 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:25,409 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:25,414 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:52:25,414 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:52:25,479 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:25,485 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:25,692 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-20 23:52:25,692 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:26,121 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-20 23:52:26,141 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:26,141 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:26,144 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:52:26,144 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:52:26,500 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:26,510 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:26,550 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-20 23:52:26,550 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:26,851 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-20 23:52:26,854 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:26,855 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-20 23:52:26,855 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:26,855 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-20 23:52:26,855 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-20 23:52:26,856 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:52:26,856 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 26 states. [2018-01-20 23:52:27,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:27,258 INFO L93 Difference]: Finished difference Result 230 states and 251 transitions. [2018-01-20 23:52:27,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-20 23:52:27,258 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 264 [2018-01-20 23:52:27,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:27,260 INFO L225 Difference]: With dead ends: 230 [2018-01-20 23:52:27,260 INFO L226 Difference]: Without dead ends: 123 [2018-01-20 23:52:27,261 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1080 GetRequests, 1030 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=753, Invalid=1697, Unknown=0, NotChecked=0, Total=2450 [2018-01-20 23:52:27,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-20 23:52:27,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2018-01-20 23:52:27,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-01-20 23:52:27,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 129 transitions. [2018-01-20 23:52:27,267 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 129 transitions. Word has length 264 [2018-01-20 23:52:27,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:27,268 INFO L432 AbstractCegarLoop]: Abstraction has 120 states and 129 transitions. [2018-01-20 23:52:27,268 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-20 23:52:27,268 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 129 transitions. [2018-01-20 23:52:27,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-01-20 23:52:27,269 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:27,269 INFO L322 BasicCegarLoop]: trace histogram [48, 44, 44, 44, 44, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:27,269 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:27,269 INFO L82 PathProgramCache]: Analyzing trace with hash -171303065, now seen corresponding path program 11 times [2018-01-20 23:52:27,269 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:27,270 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:27,270 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:27,270 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:27,271 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:27,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:27,292 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:27,698 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-20 23:52:27,699 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:27,699 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:27,699 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:27,699 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:27,699 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:27,699 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:27,704 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:52:27,704 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:27,719 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,721 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,723 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,726 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,729 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,732 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,736 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,740 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,745 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,750 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,756 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,764 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,774 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,775 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:27,780 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:28,025 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-20 23:52:28,026 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:28,560 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-20 23:52:28,581 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:28,581 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:28,584 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:52:28,584 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:28,605 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:28,608 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:28,616 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:28,628 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:28,648 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:28,678 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:28,720 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:28,775 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:28,859 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:28,985 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:29,157 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:29,402 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:29,707 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:29,758 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:29,767 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:29,829 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-20 23:52:29,830 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:30,068 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-20 23:52:30,070 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:30,071 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-20 23:52:30,071 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:30,071 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-20 23:52:30,071 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-20 23:52:30,072 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-01-20 23:52:30,072 INFO L87 Difference]: Start difference. First operand 120 states and 129 transitions. Second operand 28 states. [2018-01-20 23:52:30,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:30,565 INFO L93 Difference]: Finished difference Result 240 states and 261 transitions. [2018-01-20 23:52:30,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-20 23:52:30,566 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 284 [2018-01-20 23:52:30,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:30,567 INFO L225 Difference]: With dead ends: 240 [2018-01-20 23:52:30,567 INFO L226 Difference]: Without dead ends: 128 [2018-01-20 23:52:30,568 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1162 GetRequests, 1108 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=880, Invalid=1982, Unknown=0, NotChecked=0, Total=2862 [2018-01-20 23:52:30,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-20 23:52:30,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 125. [2018-01-20 23:52:30,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-01-20 23:52:30,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2018-01-20 23:52:30,574 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 284 [2018-01-20 23:52:30,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:30,574 INFO L432 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2018-01-20 23:52:30,574 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-20 23:52:30,574 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2018-01-20 23:52:30,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-01-20 23:52:30,575 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:30,575 INFO L322 BasicCegarLoop]: trace histogram [52, 48, 48, 48, 48, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:30,575 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:30,576 INFO L82 PathProgramCache]: Analyzing trace with hash -2029948749, now seen corresponding path program 12 times [2018-01-20 23:52:30,576 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:30,576 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:30,576 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:30,576 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:30,577 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:30,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:30,598 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:31,103 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 11 proven. 2673 refuted. 0 times theorem prover too weak. 3414 trivial. 0 not checked. [2018-01-20 23:52:31,103 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:31,103 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:31,103 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:31,104 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:31,104 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:31,104 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:31,110 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:52:31,110 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:52:31,132 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,136 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,142 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,145 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,151 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,158 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,166 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,171 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,176 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,178 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:31,181 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:31,254 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-20 23:52:31,255 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:31,353 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-20 23:52:31,386 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:31,386 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:31,395 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:52:31,396 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:52:31,429 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,438 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,456 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,474 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,494 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,531 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,569 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,651 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,920 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,944 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:31,950 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:31,997 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-20 23:52:31,997 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:32,069 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-20 23:52:32,071 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:32,071 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7, 7, 7, 7] total 26 [2018-01-20 23:52:32,071 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:32,072 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-20 23:52:32,072 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-20 23:52:32,072 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2018-01-20 23:52:32,072 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand 21 states. [2018-01-20 23:52:32,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:32,302 INFO L93 Difference]: Finished difference Result 289 states and 318 transitions. [2018-01-20 23:52:32,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-20 23:52:32,302 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 304 [2018-01-20 23:52:32,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:32,303 INFO L225 Difference]: With dead ends: 289 [2018-01-20 23:52:32,303 INFO L226 Difference]: Without dead ends: 172 [2018-01-20 23:52:32,304 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1231 GetRequests, 1206 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2018-01-20 23:52:32,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-20 23:52:32,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 139. [2018-01-20 23:52:32,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-01-20 23:52:32,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-01-20 23:52:32,310 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 304 [2018-01-20 23:52:32,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:32,311 INFO L432 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-01-20 23:52:32,311 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-20 23:52:32,311 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-01-20 23:52:32,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2018-01-20 23:52:32,312 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:32,313 INFO L322 BasicCegarLoop]: trace histogram [70, 65, 65, 65, 65, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:32,313 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:32,313 INFO L82 PathProgramCache]: Analyzing trace with hash 1350287972, now seen corresponding path program 13 times [2018-01-20 23:52:32,313 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:32,314 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:32,314 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:32,314 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:32,314 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:32,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:32,341 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:33,117 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-20 23:52:33,117 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:33,117 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:33,117 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:33,118 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:33,118 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:33,118 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:33,124 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:33,124 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:33,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:33,211 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:33,769 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-20 23:52:33,770 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:34,006 WARN L143 SmtUtils]: Spent 107ms on a formula simplification that was a NOOP. DAG size: 49 [2018-01-20 23:52:34,777 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-20 23:52:34,797 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:34,811 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:34,814 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:34,814 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:34,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:34,968 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:35,039 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-20 23:52:35,040 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:35,226 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-20 23:52:35,227 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:35,228 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-20 23:52:35,228 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:35,228 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-20 23:52:35,229 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-20 23:52:35,229 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=1557, Unknown=0, NotChecked=0, Total=2162 [2018-01-20 23:52:35,230 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 32 states. [2018-01-20 23:52:35,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:35,635 INFO L93 Difference]: Finished difference Result 278 states and 304 transitions. [2018-01-20 23:52:35,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-20 23:52:35,636 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 400 [2018-01-20 23:52:35,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:35,637 INFO L225 Difference]: With dead ends: 278 [2018-01-20 23:52:35,637 INFO L226 Difference]: Without dead ends: 147 [2018-01-20 23:52:35,638 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1630 GetRequests, 1568 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1164, Invalid=2618, Unknown=0, NotChecked=0, Total=3782 [2018-01-20 23:52:35,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-01-20 23:52:35,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2018-01-20 23:52:35,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-01-20 23:52:35,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 155 transitions. [2018-01-20 23:52:35,644 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 155 transitions. Word has length 400 [2018-01-20 23:52:35,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:35,644 INFO L432 AbstractCegarLoop]: Abstraction has 144 states and 155 transitions. [2018-01-20 23:52:35,644 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-20 23:52:35,644 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 155 transitions. [2018-01-20 23:52:35,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-20 23:52:35,646 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:35,646 INFO L322 BasicCegarLoop]: trace histogram [75, 70, 70, 70, 70, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:35,646 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:35,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1570210812, now seen corresponding path program 14 times [2018-01-20 23:52:35,647 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:35,647 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:35,647 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:35,647 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:35,648 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:35,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:35,671 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:36,402 WARN L146 SmtUtils]: Spent 148ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-20 23:52:36,645 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-20 23:52:36,645 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:36,645 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:36,645 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:36,645 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:36,645 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:36,645 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:36,650 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:36,650 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:36,669 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:36,707 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:36,714 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:36,718 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:37,019 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-20 23:52:37,019 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:38,210 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-20 23:52:38,231 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:38,231 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:38,235 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:38,235 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:38,266 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:38,339 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:38,399 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:38,409 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:38,489 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-20 23:52:38,489 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:38,699 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-20 23:52:38,700 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:38,700 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-20 23:52:38,701 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:38,701 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-20 23:52:38,701 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-20 23:52:38,702 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=685, Invalid=1765, Unknown=0, NotChecked=0, Total=2450 [2018-01-20 23:52:38,702 INFO L87 Difference]: Start difference. First operand 144 states and 155 transitions. Second operand 34 states. [2018-01-20 23:52:39,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:39,087 INFO L93 Difference]: Finished difference Result 288 states and 314 transitions. [2018-01-20 23:52:39,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-20 23:52:39,087 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 425 [2018-01-20 23:52:39,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:39,088 INFO L225 Difference]: With dead ends: 288 [2018-01-20 23:52:39,088 INFO L226 Difference]: Without dead ends: 152 [2018-01-20 23:52:39,090 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1732 GetRequests, 1666 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1321, Invalid=2969, Unknown=0, NotChecked=0, Total=4290 [2018-01-20 23:52:39,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-01-20 23:52:39,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 149. [2018-01-20 23:52:39,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-01-20 23:52:39,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 160 transitions. [2018-01-20 23:52:39,095 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 160 transitions. Word has length 425 [2018-01-20 23:52:39,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:39,095 INFO L432 AbstractCegarLoop]: Abstraction has 149 states and 160 transitions. [2018-01-20 23:52:39,095 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-20 23:52:39,095 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 160 transitions. [2018-01-20 23:52:39,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2018-01-20 23:52:39,097 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:39,097 INFO L322 BasicCegarLoop]: trace histogram [80, 75, 75, 75, 75, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:39,098 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:39,098 INFO L82 PathProgramCache]: Analyzing trace with hash -877517212, now seen corresponding path program 15 times [2018-01-20 23:52:39,098 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:39,098 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:39,099 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:39,099 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:39,099 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:39,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:39,123 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:39,533 WARN L146 SmtUtils]: Spent 129ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-20 23:52:39,941 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 14 proven. 5315 refuted. 0 times theorem prover too weak. 9416 trivial. 0 not checked. [2018-01-20 23:52:39,941 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:39,985 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:39,986 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:39,986 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:39,986 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:39,986 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:39,991 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:39,991 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:40,011 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,014 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,017 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,021 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,025 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,029 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,033 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,038 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,044 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,050 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,057 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,063 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,071 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,079 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,089 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,102 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,112 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:40,113 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:40,118 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:40,515 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-20 23:52:40,516 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:41,480 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-20 23:52:41,513 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:41,514 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:41,517 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:41,517 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:41,567 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:41,579 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:41,600 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:41,632 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:41,693 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:41,808 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:41,996 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:42,279 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:42,733 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:43,627 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:44,258 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:45,200 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:57,241 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown