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/ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:53:09,198 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:53:09,200 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:53:09,212 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:53:09,212 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:53:09,213 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:53:09,214 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:53:09,216 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:53:09,218 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:53:09,219 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:53:09,219 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:53:09,219 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:53:09,220 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:53:09,221 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:53:09,222 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:53:09,225 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:53:09,227 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:53:09,229 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:53:09,230 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:53:09,231 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:53:09,233 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-20 23:53:09,238 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:53:09,238 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:53:09,239 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 23:53:09,249 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:53:09,249 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:53:09,250 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:53:09,250 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:53:09,250 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:53:09,250 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:53:09,251 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:53:09,251 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:53:09,251 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:53:09,252 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:53:09,252 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:53:09,252 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:53:09,252 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:53:09,252 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:53:09,253 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:53:09,253 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:53:09,253 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:53:09,253 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:53:09,253 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:53:09,254 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:53:09,254 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:53:09,254 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:53:09,254 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:53:09,254 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:53:09,255 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:53:09,255 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:53:09,255 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:53:09,255 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:53:09,255 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:53:09,256 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:53:09,256 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:53:09,256 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:53:09,256 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:53:09,256 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:53:09,257 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:53:09,257 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:53:09,258 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:53:09,258 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:53:09,292 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:53:09,304 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:53:09,308 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:53:09,310 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:53:09,310 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:53:09,311 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c [2018-01-20 23:53:09,439 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:53:09,443 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:53:09,444 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:53:09,444 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:53:09,448 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:53:09,449 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:53:09" (1/1) ... [2018-01-20 23:53:09,452 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@50d6c681 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09, skipping insertion in model container [2018-01-20 23:53:09,452 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:53:09" (1/1) ... [2018-01-20 23:53:09,464 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:53:09,477 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:53:09,586 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:53:09,602 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:53:09,608 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09 WrapperNode [2018-01-20 23:53:09,608 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:53:09,609 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:53:09,609 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:53:09,609 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:53:09,620 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09" (1/1) ... [2018-01-20 23:53:09,620 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09" (1/1) ... [2018-01-20 23:53:09,628 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09" (1/1) ... [2018-01-20 23:53:09,628 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09" (1/1) ... [2018-01-20 23:53:09,631 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09" (1/1) ... [2018-01-20 23:53:09,634 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09" (1/1) ... [2018-01-20 23:53:09,635 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09" (1/1) ... [2018-01-20 23:53:09,637 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:53:09,638 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:53:09,638 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:53:09,638 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:53:09,639 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09" (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 23:53:09,690 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:53:09,690 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:53:09,691 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-20 23:53:09,691 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:53:09,691 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-20 23:53:09,691 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-20 23:53:09,691 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:53:09,691 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:53:09,691 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:53:09,692 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-20 23:53:09,692 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:53:09,692 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:53:09,692 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:53:09,872 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:53:09,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:53:09 BoogieIcfgContainer [2018-01-20 23:53:09,873 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:53:09,874 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:53:09,874 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:53:09,876 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:53:09,876 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:53:09" (1/3) ... [2018-01-20 23:53:09,877 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a71e24c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:53:09, skipping insertion in model container [2018-01-20 23:53:09,877 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:53:09" (2/3) ... [2018-01-20 23:53:09,877 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a71e24c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:53:09, skipping insertion in model container [2018-01-20 23:53:09,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:53:09" (3/3) ... [2018-01-20 23:53:09,879 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c [2018-01-20 23:53:09,885 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:53:09,891 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-20 23:53:09,934 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:53:09,934 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:53:09,934 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:53:09,935 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:53:09,935 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:53:09,935 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:53:09,935 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:53:09,935 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:53:09,936 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:53:09,949 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:53:09,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:53:09,954 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:09,955 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:53:09,956 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:53:09,961 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-20 23:53:09,964 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:10,006 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,006 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:10,006 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,006 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:10,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:53:10,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:53:10,065 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:53:10,071 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:53:10,076 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:53:10,076 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:53:10,076 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:53:10,076 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:53:10,077 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:53:10,077 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:53:10,077 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:53:10,077 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-20 23:53:10,077 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:53:10,078 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:53:10,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-20 23:53:10,079 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:10,079 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:53:10,079 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-20 23:53:10,080 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-20 23:53:10,080 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:10,081 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,081 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:10,081 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,081 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:10,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:10,104 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:10,134 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 23:53:10,136 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:53:10,136 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:53:10,136 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:53:10,138 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:53:10,148 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:53:10,148 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:53:10,151 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:53:10,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:10,179 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:53:10,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:53:10,181 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-20 23:53:10,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:10,189 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:53:10,189 INFO L226 Difference]: Without dead ends: 0 [2018-01-20 23:53:10,192 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 23:53:10,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-20 23:53:10,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-20 23:53:10,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-20 23:53:10,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-20 23:53:10,274 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-20 23:53:10,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:10,275 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-20 23:53:10,275 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:53:10,275 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-20 23:53:10,275 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-20 23:53:10,277 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:53:10,277 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:53:10,277 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:53:10,277 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:53:10,277 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:53:10,278 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:53:10,278 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:53:10,278 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:53:10,278 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:53:10,279 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:53:10,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-20 23:53:10,281 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:10,281 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 23:53:10,281 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:10,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-20 23:53:10,282 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:10,283 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,283 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:10,283 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,283 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:10,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:10,290 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:10,300 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 23:53:10,301 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:53:10,301 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:53:10,301 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:53:10,301 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:53:10,301 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:53:10,301 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:53:10,301 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:53:10,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:10,306 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:53:10,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:53:10,306 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-20 23:53:10,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:10,308 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:53:10,308 INFO L226 Difference]: Without dead ends: 37 [2018-01-20 23:53:10,309 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 23:53:10,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-20 23:53:10,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-20 23:53:10,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-20 23:53:10,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-20 23:53:10,318 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-20 23:53:10,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:10,318 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-20 23:53:10,318 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:53:10,318 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-20 23:53:10,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:53:10,319 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:10,319 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 23:53:10,319 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:10,319 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-20 23:53:10,319 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:10,320 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,320 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:10,320 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,320 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:10,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:10,329 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:10,363 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 23:53:10,363 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:53:10,364 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:53:10,364 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:53:10,365 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:53:10,366 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:53:10,366 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:53:10,366 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-20 23:53:10,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:10,427 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-20 23:53:10,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:53:10,427 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-20 23:53:10,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:10,430 INFO L225 Difference]: With dead ends: 66 [2018-01-20 23:53:10,430 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:53:10,431 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 23:53:10,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:53:10,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-20 23:53:10,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-20 23:53:10,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-20 23:53:10,441 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-20 23:53:10,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:10,441 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-20 23:53:10,441 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:53:10,441 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-20 23:53:10,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-20 23:53:10,442 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:10,442 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 23:53:10,442 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:10,442 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-20 23:53:10,443 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:10,444 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,444 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:10,444 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:10,444 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:10,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:10,462 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:10,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:53:10,604 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:10,605 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:10,606 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-20 23:53:10,607 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [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 23:53:10,654 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:53:10,654 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:53:11,962 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:53:11,964 INFO L268 AbstractInterpreter]: Visited 30 different actions 82 times. Merged at 14 different actions 31 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 17 variables. [2018-01-20 23:53:11,973 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:53:11,973 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:11,973 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 23:53:11,983 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:11,983 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:53:12,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:12,013 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:12,080 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 23:53:12,080 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:12,258 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 23:53:12,292 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-20 23:53:12,292 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [8] total 12 [2018-01-20 23:53:12,292 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:53:12,293 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-20 23:53:12,293 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-20 23:53:12,294 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2018-01-20 23:53:12,294 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-20 23:53:12,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:12,444 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-20 23:53:12,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:53:12,444 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-20 23:53:12,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:12,446 INFO L225 Difference]: With dead ends: 80 [2018-01-20 23:53:12,446 INFO L226 Difference]: Without dead ends: 46 [2018-01-20 23:53:12,446 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2018-01-20 23:53:12,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-20 23:53:12,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-20 23:53:12,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-20 23:53:12,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-20 23:53:12,452 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-20 23:53:12,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:12,453 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-20 23:53:12,453 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-20 23:53:12,453 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-20 23:53:12,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-20 23:53:12,454 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:12,454 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 23:53:12,455 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:12,455 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-20 23:53:12,455 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:12,456 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:12,457 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:12,457 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:12,457 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:12,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:12,471 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:12,512 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 23:53:12,513 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:12,513 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:12,513 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-20 23:53:12,513 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 23:53:12,515 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:53:12,515 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:53:13,178 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:53:13,178 INFO L268 AbstractInterpreter]: Visited 34 different actions 110 times. Merged at 22 different actions 51 times. Never widened. Found 9 fixpoints after 5 different actions. Largest state had 21 variables. [2018-01-20 23:53:13,181 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:53:13,181 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:13,181 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:13,189 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:13,189 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:53:13,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:13,218 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:13,268 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 23:53:13,268 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:13,423 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 23:53:13,458 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:13,458 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 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 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:13,475 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:13,475 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:53:13,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:13,503 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:13,508 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 23:53:13,508 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:13,621 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 23:53:13,623 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:13,623 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-20 23:53:13,623 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:13,624 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-20 23:53:13,624 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-20 23:53:13,624 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-20 23:53:13,625 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 5 states. [2018-01-20 23:53:13,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:13,817 INFO L93 Difference]: Finished difference Result 84 states and 94 transitions. [2018-01-20 23:53:13,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:53:13,817 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2018-01-20 23:53:13,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:13,819 INFO L225 Difference]: With dead ends: 84 [2018-01-20 23:53:13,819 INFO L226 Difference]: Without dead ends: 67 [2018-01-20 23:53:13,819 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-20 23:53:13,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-01-20 23:53:13,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 52. [2018-01-20 23:53:13,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-20 23:53:13,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2018-01-20 23:53:13,826 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 36 [2018-01-20 23:53:13,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:13,827 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2018-01-20 23:53:13,827 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-20 23:53:13,827 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2018-01-20 23:53:13,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-20 23:53:13,829 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:13,830 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 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 23:53:13,830 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:13,830 INFO L82 PathProgramCache]: Analyzing trace with hash 1862415341, now seen corresponding path program 2 times [2018-01-20 23:53:13,830 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:13,831 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:13,831 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:13,831 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:13,832 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:13,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:13,851 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:13,931 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-20 23:53:13,932 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:13,932 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:13,932 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:13,932 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:13,932 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:13,932 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:13,950 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:53:13,950 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:13,963 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:13,983 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:13,996 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:13,999 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:14,172 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-20 23:53:14,172 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:14,523 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-20 23:53:14,557 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:14,557 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 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 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:14,566 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:53:14,566 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:14,583 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:14,604 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:14,619 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:14,624 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:14,664 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-20 23:53:14,665 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:14,722 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-20 23:53:14,724 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:14,724 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 16 [2018-01-20 23:53:14,724 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:14,724 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:53:14,724 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:53:14,725 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2018-01-20 23:53:14,725 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 10 states. [2018-01-20 23:53:14,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:14,900 INFO L93 Difference]: Finished difference Result 148 states and 168 transitions. [2018-01-20 23:53:14,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-20 23:53:14,901 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 52 [2018-01-20 23:53:14,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:14,903 INFO L225 Difference]: With dead ends: 148 [2018-01-20 23:53:14,903 INFO L226 Difference]: Without dead ends: 111 [2018-01-20 23:53:14,904 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 193 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-01-20 23:53:14,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-01-20 23:53:14,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 77. [2018-01-20 23:53:14,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-20 23:53:14,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2018-01-20 23:53:14,914 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 52 [2018-01-20 23:53:14,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:14,914 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2018-01-20 23:53:14,914 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:53:14,915 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2018-01-20 23:53:14,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-01-20 23:53:14,917 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:14,917 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 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 23:53:14,917 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:14,918 INFO L82 PathProgramCache]: Analyzing trace with hash 298957008, now seen corresponding path program 3 times [2018-01-20 23:53:14,918 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:14,919 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:14,919 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:14,919 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:14,919 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:14,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:14,942 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:15,032 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-20 23:53:15,032 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:15,032 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:15,032 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:15,033 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:15,033 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:15,033 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:15,038 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:53:15,038 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:53:15,051 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:15,059 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:15,064 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:15,071 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:15,075 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:15,079 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:15,150 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 64 proven. 9 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2018-01-20 23:53:15,150 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:15,283 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 64 proven. 9 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2018-01-20 23:53:15,303 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:15,303 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 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 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:15,310 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:53:15,310 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:53:15,324 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:15,334 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:15,352 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:15,374 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:15,385 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:15,389 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:15,433 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-20 23:53:15,433 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:15,483 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-20 23:53:15,485 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:15,486 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-20 23:53:15,486 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:15,486 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:53:15,487 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:53:15,487 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2018-01-20 23:53:15,487 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand 10 states. [2018-01-20 23:53:15,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:15,668 INFO L93 Difference]: Finished difference Result 194 states and 220 transitions. [2018-01-20 23:53:15,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-20 23:53:15,668 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 78 [2018-01-20 23:53:15,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:15,669 INFO L225 Difference]: With dead ends: 194 [2018-01-20 23:53:15,669 INFO L226 Difference]: Without dead ends: 169 [2018-01-20 23:53:15,670 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 298 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:53:15,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-01-20 23:53:15,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 115. [2018-01-20 23:53:15,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-20 23:53:15,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 130 transitions. [2018-01-20 23:53:15,678 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 130 transitions. Word has length 78 [2018-01-20 23:53:15,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:15,679 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 130 transitions. [2018-01-20 23:53:15,679 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:53:15,679 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 130 transitions. [2018-01-20 23:53:15,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-01-20 23:53:15,681 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:15,682 INFO L322 BasicCegarLoop]: trace histogram [13, 9, 9, 9, 9, 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 23:53:15,682 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:15,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1844537761, now seen corresponding path program 4 times [2018-01-20 23:53:15,682 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:15,683 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:15,683 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:15,683 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:15,683 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:15,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:15,706 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:15,866 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-20 23:53:15,866 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:15,866 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:15,866 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:15,866 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:15,866 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:15,866 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:15,884 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:53:15,884 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:53:15,919 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:15,922 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:16,059 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-20 23:53:16,059 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:16,213 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-20 23:53:16,232 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:16,232 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 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 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:16,235 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:53:16,236 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:53:16,276 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:16,281 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:16,298 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-20 23:53:16,298 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:16,415 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-20 23:53:16,417 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:16,417 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 11, 11, 11] total 20 [2018-01-20 23:53:16,417 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:16,418 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-20 23:53:16,418 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-20 23:53:16,418 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2018-01-20 23:53:16,418 INFO L87 Difference]: Start difference. First operand 115 states and 130 transitions. Second operand 16 states. [2018-01-20 23:53:16,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:16,666 INFO L93 Difference]: Finished difference Result 311 states and 357 transitions. [2018-01-20 23:53:16,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-20 23:53:16,666 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2018-01-20 23:53:16,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:16,669 INFO L225 Difference]: With dead ends: 311 [2018-01-20 23:53:16,669 INFO L226 Difference]: Without dead ends: 241 [2018-01-20 23:53:16,670 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 411 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=156, Invalid=600, Unknown=0, NotChecked=0, Total=756 [2018-01-20 23:53:16,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2018-01-20 23:53:16,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 150. [2018-01-20 23:53:16,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-01-20 23:53:16,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 169 transitions. [2018-01-20 23:53:16,688 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 169 transitions. Word has length 109 [2018-01-20 23:53:16,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:16,689 INFO L432 AbstractCegarLoop]: Abstraction has 150 states and 169 transitions. [2018-01-20 23:53:16,689 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-20 23:53:16,689 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 169 transitions. [2018-01-20 23:53:16,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-01-20 23:53:16,692 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:16,692 INFO L322 BasicCegarLoop]: trace histogram [18, 13, 13, 13, 13, 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 23:53:16,692 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:16,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1349347824, now seen corresponding path program 5 times [2018-01-20 23:53:16,692 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:16,693 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:16,693 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:16,693 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:16,693 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:16,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:16,718 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:16,813 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 580 trivial. 0 not checked. [2018-01-20 23:53:16,813 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:16,813 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:16,813 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:16,813 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:16,813 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:16,813 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:16,819 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:53:16,819 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:16,828 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:16,830 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:16,831 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:16,833 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:16,838 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:16,843 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:16,844 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:16,847 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:16,921 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 392 proven. 49 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-01-20 23:53:16,921 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:17,109 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 95 proven. 270 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2018-01-20 23:53:17,130 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:17,130 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 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 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:17,138 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:53:17,138 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:17,151 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:17,154 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:17,161 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:17,170 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:17,186 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:17,208 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:17,220 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:17,224 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:17,260 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 392 proven. 49 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-01-20 23:53:17,260 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:17,424 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 95 proven. 270 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2018-01-20 23:53:17,426 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:17,426 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 11, 11, 11] total 22 [2018-01-20 23:53:17,426 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:17,426 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-20 23:53:17,427 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-20 23:53:17,427 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:53:17,427 INFO L87 Difference]: Start difference. First operand 150 states and 169 transitions. Second operand 17 states. [2018-01-20 23:53:17,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:17,838 INFO L93 Difference]: Finished difference Result 336 states and 379 transitions. [2018-01-20 23:53:17,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-20 23:53:17,838 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 140 [2018-01-20 23:53:17,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:17,839 INFO L225 Difference]: With dead ends: 336 [2018-01-20 23:53:17,839 INFO L226 Difference]: Without dead ends: 197 [2018-01-20 23:53:17,840 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 539 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=243, Invalid=1089, Unknown=0, NotChecked=0, Total=1332 [2018-01-20 23:53:17,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-01-20 23:53:17,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 151. [2018-01-20 23:53:17,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-01-20 23:53:17,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 166 transitions. [2018-01-20 23:53:17,856 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 166 transitions. Word has length 140 [2018-01-20 23:53:17,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:17,856 INFO L432 AbstractCegarLoop]: Abstraction has 151 states and 166 transitions. [2018-01-20 23:53:17,856 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-20 23:53:17,857 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 166 transitions. [2018-01-20 23:53:17,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-01-20 23:53:17,860 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:17,860 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:53:17,860 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:17,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1936414061, now seen corresponding path program 6 times [2018-01-20 23:53:17,861 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:17,862 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:17,862 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:17,862 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:17,862 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:17,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:17,891 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:18,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:53:18,009 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:18,009 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:18,009 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:18,009 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:18,009 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:18,009 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:18,023 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:53:18,023 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:53:18,038 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,041 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,044 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,046 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,049 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,054 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,059 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,062 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,068 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,069 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:18,073 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:18,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:53:18,120 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:18,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:53:18,326 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:18,326 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 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 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:18,332 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:53:18,332 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:53:18,351 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,361 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,374 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,394 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,416 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,446 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,484 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,595 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,739 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,763 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:18,770 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:18,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:53:18,799 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:18,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:53:18,864 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:18,864 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-20 23:53:18,864 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:18,865 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:53:18,865 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:53:18,865 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:53:18,865 INFO L87 Difference]: Start difference. First operand 151 states and 166 transitions. Second operand 10 states. [2018-01-20 23:53:18,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:18,978 INFO L93 Difference]: Finished difference Result 237 states and 264 transitions. [2018-01-20 23:53:18,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-20 23:53:18,979 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 176 [2018-01-20 23:53:18,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:18,981 INFO L225 Difference]: With dead ends: 237 [2018-01-20 23:53:18,981 INFO L226 Difference]: Without dead ends: 200 [2018-01-20 23:53:18,981 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 696 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:53:18,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-01-20 23:53:18,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 160. [2018-01-20 23:53:18,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-01-20 23:53:18,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 177 transitions. [2018-01-20 23:53:18,995 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 177 transitions. Word has length 176 [2018-01-20 23:53:18,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:18,995 INFO L432 AbstractCegarLoop]: Abstraction has 160 states and 177 transitions. [2018-01-20 23:53:18,995 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:53:18,995 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 177 transitions. [2018-01-20 23:53:18,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-01-20 23:53:18,997 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:18,997 INFO L322 BasicCegarLoop]: trace histogram [29, 22, 22, 22, 22, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:53:18,997 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:18,998 INFO L82 PathProgramCache]: Analyzing trace with hash -984621276, now seen corresponding path program 7 times [2018-01-20 23:53:18,998 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:18,998 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:18,998 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:18,998 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:18,999 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:19,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:19,026 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:19,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-01-20 23:53:19,174 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:19,174 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:19,174 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:19,174 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:19,174 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:19,174 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:19,179 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:19,179 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:53:19,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:19,228 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:19,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 1134 proven. 38 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2018-01-20 23:53:19,359 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:19,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 378 proven. 240 refuted. 0 times theorem prover too weak. 1090 trivial. 0 not checked. [2018-01-20 23:53:19,633 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:19,633 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 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 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:19,636 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:19,637 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:53:19,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:19,726 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:19,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 1134 proven. 38 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2018-01-20 23:53:19,768 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:19,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 378 proven. 240 refuted. 0 times theorem prover too weak. 1090 trivial. 0 not checked. [2018-01-20 23:53:20,002 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:20,002 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 13, 13] total 26 [2018-01-20 23:53:20,002 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:20,003 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-20 23:53:20,003 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-20 23:53:20,003 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-01-20 23:53:20,003 INFO L87 Difference]: Start difference. First operand 160 states and 177 transitions. Second operand 21 states. [2018-01-20 23:53:20,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:20,345 INFO L93 Difference]: Finished difference Result 392 states and 439 transitions. [2018-01-20 23:53:20,346 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-20 23:53:20,346 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 207 [2018-01-20 23:53:20,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:20,348 INFO L225 Difference]: With dead ends: 392 [2018-01-20 23:53:20,348 INFO L226 Difference]: Without dead ends: 305 [2018-01-20 23:53:20,349 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 798 SyntacticMatches, 14 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=270, Invalid=1136, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:53:20,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2018-01-20 23:53:20,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 200. [2018-01-20 23:53:20,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-01-20 23:53:20,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 222 transitions. [2018-01-20 23:53:20,364 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 222 transitions. Word has length 207 [2018-01-20 23:53:20,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:20,365 INFO L432 AbstractCegarLoop]: Abstraction has 200 states and 222 transitions. [2018-01-20 23:53:20,365 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-20 23:53:20,365 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 222 transitions. [2018-01-20 23:53:20,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-01-20 23:53:20,367 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:20,367 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:53:20,367 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:20,367 INFO L82 PathProgramCache]: Analyzing trace with hash 446009255, now seen corresponding path program 8 times [2018-01-20 23:53:20,367 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:20,368 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:20,368 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:20,368 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:20,368 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:20,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:20,401 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:20,579 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-20 23:53:20,579 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:20,579 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:20,579 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:20,580 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:20,580 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:20,580 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:20,585 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:53:20,585 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:20,602 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:20,627 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:20,632 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:20,637 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:20,791 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 1895 proven. 60 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2018-01-20 23:53:20,791 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:21,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 623 proven. 360 refuted. 0 times theorem prover too weak. 1996 trivial. 0 not checked. [2018-01-20 23:53:21,081 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:21,081 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 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 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:21,084 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:53:21,084 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:21,105 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:21,158 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:21,194 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:21,202 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:21,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 1895 proven. 60 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2018-01-20 23:53:21,239 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:21,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 623 proven. 360 refuted. 0 times theorem prover too weak. 1996 trivial. 0 not checked. [2018-01-20 23:53:21,420 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:21,420 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15, 15, 15] total 30 [2018-01-20 23:53:21,421 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:21,421 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-20 23:53:21,421 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-20 23:53:21,422 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2018-01-20 23:53:21,422 INFO L87 Difference]: Start difference. First operand 200 states and 222 transitions. Second operand 24 states. [2018-01-20 23:53:21,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:21,908 INFO L93 Difference]: Finished difference Result 489 states and 547 transitions. [2018-01-20 23:53:21,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-20 23:53:21,908 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 258 [2018-01-20 23:53:21,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:21,910 INFO L225 Difference]: With dead ends: 489 [2018-01-20 23:53:21,911 INFO L226 Difference]: Without dead ends: 390 [2018-01-20 23:53:21,912 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1055 GetRequests, 997 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=352, Invalid=1540, Unknown=0, NotChecked=0, Total=1892 [2018-01-20 23:53:21,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2018-01-20 23:53:21,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 245. [2018-01-20 23:53:21,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-01-20 23:53:21,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 273 transitions. [2018-01-20 23:53:21,933 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 273 transitions. Word has length 258 [2018-01-20 23:53:21,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:21,934 INFO L432 AbstractCegarLoop]: Abstraction has 245 states and 273 transitions. [2018-01-20 23:53:21,934 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-20 23:53:21,934 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 273 transitions. [2018-01-20 23:53:21,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-01-20 23:53:21,951 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:21,951 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:53:21,951 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:21,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1567268592, now seen corresponding path program 9 times [2018-01-20 23:53:21,951 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:21,952 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:21,952 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:21,952 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:21,952 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:21,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:21,982 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:22,330 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-20 23:53:22,331 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:22,331 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:22,331 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:22,331 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:22,331 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:22,331 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:22,337 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:53:22,337 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:53:22,360 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,365 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,368 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,373 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,378 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,384 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,389 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,400 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,402 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:22,410 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:22,596 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-20 23:53:22,596 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:22,878 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-20 23:53:22,899 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:22,899 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 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 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:22,902 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:53:22,902 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:53:22,928 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,937 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,956 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,980 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,039 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,158 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,418 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,852 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,876 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:23,884 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:23,928 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-20 23:53:23,928 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:24,400 WARN L143 SmtUtils]: Spent 129ms on a formula simplification that was a NOOP. DAG size: 30 [2018-01-20 23:53:24,560 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-20 23:53:24,564 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:24,564 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-01-20 23:53:24,564 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:24,565 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-20 23:53:24,565 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-20 23:53:24,565 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2018-01-20 23:53:24,566 INFO L87 Difference]: Start difference. First operand 245 states and 273 transitions. Second operand 20 states. [2018-01-20 23:53:24,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:24,906 INFO L93 Difference]: Finished difference Result 564 states and 641 transitions. [2018-01-20 23:53:24,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-20 23:53:24,906 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 314 [2018-01-20 23:53:24,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:24,908 INFO L225 Difference]: With dead ends: 564 [2018-01-20 23:53:24,908 INFO L226 Difference]: Without dead ends: 515 [2018-01-20 23:53:24,909 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1273 GetRequests, 1236 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2018-01-20 23:53:24,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2018-01-20 23:53:24,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 303. [2018-01-20 23:53:24,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 303 states. [2018-01-20 23:53:24,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 343 transitions. [2018-01-20 23:53:24,930 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 343 transitions. Word has length 314 [2018-01-20 23:53:24,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:24,930 INFO L432 AbstractCegarLoop]: Abstraction has 303 states and 343 transitions. [2018-01-20 23:53:24,931 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-20 23:53:24,931 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 343 transitions. [2018-01-20 23:53:24,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2018-01-20 23:53:24,934 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:24,934 INFO L322 BasicCegarLoop]: trace histogram [59, 49, 49, 49, 49, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:53:24,934 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:24,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1827967461, now seen corresponding path program 10 times [2018-01-20 23:53:24,934 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:24,935 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:24,935 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:24,935 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:24,935 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:24,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:24,981 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:25,346 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 7130 trivial. 0 not checked. [2018-01-20 23:53:25,346 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:25,346 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:25,346 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:25,346 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:25,346 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:25,347 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:25,351 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:53:25,352 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:53:25,410 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:25,415 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:25,706 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 4311 proven. 119 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2018-01-20 23:53:25,706 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:26,123 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 1401 proven. 675 refuted. 0 times theorem prover too weak. 5299 trivial. 0 not checked. [2018-01-20 23:53:26,144 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:26,144 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 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 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:26,147 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:53:26,147 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:53:26,275 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:26,287 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:26,367 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 4311 proven. 119 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2018-01-20 23:53:26,367 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:26,749 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 1401 proven. 675 refuted. 0 times theorem prover too weak. 5299 trivial. 0 not checked. [2018-01-20 23:53:26,750 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:26,751 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 38 [2018-01-20 23:53:26,751 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:26,751 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-20 23:53:26,751 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-20 23:53:26,752 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1149, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:53:26,752 INFO L87 Difference]: Start difference. First operand 303 states and 343 transitions. Second operand 30 states. [2018-01-20 23:53:27,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:27,879 INFO L93 Difference]: Finished difference Result 751 states and 858 transitions. [2018-01-20 23:53:27,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-20 23:53:27,880 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 375 [2018-01-20 23:53:27,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:27,884 INFO L225 Difference]: With dead ends: 751 [2018-01-20 23:53:27,884 INFO L226 Difference]: Without dead ends: 618 [2018-01-20 23:53:27,886 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1529 GetRequests, 1455 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=549, Invalid=2531, Unknown=0, NotChecked=0, Total=3080 [2018-01-20 23:53:27,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2018-01-20 23:53:27,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 358. [2018-01-20 23:53:27,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 358 states. [2018-01-20 23:53:27,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 403 transitions. [2018-01-20 23:53:27,913 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 403 transitions. Word has length 375 [2018-01-20 23:53:27,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:27,913 INFO L432 AbstractCegarLoop]: Abstraction has 358 states and 403 transitions. [2018-01-20 23:53:27,913 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-20 23:53:27,913 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 403 transitions. [2018-01-20 23:53:27,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2018-01-20 23:53:27,916 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:27,917 INFO L322 BasicCegarLoop]: trace histogram [70, 59, 59, 59, 59, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:53:27,917 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:27,917 INFO L82 PathProgramCache]: Analyzing trace with hash -940109232, now seen corresponding path program 11 times [2018-01-20 23:53:27,917 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:27,918 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:27,918 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:27,918 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:27,919 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:27,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:27,968 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:28,388 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 10183 trivial. 0 not checked. [2018-01-20 23:53:28,389 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:28,389 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:28,389 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:28,389 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:28,389 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:28,389 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:28,395 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:53:28,395 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:28,426 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:28,449 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:28,461 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:28,470 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:28,478 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:28,488 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:28,495 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:28,502 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:28,504 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:28,511 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:28,816 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 6200 proven. 517 refuted. 0 times theorem prover too weak. 3763 trivial. 0 not checked. [2018-01-20 23:53:28,816 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:29,382 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 1065 proven. 2348 refuted. 0 times theorem prover too weak. 7067 trivial. 0 not checked. [2018-01-20 23:53:29,402 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:29,402 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 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 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:29,405 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:53:29,405 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:29,435 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,446 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,470 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,511 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,647 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,725 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,822 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,949 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,990 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:30,000 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:30,161 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 6116 proven. 427 refuted. 0 times theorem prover too weak. 3937 trivial. 0 not checked. [2018-01-20 23:53:30,161 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:30,656 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 971 proven. 1932 refuted. 0 times theorem prover too weak. 7577 trivial. 0 not checked. [2018-01-20 23:53:30,659 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:30,659 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19, 19, 19] total 47 [2018-01-20 23:53:30,659 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:30,660 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-20 23:53:30,661 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-20 23:53:30,661 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1871, Unknown=0, NotChecked=0, Total=2162 [2018-01-20 23:53:30,662 INFO L87 Difference]: Start difference. First operand 358 states and 403 transitions. Second operand 31 states. [2018-01-20 23:53:32,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:32,098 INFO L93 Difference]: Finished difference Result 835 states and 939 transitions. [2018-01-20 23:53:32,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-01-20 23:53:32,099 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 436 [2018-01-20 23:53:32,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:32,102 INFO L225 Difference]: With dead ends: 835 [2018-01-20 23:53:32,102 INFO L226 Difference]: Without dead ends: 469 [2018-01-20 23:53:32,107 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1785 GetRequests, 1693 SyntacticMatches, 18 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1741 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=906, Invalid=4794, Unknown=0, NotChecked=0, Total=5700 [2018-01-20 23:53:32,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2018-01-20 23:53:32,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 364. [2018-01-20 23:53:32,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2018-01-20 23:53:32,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 400 transitions. [2018-01-20 23:53:32,138 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 400 transitions. Word has length 436 [2018-01-20 23:53:32,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:32,139 INFO L432 AbstractCegarLoop]: Abstraction has 364 states and 400 transitions. [2018-01-20 23:53:32,139 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-20 23:53:32,139 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 400 transitions. [2018-01-20 23:53:32,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2018-01-20 23:53:32,144 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:32,144 INFO L322 BasicCegarLoop]: trace histogram [80, 68, 68, 68, 68, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:53:32,145 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:32,145 INFO L82 PathProgramCache]: Analyzing trace with hash 270709555, now seen corresponding path program 12 times [2018-01-20 23:53:32,145 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:32,146 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:32,146 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:32,146 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:32,146 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:32,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:32,198 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:32,726 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 13418 trivial. 0 not checked. [2018-01-20 23:53:32,726 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:32,726 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:32,726 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:32,726 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:32,726 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:32,726 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:32,731 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:53:32,732 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:53:32,761 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,767 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,770 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,775 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,782 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,793 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,800 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,808 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,819 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,829 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,840 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,853 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,866 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,879 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,896 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,909 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,923 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,942 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,955 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:32,956 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:32,964 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:33,187 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 2797 proven. 156 refuted. 0 times theorem prover too weak. 10819 trivial. 0 not checked. [2018-01-20 23:53:33,187 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:33,686 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 2797 proven. 156 refuted. 0 times theorem prover too weak. 10819 trivial. 0 not checked. [2018-01-20 23:53:33,707 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:33,720 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 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 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:33,724 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:53:33,724 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:53:33,758 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:33,770 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:33,802 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:33,842 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:33,908 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:34,116 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:34,976 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:38,173 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:50,208 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:02,261 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown