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/memset3_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:54:11,105 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:54:11,108 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:54:11,121 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:54:11,121 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:54:11,122 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:54:11,123 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:54:11,125 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:54:11,127 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:54:11,128 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:54:11,129 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:54:11,129 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:54:11,130 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:54:11,130 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:54:11,131 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:54:11,133 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:54:11,136 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:54:11,138 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:54:11,139 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:54:11,140 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:54:11,142 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-20 23:54:11,147 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:54:11,148 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:54:11,148 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 23:54:11,159 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:54:11,159 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:54:11,160 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:54:11,160 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:54:11,160 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:54:11,160 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:54:11,161 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:54:11,161 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:54:11,161 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:54:11,162 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:54:11,162 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:54:11,162 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:54:11,162 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:54:11,162 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:54:11,162 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:54:11,163 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:54:11,163 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:54:11,163 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:54:11,163 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:54:11,163 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:54:11,164 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:54:11,164 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:54:11,164 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:54:11,164 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:54:11,164 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:54:11,165 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:54:11,165 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:54:11,165 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:54:11,165 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:54:11,165 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:54:11,166 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:54:11,166 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:54:11,166 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:54:11,166 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:54:11,166 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:54:11,166 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:54:11,167 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:54:11,168 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:54:11,202 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:54:11,215 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:54:11,219 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:54:11,220 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:54:11,221 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:54:11,221 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/memset3_true-valid-memsafety_true-termination.c [2018-01-20 23:54:11,353 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:54:11,359 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:54:11,360 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:54:11,360 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:54:11,367 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:54:11,368 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:54:11" (1/1) ... [2018-01-20 23:54:11,371 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c111afb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11, skipping insertion in model container [2018-01-20 23:54:11,372 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:54:11" (1/1) ... [2018-01-20 23:54:11,390 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:54:11,409 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:54:11,527 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:54:11,540 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:54:11,545 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11 WrapperNode [2018-01-20 23:54:11,546 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:54:11,547 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:54:11,547 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:54:11,547 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:54:11,564 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11" (1/1) ... [2018-01-20 23:54:11,564 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11" (1/1) ... [2018-01-20 23:54:11,574 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11" (1/1) ... [2018-01-20 23:54:11,574 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11" (1/1) ... [2018-01-20 23:54:11,576 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11" (1/1) ... [2018-01-20 23:54:11,578 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11" (1/1) ... [2018-01-20 23:54:11,579 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11" (1/1) ... [2018-01-20 23:54:11,580 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:54:11,581 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:54:11,581 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:54:11,581 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:54:11,582 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:54:11,630 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:54:11,630 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:54:11,630 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:54:11,630 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:54:11,630 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:54:11,631 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:54:11,631 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2018-01-20 23:54:11,631 INFO L136 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2018-01-20 23:54:11,631 INFO L128 BoogieDeclarations]: Found specification of procedure memset [2018-01-20 23:54:11,631 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:54:11,631 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:54:11,631 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:54:11,763 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:54:11,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:54:11 BoogieIcfgContainer [2018-01-20 23:54:11,763 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:54:11,764 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:54:11,764 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:54:11,766 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:54:11,766 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:54:11" (1/3) ... [2018-01-20 23:54:11,767 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@140fe26b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:54:11, skipping insertion in model container [2018-01-20 23:54:11,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:11" (2/3) ... [2018-01-20 23:54:11,768 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@140fe26b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:54:11, skipping insertion in model container [2018-01-20 23:54:11,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:54:11" (3/3) ... [2018-01-20 23:54:11,771 INFO L105 eAbstractionObserver]: Analyzing ICFG memset3_true-valid-memsafety_true-termination.c [2018-01-20 23:54:11,778 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:54:11,784 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-20 23:54:11,819 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:54:11,820 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:54:11,820 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:54:11,820 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:54:11,820 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:54:11,820 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:54:11,820 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:54:11,820 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:54:11,821 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:54:11,836 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-20 23:54:11,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:54:11,842 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:11,843 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:54:11,843 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:54:11,851 INFO L82 PathProgramCache]: Analyzing trace with hash 51896, now seen corresponding path program 1 times [2018-01-20 23:54:11,854 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:11,900 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:11,901 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:11,901 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:11,901 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:11,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:54:11,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:54:11,959 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:54:11,965 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:54:11,972 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:54:11,972 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:54:11,972 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:54:11,972 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:54:11,972 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:54:11,972 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:54:11,972 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:54:11,972 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:54:11,972 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:54:11,973 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-20 23:54:11,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-20 23:54:11,974 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:11,974 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:11,975 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:11,975 INFO L82 PathProgramCache]: Analyzing trace with hash 126067280, now seen corresponding path program 1 times [2018-01-20 23:54:11,975 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:11,976 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:11,977 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:11,977 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:11,977 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:11,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:12,006 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:12,105 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 23:54:12,107 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:54:12,107 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-20 23:54:12,107 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:54:12,109 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-20 23:54:12,119 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-20 23:54:12,120 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-20 23:54:12,122 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2018-01-20 23:54:12,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:12,171 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-20 23:54:12,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:54:12,173 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2018-01-20 23:54:12,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:12,245 INFO L225 Difference]: With dead ends: 34 [2018-01-20 23:54:12,246 INFO L226 Difference]: Without dead ends: 20 [2018-01-20 23:54:12,249 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-20 23:54:12,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-01-20 23:54:12,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-01-20 23:54:12,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-01-20 23:54:12,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-01-20 23:54:12,278 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-01-20 23:54:12,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:12,279 INFO L432 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-01-20 23:54:12,279 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-20 23:54:12,279 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-01-20 23:54:12,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:54:12,280 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:12,280 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 23:54:12,280 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:12,280 INFO L82 PathProgramCache]: Analyzing trace with hash 763300235, now seen corresponding path program 1 times [2018-01-20 23:54:12,280 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:12,281 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:12,281 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:12,282 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:12,282 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:12,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:12,299 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:12,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,376 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:12,376 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:12,377 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-01-20 23:54:12,379 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [9], [10], [14], [15], [16], [18], [19], [20], [21], [23], [24], [25], [26], [27], [28] [2018-01-20 23:54:12,423 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:54:12,423 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:54:12,695 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:54:12,697 INFO L268 AbstractInterpreter]: Visited 19 different actions 23 times. Merged at 3 different actions 3 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 15 variables. [2018-01-20 23:54:12,710 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:54:12,710 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:12,710 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 23:54:12,722 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:12,722 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:12,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:12,751 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:12,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,817 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:12,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,968 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:12,968 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:12,973 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:12,973 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:12,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:13,003 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:13,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,010 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:13,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,083 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:13,083 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 11 [2018-01-20 23:54:13,084 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:13,085 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-20 23:54:13,085 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-20 23:54:13,085 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:54:13,086 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 8 states. [2018-01-20 23:54:13,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:13,128 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-01-20 23:54:13,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:54:13,132 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2018-01-20 23:54:13,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:13,134 INFO L225 Difference]: With dead ends: 30 [2018-01-20 23:54:13,134 INFO L226 Difference]: Without dead ends: 21 [2018-01-20 23:54:13,135 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2018-01-20 23:54:13,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-01-20 23:54:13,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-01-20 23:54:13,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-01-20 23:54:13,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-01-20 23:54:13,140 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-01-20 23:54:13,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:13,140 INFO L432 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-01-20 23:54:13,140 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-20 23:54:13,140 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-01-20 23:54:13,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-20 23:54:13,141 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:13,141 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:13,141 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:13,141 INFO L82 PathProgramCache]: Analyzing trace with hash -957314640, now seen corresponding path program 2 times [2018-01-20 23:54:13,141 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:13,142 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:13,142 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:13,143 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:13,143 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:13,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:13,155 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:13,252 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,253 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,253 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:13,253 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:13,253 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:13,254 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,254 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:13,267 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:13,268 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:13,283 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:13,286 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:13,287 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:13,289 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:13,324 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,325 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:13,433 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,454 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,454 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:13,457 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:13,458 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:13,472 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:13,479 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:13,485 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:13,489 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:13,502 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,502 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:13,587 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,588 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:13,588 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 14 [2018-01-20 23:54:13,588 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:13,588 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:54:13,589 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:54:13,589 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=113, Unknown=0, NotChecked=0, Total=182 [2018-01-20 23:54:13,589 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 10 states. [2018-01-20 23:54:13,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:13,628 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-01-20 23:54:13,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-20 23:54:13,629 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2018-01-20 23:54:13,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:13,630 INFO L225 Difference]: With dead ends: 31 [2018-01-20 23:54:13,630 INFO L226 Difference]: Without dead ends: 22 [2018-01-20 23:54:13,631 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2018-01-20 23:54:13,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-01-20 23:54:13,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-01-20 23:54:13,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-01-20 23:54:13,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-01-20 23:54:13,634 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-01-20 23:54:13,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:13,635 INFO L432 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-01-20 23:54:13,635 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:54:13,635 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-01-20 23:54:13,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-20 23:54:13,636 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:13,636 INFO L322 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:13,636 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:13,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1538199083, now seen corresponding path program 3 times [2018-01-20 23:54:13,636 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:13,637 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:13,637 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:13,638 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:13,638 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:13,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:13,651 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:13,710 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,710 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,710 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:13,710 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:13,711 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:13,711 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,711 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:13,721 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:13,721 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:13,731 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:13,733 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:13,733 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:13,734 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:13,736 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:13,768 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,768 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:13,914 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,934 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,934 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:13,941 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:13,941 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:13,956 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:13,967 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:13,979 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:13,985 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:13,987 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:13,992 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,992 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:14,030 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,031 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:14,032 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 17 [2018-01-20 23:54:14,032 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:14,032 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-20 23:54:14,032 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-20 23:54:14,033 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:54:14,033 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 12 states. [2018-01-20 23:54:14,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:14,059 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-01-20 23:54:14,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-20 23:54:14,060 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2018-01-20 23:54:14,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:14,061 INFO L225 Difference]: With dead ends: 32 [2018-01-20 23:54:14,061 INFO L226 Difference]: Without dead ends: 23 [2018-01-20 23:54:14,061 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=191, Unknown=0, NotChecked=0, Total=306 [2018-01-20 23:54:14,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-01-20 23:54:14,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-01-20 23:54:14,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-01-20 23:54:14,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-01-20 23:54:14,065 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-01-20 23:54:14,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:14,066 INFO L432 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-01-20 23:54:14,066 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-20 23:54:14,066 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-01-20 23:54:14,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-20 23:54:14,067 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:14,067 INFO L322 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:14,067 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:14,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1589713168, now seen corresponding path program 4 times [2018-01-20 23:54:14,067 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:14,068 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:14,068 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:14,069 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:14,069 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:14,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:14,082 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:14,145 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,146 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,146 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:14,146 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:14,146 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:14,146 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,146 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:14,151 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:14,151 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:14,163 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:14,165 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:14,194 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,195 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:14,335 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,355 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,355 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:14,358 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:14,358 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:14,381 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:14,385 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:14,391 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,391 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:14,492 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,493 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:14,493 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-20 23:54:14,493 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:14,494 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-20 23:54:14,494 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-20 23:54:14,494 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=239, Unknown=0, NotChecked=0, Total=380 [2018-01-20 23:54:14,495 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 14 states. [2018-01-20 23:54:14,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:14,520 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-01-20 23:54:14,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-20 23:54:14,521 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 22 [2018-01-20 23:54:14,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:14,521 INFO L225 Difference]: With dead ends: 33 [2018-01-20 23:54:14,522 INFO L226 Difference]: Without dead ends: 24 [2018-01-20 23:54:14,522 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=156, Invalid=264, Unknown=0, NotChecked=0, Total=420 [2018-01-20 23:54:14,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-01-20 23:54:14,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-01-20 23:54:14,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-01-20 23:54:14,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-01-20 23:54:14,525 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-01-20 23:54:14,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:14,526 INFO L432 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-01-20 23:54:14,526 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-20 23:54:14,526 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-01-20 23:54:14,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-01-20 23:54:14,526 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:14,527 INFO L322 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:14,527 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:14,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1108317493, now seen corresponding path program 5 times [2018-01-20 23:54:14,527 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:14,528 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:14,528 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:14,528 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:14,528 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:14,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:14,539 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:14,646 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,646 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,646 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:14,646 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:14,647 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:14,647 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,647 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:14,660 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:14,660 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:14,666 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:14,667 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:14,668 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:14,673 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:14,674 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:14,676 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:14,719 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,719 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:14,855 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,875 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,876 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:14,878 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:14,879 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:14,883 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:14,885 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:14,890 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:14,902 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:14,909 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:14,913 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:14,919 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,919 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:14,970 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,971 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:14,972 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-20 23:54:14,972 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:14,972 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-20 23:54:14,972 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-20 23:54:14,972 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=320, Unknown=0, NotChecked=0, Total=506 [2018-01-20 23:54:14,972 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2018-01-20 23:54:14,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:14,998 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-20 23:54:14,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-20 23:54:14,999 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2018-01-20 23:54:14,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:14,999 INFO L225 Difference]: With dead ends: 34 [2018-01-20 23:54:14,999 INFO L226 Difference]: Without dead ends: 25 [2018-01-20 23:54:15,000 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2018-01-20 23:54:15,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-01-20 23:54:15,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-01-20 23:54:15,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-01-20 23:54:15,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-01-20 23:54:15,003 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-01-20 23:54:15,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:15,003 INFO L432 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-01-20 23:54:15,003 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-20 23:54:15,003 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-01-20 23:54:15,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-20 23:54:15,004 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:15,004 INFO L322 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:15,004 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:15,004 INFO L82 PathProgramCache]: Analyzing trace with hash 1152077936, now seen corresponding path program 6 times [2018-01-20 23:54:15,004 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:15,005 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:15,005 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:15,005 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:15,005 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:15,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:15,016 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:15,090 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,090 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:15,090 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:15,090 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:15,090 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:15,090 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:15,090 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:15,099 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:15,099 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:15,107 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:15,109 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:15,111 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:15,112 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:15,112 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:15,114 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:15,156 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,156 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:15,303 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,324 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:15,324 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:15,330 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:15,331 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:15,346 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:15,357 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:15,370 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:15,383 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:15,393 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:15,397 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:15,404 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,404 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:15,550 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (13)] Exception during sending of exit command (exit): Broken pipe [2018-01-20 23:54:15,553 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:15,553 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 26 [2018-01-20 23:54:15,553 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:15,553 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-20 23:54:15,554 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-20 23:54:15,554 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=413, Unknown=0, NotChecked=0, Total=650 [2018-01-20 23:54:15,554 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 18 states. [2018-01-20 23:54:15,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:15,621 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-01-20 23:54:15,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-20 23:54:15,621 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2018-01-20 23:54:15,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:15,622 INFO L225 Difference]: With dead ends: 35 [2018-01-20 23:54:15,622 INFO L226 Difference]: Without dead ends: 26 [2018-01-20 23:54:15,622 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=256, Invalid=446, Unknown=0, NotChecked=0, Total=702 [2018-01-20 23:54:15,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-01-20 23:54:15,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-01-20 23:54:15,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-01-20 23:54:15,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-01-20 23:54:15,625 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-01-20 23:54:15,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:15,625 INFO L432 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-01-20 23:54:15,626 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-20 23:54:15,626 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-01-20 23:54:15,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-20 23:54:15,626 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:15,626 INFO L322 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:15,626 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:15,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1790107797, now seen corresponding path program 7 times [2018-01-20 23:54:15,627 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:15,627 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:15,627 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:15,627 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:15,628 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:15,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:15,646 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:15,766 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:15,767 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:15,767 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:15,767 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:15,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:15,767 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:15,773 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:15,773 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:15,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:15,784 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:15,841 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,841 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:16,006 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,026 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:16,026 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:16,030 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:16,030 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:16,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:16,050 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:16,054 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,054 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:16,107 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,108 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:16,109 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-20 23:54:16,109 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:16,109 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-20 23:54:16,110 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-20 23:54:16,110 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=518, Unknown=0, NotChecked=0, Total=812 [2018-01-20 23:54:16,110 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 20 states. [2018-01-20 23:54:16,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:16,145 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-01-20 23:54:16,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-20 23:54:16,145 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 25 [2018-01-20 23:54:16,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:16,146 INFO L225 Difference]: With dead ends: 36 [2018-01-20 23:54:16,146 INFO L226 Difference]: Without dead ends: 27 [2018-01-20 23:54:16,147 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=315, Invalid=555, Unknown=0, NotChecked=0, Total=870 [2018-01-20 23:54:16,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-01-20 23:54:16,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-01-20 23:54:16,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-01-20 23:54:16,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-01-20 23:54:16,151 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-01-20 23:54:16,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:16,152 INFO L432 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-01-20 23:54:16,152 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-20 23:54:16,152 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-01-20 23:54:16,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-20 23:54:16,153 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:16,153 INFO L322 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:16,153 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:16,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1491414992, now seen corresponding path program 8 times [2018-01-20 23:54:16,153 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:16,154 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:16,154 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:16,154 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:16,155 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:16,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:16,166 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:16,337 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,338 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:16,338 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:16,338 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:16,338 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:16,338 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:16,338 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:16,346 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:16,346 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:16,354 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:16,359 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:16,360 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:16,361 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:16,431 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,431 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:16,640 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,660 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:16,660 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:16,663 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:16,663 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:16,673 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:16,682 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:16,689 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:16,693 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:16,699 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,699 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:16,781 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,782 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:16,782 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-20 23:54:16,782 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:16,783 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-20 23:54:16,783 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-20 23:54:16,783 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=635, Unknown=0, NotChecked=0, Total=992 [2018-01-20 23:54:16,784 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 22 states. [2018-01-20 23:54:16,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:16,824 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-01-20 23:54:16,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-20 23:54:16,825 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 26 [2018-01-20 23:54:16,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:16,825 INFO L225 Difference]: With dead ends: 37 [2018-01-20 23:54:16,826 INFO L226 Difference]: Without dead ends: 28 [2018-01-20 23:54:16,826 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=676, Unknown=0, NotChecked=0, Total=1056 [2018-01-20 23:54:16,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-01-20 23:54:16,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-01-20 23:54:16,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-01-20 23:54:16,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-01-20 23:54:16,830 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-01-20 23:54:16,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:16,830 INFO L432 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-01-20 23:54:16,831 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-20 23:54:16,831 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-01-20 23:54:16,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-20 23:54:16,831 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:16,831 INFO L322 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:16,832 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:16,832 INFO L82 PathProgramCache]: Analyzing trace with hash 139406347, now seen corresponding path program 9 times [2018-01-20 23:54:16,832 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:16,832 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:16,833 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:16,833 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:16,833 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:16,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:16,842 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:17,006 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,006 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:17,006 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:17,006 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:17,006 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:17,006 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:17,007 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:17,012 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:17,012 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:17,019 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,021 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,022 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,023 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,024 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,025 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,026 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:17,027 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:17,096 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,097 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:17,316 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,337 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:17,337 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:17,340 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:17,340 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:17,350 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,357 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,365 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,374 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,383 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,393 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:17,400 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:17,403 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:17,407 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,407 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:17,489 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,490 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:17,491 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 35 [2018-01-20 23:54:17,491 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:17,491 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-20 23:54:17,491 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-20 23:54:17,492 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=764, Unknown=0, NotChecked=0, Total=1190 [2018-01-20 23:54:17,492 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 24 states. [2018-01-20 23:54:17,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:17,536 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-01-20 23:54:17,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-20 23:54:17,536 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 27 [2018-01-20 23:54:17,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:17,537 INFO L225 Difference]: With dead ends: 38 [2018-01-20 23:54:17,537 INFO L226 Difference]: Without dead ends: 29 [2018-01-20 23:54:17,538 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=451, Invalid=809, Unknown=0, NotChecked=0, Total=1260 [2018-01-20 23:54:17,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-01-20 23:54:17,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-01-20 23:54:17,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-01-20 23:54:17,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-01-20 23:54:17,541 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-01-20 23:54:17,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:17,542 INFO L432 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-01-20 23:54:17,542 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-20 23:54:17,542 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-01-20 23:54:17,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-20 23:54:17,543 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:17,543 INFO L322 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:17,543 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:17,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1176811312, now seen corresponding path program 10 times [2018-01-20 23:54:17,543 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:17,544 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:17,544 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:17,544 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:17,544 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:17,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:17,552 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:17,662 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,663 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:17,663 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:17,663 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:17,663 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:17,663 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:17,663 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:17,668 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:17,668 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:17,678 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:17,679 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:17,751 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,751 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:18,003 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,023 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:18,023 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:18,026 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:18,026 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:18,051 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:18,054 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:18,058 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,059 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:18,131 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,133 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:18,133 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-20 23:54:18,133 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:18,133 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-20 23:54:18,134 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-20 23:54:18,134 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=905, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:54:18,134 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 26 states. [2018-01-20 23:54:18,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:18,163 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-01-20 23:54:18,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-20 23:54:18,164 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2018-01-20 23:54:18,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:18,164 INFO L225 Difference]: With dead ends: 39 [2018-01-20 23:54:18,165 INFO L226 Difference]: Without dead ends: 30 [2018-01-20 23:54:18,165 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=528, Invalid=954, Unknown=0, NotChecked=0, Total=1482 [2018-01-20 23:54:18,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-01-20 23:54:18,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-01-20 23:54:18,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-01-20 23:54:18,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-01-20 23:54:18,168 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-01-20 23:54:18,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:18,168 INFO L432 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-01-20 23:54:18,168 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-20 23:54:18,169 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-01-20 23:54:18,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-20 23:54:18,169 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:18,169 INFO L322 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:18,169 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:18,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1023373141, now seen corresponding path program 11 times [2018-01-20 23:54:18,169 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:18,170 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:18,170 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:18,170 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:18,170 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:18,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:18,179 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:18,308 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,308 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:18,308 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:18,308 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:18,308 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:18,308 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:18,308 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:18,314 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:18,314 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:18,317 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,318 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,319 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,320 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,321 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,322 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,325 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,326 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:18,328 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:18,420 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,421 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:18,715 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,736 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:18,736 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:18,740 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:18,740 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:18,744 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,745 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,749 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,752 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,757 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,761 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,771 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,779 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:18,782 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:18,789 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,789 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:18,879 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,880 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:18,880 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-20 23:54:18,880 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:18,881 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-20 23:54:18,881 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-20 23:54:18,881 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=1058, Unknown=0, NotChecked=0, Total=1640 [2018-01-20 23:54:18,882 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 28 states. [2018-01-20 23:54:18,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:18,929 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-01-20 23:54:18,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-20 23:54:18,929 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 29 [2018-01-20 23:54:18,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:18,929 INFO L225 Difference]: With dead ends: 40 [2018-01-20 23:54:18,930 INFO L226 Difference]: Without dead ends: 31 [2018-01-20 23:54:18,930 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=611, Invalid=1111, Unknown=0, NotChecked=0, Total=1722 [2018-01-20 23:54:18,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-01-20 23:54:18,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-01-20 23:54:18,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-01-20 23:54:18,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-01-20 23:54:18,933 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-01-20 23:54:18,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:18,934 INFO L432 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-01-20 23:54:18,934 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-20 23:54:18,934 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-01-20 23:54:18,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-20 23:54:18,934 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:18,935 INFO L322 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:18,935 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:18,935 INFO L82 PathProgramCache]: Analyzing trace with hash -509614448, now seen corresponding path program 12 times [2018-01-20 23:54:18,935 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:18,936 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:18,936 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:18,936 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:18,936 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:18,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:18,947 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:19,226 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,226 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:19,226 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:19,226 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:19,227 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:19,227 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:19,227 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:19,236 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:19,236 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:19,244 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,245 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,246 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,247 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,248 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,249 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,251 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,251 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:19,252 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:19,332 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,332 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:19,686 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,707 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:19,707 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:19,712 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:19,712 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:19,723 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,734 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,746 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,758 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,771 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,786 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,800 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:19,812 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:19,815 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:19,820 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,820 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:19,967 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,968 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:19,969 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 44 [2018-01-20 23:54:19,969 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:19,969 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-20 23:54:19,969 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-20 23:54:19,970 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=1223, Unknown=0, NotChecked=0, Total=1892 [2018-01-20 23:54:19,970 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-01-20 23:54:20,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:20,017 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-01-20 23:54:20,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-01-20 23:54:20,017 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-01-20 23:54:20,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:20,018 INFO L225 Difference]: With dead ends: 41 [2018-01-20 23:54:20,018 INFO L226 Difference]: Without dead ends: 32 [2018-01-20 23:54:20,018 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=700, Invalid=1280, Unknown=0, NotChecked=0, Total=1980 [2018-01-20 23:54:20,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-01-20 23:54:20,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-01-20 23:54:20,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-01-20 23:54:20,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-01-20 23:54:20,021 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-01-20 23:54:20,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:20,021 INFO L432 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-01-20 23:54:20,021 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-20 23:54:20,021 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-01-20 23:54:20,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-20 23:54:20,022 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:20,022 INFO L322 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:20,022 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:20,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1762964149, now seen corresponding path program 13 times [2018-01-20 23:54:20,022 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:20,023 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:20,023 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:20,023 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:20,023 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:20,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:20,032 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:20,200 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:20,201 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:20,201 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:20,201 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:20,201 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:20,201 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:20,201 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:20,211 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:20,211 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:20,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:20,229 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:20,413 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:20,413 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:20,802 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:20,834 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:20,834 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:20,838 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:20,838 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:20,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:20,864 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:20,870 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:20,870 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:20,982 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:20,984 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:20,984 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-20 23:54:20,984 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:20,985 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-20 23:54:20,985 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-20 23:54:20,986 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=1400, Unknown=0, NotChecked=0, Total=2162 [2018-01-20 23:54:20,986 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 32 states. [2018-01-20 23:54:21,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:21,021 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-01-20 23:54:21,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-20 23:54:21,021 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 31 [2018-01-20 23:54:21,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:21,022 INFO L225 Difference]: With dead ends: 42 [2018-01-20 23:54:21,022 INFO L226 Difference]: Without dead ends: 33 [2018-01-20 23:54:21,023 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=795, Invalid=1461, Unknown=0, NotChecked=0, Total=2256 [2018-01-20 23:54:21,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-01-20 23:54:21,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-01-20 23:54:21,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-01-20 23:54:21,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-01-20 23:54:21,027 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-01-20 23:54:21,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:21,027 INFO L432 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-01-20 23:54:21,027 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-20 23:54:21,027 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-01-20 23:54:21,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-20 23:54:21,028 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:21,028 INFO L322 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:21,028 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:21,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1962099216, now seen corresponding path program 14 times [2018-01-20 23:54:21,028 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:21,029 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:21,029 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:21,029 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:21,029 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:21,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:21,036 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:21,725 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:21,725 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:21,725 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:21,725 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:21,725 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:21,725 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:21,725 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:21,751 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:21,751 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:21,760 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:21,773 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:21,785 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:21,786 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:21,925 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:21,925 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:22,310 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:22,330 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:22,330 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:22,333 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:22,333 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:22,342 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,352 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,360 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:22,363 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:22,369 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:22,369 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:22,465 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:22,466 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:22,466 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-20 23:54:22,466 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:22,466 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-20 23:54:22,467 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-20 23:54:22,467 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=1589, Unknown=0, NotChecked=0, Total=2450 [2018-01-20 23:54:22,467 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 34 states. [2018-01-20 23:54:22,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:22,579 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-01-20 23:54:22,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-20 23:54:22,579 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 32 [2018-01-20 23:54:22,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:22,580 INFO L225 Difference]: With dead ends: 43 [2018-01-20 23:54:22,580 INFO L226 Difference]: Without dead ends: 34 [2018-01-20 23:54:22,581 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=896, Invalid=1654, Unknown=0, NotChecked=0, Total=2550 [2018-01-20 23:54:22,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-01-20 23:54:22,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-01-20 23:54:22,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-01-20 23:54:22,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-01-20 23:54:22,586 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-01-20 23:54:22,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:22,586 INFO L432 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-01-20 23:54:22,586 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-20 23:54:22,587 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-01-20 23:54:22,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-20 23:54:22,587 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:22,587 INFO L322 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:22,587 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:22,588 INFO L82 PathProgramCache]: Analyzing trace with hash 454648299, now seen corresponding path program 15 times [2018-01-20 23:54:22,588 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:22,588 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:22,589 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:22,589 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:22,589 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:22,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:22,598 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:22,846 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:22,847 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:22,847 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:22,847 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:22,847 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:22,847 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:22,847 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:22,857 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:22,857 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:22,865 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:22,867 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:22,868 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:22,869 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:22,870 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:22,879 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:22,880 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:22,887 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:22,888 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:22,894 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:22,895 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:23,066 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:23,066 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:23,695 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:23,727 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:23,728 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:23,731 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:23,731 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:23,745 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:23,756 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:23,768 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:23,780 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:23,793 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:23,807 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:23,819 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:23,830 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:23,841 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:23,849 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:23,852 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:23,857 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:23,857 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:23,975 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:23,976 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:23,976 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 53 [2018-01-20 23:54:23,976 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:23,977 INFO L409 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-01-20 23:54:23,977 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-01-20 23:54:23,978 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=966, Invalid=1790, Unknown=0, NotChecked=0, Total=2756 [2018-01-20 23:54:23,978 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 36 states. [2018-01-20 23:54:24,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:24,018 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-01-20 23:54:24,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-01-20 23:54:24,019 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 33 [2018-01-20 23:54:24,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:24,019 INFO L225 Difference]: With dead ends: 44 [2018-01-20 23:54:24,019 INFO L226 Difference]: Without dead ends: 35 [2018-01-20 23:54:24,020 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1123 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1003, Invalid=1859, Unknown=0, NotChecked=0, Total=2862 [2018-01-20 23:54:24,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-01-20 23:54:24,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-01-20 23:54:24,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-01-20 23:54:24,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-01-20 23:54:24,022 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-01-20 23:54:24,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:24,023 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-01-20 23:54:24,023 INFO L433 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-01-20 23:54:24,023 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-01-20 23:54:24,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-20 23:54:24,023 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:24,023 INFO L322 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:24,023 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:24,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1935590064, now seen corresponding path program 16 times [2018-01-20 23:54:24,024 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:24,024 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:24,024 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:24,024 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:24,024 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:24,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:24,032 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:24,198 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,198 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:24,198 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:24,199 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:24,199 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:24,199 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:24,199 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:24,204 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:24,204 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:24,215 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:24,217 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:24,334 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,334 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:24,791 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,810 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:24,811 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 33 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 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:24,813 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:24,814 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:24,843 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:24,846 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:24,850 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,850 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:24,969 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,971 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:24,971 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 56 [2018-01-20 23:54:24,972 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:24,972 INFO L409 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-01-20 23:54:24,972 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-01-20 23:54:24,973 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1077, Invalid=2003, Unknown=0, NotChecked=0, Total=3080 [2018-01-20 23:54:24,973 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 38 states. [2018-01-20 23:54:25,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:25,042 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-01-20 23:54:25,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-20 23:54:25,042 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 34 [2018-01-20 23:54:25,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:25,043 INFO L225 Difference]: With dead ends: 45 [2018-01-20 23:54:25,043 INFO L226 Difference]: Without dead ends: 36 [2018-01-20 23:54:25,044 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1116, Invalid=2076, Unknown=0, NotChecked=0, Total=3192 [2018-01-20 23:54:25,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-20 23:54:25,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-20 23:54:25,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-20 23:54:25,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-01-20 23:54:25,048 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-01-20 23:54:25,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:25,048 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-01-20 23:54:25,048 INFO L433 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-01-20 23:54:25,049 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-01-20 23:54:25,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-20 23:54:25,049 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:25,049 INFO L322 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:25,050 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:25,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1276432011, now seen corresponding path program 17 times [2018-01-20 23:54:25,050 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:25,051 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:25,051 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:25,051 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:25,051 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:25,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:25,058 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:25,269 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:25,269 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:25,269 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:25,269 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:25,269 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:25,269 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:25,269 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:25,274 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:25,274 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:25,278 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,278 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,279 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,280 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,281 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,281 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,282 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,283 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,284 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,288 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,289 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:25,290 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:25,418 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:25,418 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:25,969 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:25,989 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:25,989 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 35 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 35 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:25,992 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:25,992 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:25,996 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,997 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,000 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,004 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,008 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,012 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,017 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,022 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,028 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,039 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,047 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:26,051 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:26,058 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:26,058 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:26,203 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:26,204 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:26,205 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 59 [2018-01-20 23:54:26,205 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:26,205 INFO L409 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-01-20 23:54:26,205 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-01-20 23:54:26,206 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2228, Unknown=0, NotChecked=0, Total=3422 [2018-01-20 23:54:26,207 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 40 states. [2018-01-20 23:54:26,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:26,252 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-01-20 23:54:26,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-20 23:54:26,253 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 35 [2018-01-20 23:54:26,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:26,253 INFO L225 Difference]: With dead ends: 46 [2018-01-20 23:54:26,253 INFO L226 Difference]: Without dead ends: 37 [2018-01-20 23:54:26,254 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1235, Invalid=2305, Unknown=0, NotChecked=0, Total=3540 [2018-01-20 23:54:26,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-20 23:54:26,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-20 23:54:26,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-20 23:54:26,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-01-20 23:54:26,257 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-01-20 23:54:26,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:26,257 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-01-20 23:54:26,257 INFO L433 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-01-20 23:54:26,257 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-01-20 23:54:26,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-20 23:54:26,257 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:26,257 INFO L322 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:26,258 INFO L371 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:26,258 INFO L82 PathProgramCache]: Analyzing trace with hash 2064868528, now seen corresponding path program 18 times [2018-01-20 23:54:26,258 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:26,258 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:26,258 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:26,258 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:26,258 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:26,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:26,266 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:26,483 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:26,483 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:26,483 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:26,483 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:26,483 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:26,483 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:26,483 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:26,488 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:26,488 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:26,496 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,497 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,498 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,499 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,500 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,501 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,502 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,503 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,505 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,506 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:26,506 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:26,507 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:26,648 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:26,648 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:27,192 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:27,212 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:27,212 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 37 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 37 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:27,215 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:27,215 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:27,224 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,231 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,239 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,247 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,255 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,265 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,274 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,284 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,294 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,305 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:27,313 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:27,316 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:27,321 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:27,321 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:27,446 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:27,447 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:27,447 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 62 [2018-01-20 23:54:27,447 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:27,447 INFO L409 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-01-20 23:54:27,447 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-01-20 23:54:27,448 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1317, Invalid=2465, Unknown=0, NotChecked=0, Total=3782 [2018-01-20 23:54:27,448 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 42 states. [2018-01-20 23:54:27,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:27,502 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-01-20 23:54:27,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-20 23:54:27,502 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 36 [2018-01-20 23:54:27,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:27,503 INFO L225 Difference]: With dead ends: 47 [2018-01-20 23:54:27,503 INFO L226 Difference]: Without dead ends: 38 [2018-01-20 23:54:27,504 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1360, Invalid=2546, Unknown=0, NotChecked=0, Total=3906 [2018-01-20 23:54:27,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-01-20 23:54:27,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-01-20 23:54:27,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-20 23:54:27,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-01-20 23:54:27,506 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-01-20 23:54:27,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:27,507 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-01-20 23:54:27,507 INFO L433 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-01-20 23:54:27,507 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-01-20 23:54:27,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-20 23:54:27,507 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:27,507 INFO L322 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:27,507 INFO L371 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:27,507 INFO L82 PathProgramCache]: Analyzing trace with hash 736596779, now seen corresponding path program 19 times [2018-01-20 23:54:27,508 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:27,508 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:27,508 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:27,508 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:27,508 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:27,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:27,517 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:27,741 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:27,741 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:27,741 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:27,741 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:27,742 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:27,742 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:27,742 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:27,746 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:27,747 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:27,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:27,759 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:27,920 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:27,920 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:28,498 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:28,518 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:28,518 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 39 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 39 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:28,521 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:28,521 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:28,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:28,556 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:28,562 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:28,562 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:28,700 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:28,701 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:28,701 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 65 [2018-01-20 23:54:28,702 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:28,702 INFO L409 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-01-20 23:54:28,702 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-01-20 23:54:28,703 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1446, Invalid=2714, Unknown=0, NotChecked=0, Total=4160 [2018-01-20 23:54:28,703 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 44 states. [2018-01-20 23:54:28,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:28,745 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-01-20 23:54:28,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-20 23:54:28,746 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 37 [2018-01-20 23:54:28,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:28,746 INFO L225 Difference]: With dead ends: 48 [2018-01-20 23:54:28,746 INFO L226 Difference]: Without dead ends: 39 [2018-01-20 23:54:28,747 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1491, Invalid=2799, Unknown=0, NotChecked=0, Total=4290 [2018-01-20 23:54:28,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-20 23:54:28,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-20 23:54:28,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-20 23:54:28,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-01-20 23:54:28,750 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-01-20 23:54:28,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:28,750 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-01-20 23:54:28,750 INFO L433 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-01-20 23:54:28,750 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-01-20 23:54:28,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-01-20 23:54:28,750 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:28,751 INFO L322 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:28,751 INFO L371 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:28,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1785121776, now seen corresponding path program 20 times [2018-01-20 23:54:28,751 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:28,751 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:28,752 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:28,752 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:28,752 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:28,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:28,758 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:28,978 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:28,978 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:28,978 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:28,978 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:28,978 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:28,978 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:28,978 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:28,983 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:28,983 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:28,990 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:28,994 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:28,995 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:28,997 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:29,164 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:29,164 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:29,824 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:29,844 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:29,844 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 41 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 41 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:29,847 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:29,847 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:29,856 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:29,868 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:29,878 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:29,881 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:29,886 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:29,886 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:30,038 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:30,039 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:30,039 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 68 [2018-01-20 23:54:30,039 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:30,039 INFO L409 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-01-20 23:54:30,040 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-01-20 23:54:30,040 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1581, Invalid=2975, Unknown=0, NotChecked=0, Total=4556 [2018-01-20 23:54:30,040 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 46 states. [2018-01-20 23:54:30,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:30,096 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-01-20 23:54:30,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-20 23:54:30,096 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 38 [2018-01-20 23:54:30,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:30,097 INFO L225 Difference]: With dead ends: 49 [2018-01-20 23:54:30,097 INFO L226 Difference]: Without dead ends: 40 [2018-01-20 23:54:30,097 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1898 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1628, Invalid=3064, Unknown=0, NotChecked=0, Total=4692 [2018-01-20 23:54:30,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-20 23:54:30,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-20 23:54:30,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-20 23:54:30,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-01-20 23:54:30,100 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-01-20 23:54:30,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:30,101 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-01-20 23:54:30,101 INFO L433 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-01-20 23:54:30,101 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-01-20 23:54:30,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-20 23:54:30,101 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:30,101 INFO L322 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:30,101 INFO L371 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:30,102 INFO L82 PathProgramCache]: Analyzing trace with hash 1645981643, now seen corresponding path program 21 times [2018-01-20 23:54:30,102 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:30,102 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:30,103 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:30,103 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:30,103 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:30,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:30,109 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:30,445 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:30,445 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:30,445 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:30,445 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:30,445 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:30,445 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:30,445 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:30,450 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:30,450 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:30,457 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,458 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,459 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,460 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,461 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,462 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,463 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,464 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,465 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,466 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,467 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,468 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:30,469 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:30,470 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:30,649 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:30,649 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:31,335 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:31,355 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:31,355 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 43 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 43 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:31,358 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:31,358 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:31,367 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,374 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,381 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,389 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,398 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,407 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,416 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,426 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,436 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,447 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,458 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,469 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:31,478 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:31,481 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:31,486 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:31,486 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:31,638 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:31,640 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:31,640 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 71 [2018-01-20 23:54:31,640 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:31,640 INFO L409 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-01-20 23:54:31,641 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-01-20 23:54:31,641 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1722, Invalid=3248, Unknown=0, NotChecked=0, Total=4970 [2018-01-20 23:54:31,641 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 48 states. [2018-01-20 23:54:31,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:31,703 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-01-20 23:54:31,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-20 23:54:31,704 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 39 [2018-01-20 23:54:31,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:31,704 INFO L225 Difference]: With dead ends: 50 [2018-01-20 23:54:31,704 INFO L226 Difference]: Without dead ends: 41 [2018-01-20 23:54:31,705 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1771, Invalid=3341, Unknown=0, NotChecked=0, Total=5112 [2018-01-20 23:54:31,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-01-20 23:54:31,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-01-20 23:54:31,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-20 23:54:31,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-01-20 23:54:31,707 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-01-20 23:54:31,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:31,708 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-01-20 23:54:31,708 INFO L433 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-01-20 23:54:31,708 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-01-20 23:54:31,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-01-20 23:54:31,708 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:31,709 INFO L322 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:31,709 INFO L371 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:31,709 INFO L82 PathProgramCache]: Analyzing trace with hash 636005232, now seen corresponding path program 22 times [2018-01-20 23:54:31,709 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:31,709 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:31,709 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:31,709 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:31,710 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:31,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:31,718 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:31,953 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:31,954 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:31,954 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:31,954 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:31,954 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:31,954 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:31,954 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:31,959 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:31,959 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:31,972 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:31,973 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:32,165 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:32,165 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:32,929 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:32,948 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:32,949 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 45 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 45 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:32,951 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:32,952 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:32,985 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:32,988 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:32,993 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:32,993 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:33,158 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:33,159 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:33,160 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 74 [2018-01-20 23:54:33,160 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:33,160 INFO L409 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-01-20 23:54:33,160 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-01-20 23:54:33,160 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1869, Invalid=3533, Unknown=0, NotChecked=0, Total=5402 [2018-01-20 23:54:33,161 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 50 states. [2018-01-20 23:54:33,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:33,216 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-01-20 23:54:33,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-20 23:54:33,216 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 40 [2018-01-20 23:54:33,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:33,216 INFO L225 Difference]: With dead ends: 51 [2018-01-20 23:54:33,217 INFO L226 Difference]: Without dead ends: 42 [2018-01-20 23:54:33,217 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1920, Invalid=3630, Unknown=0, NotChecked=0, Total=5550 [2018-01-20 23:54:33,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-01-20 23:54:33,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-01-20 23:54:33,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-01-20 23:54:33,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-01-20 23:54:33,220 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-01-20 23:54:33,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:33,220 INFO L432 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-01-20 23:54:33,220 INFO L433 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-01-20 23:54:33,220 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-01-20 23:54:33,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-20 23:54:33,221 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:33,221 INFO L322 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:33,221 INFO L371 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:33,221 INFO L82 PathProgramCache]: Analyzing trace with hash -608492437, now seen corresponding path program 23 times [2018-01-20 23:54:33,221 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:33,221 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:33,222 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:33,222 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:33,222 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:33,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:33,230 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:33,547 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:33,547 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:33,548 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:33,548 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:33,548 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:33,548 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:33,548 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:33,553 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:33,553 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:33,557 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,558 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,558 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,559 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,560 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,561 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,561 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,562 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,563 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,564 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,565 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,566 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,570 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:33,572 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:33,574 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:33,780 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:33,781 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:34,566 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:34,586 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:34,586 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 47 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 47 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:34,589 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:34,589 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:34,593 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,595 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,598 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,601 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,605 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,609 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,614 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,619 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,624 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,630 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,637 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,643 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,656 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:34,666 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:34,669 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:34,678 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:34,678 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:34,896 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:34,897 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:34,897 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 77 [2018-01-20 23:54:34,897 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:34,897 INFO L409 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-01-20 23:54:34,898 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-01-20 23:54:34,898 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2022, Invalid=3830, Unknown=0, NotChecked=0, Total=5852 [2018-01-20 23:54:34,898 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 52 states. [2018-01-20 23:54:34,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:34,978 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-01-20 23:54:34,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-20 23:54:34,978 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 41 [2018-01-20 23:54:34,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:34,979 INFO L225 Difference]: With dead ends: 52 [2018-01-20 23:54:34,979 INFO L226 Difference]: Without dead ends: 43 [2018-01-20 23:54:34,979 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2459 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2075, Invalid=3931, Unknown=0, NotChecked=0, Total=6006 [2018-01-20 23:54:34,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-20 23:54:34,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-20 23:54:34,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-20 23:54:34,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-01-20 23:54:34,982 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-01-20 23:54:34,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:34,982 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-01-20 23:54:34,982 INFO L433 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-01-20 23:54:34,982 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-01-20 23:54:34,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-20 23:54:34,982 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:34,983 INFO L322 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:34,983 INFO L371 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:34,983 INFO L82 PathProgramCache]: Analyzing trace with hash -533214512, now seen corresponding path program 24 times [2018-01-20 23:54:34,983 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:34,983 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:34,983 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:34,984 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:34,984 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:34,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:34,991 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:35,248 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:35,248 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:35,248 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:35,248 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:35,248 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:35,249 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:35,249 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:35,254 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:35,254 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:35,260 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,262 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,263 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,265 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,266 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,267 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,268 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,269 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,270 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,271 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,272 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,273 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,274 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:35,275 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:35,277 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:35,516 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:35,516 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:36,369 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:36,389 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:36,389 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 49 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 49 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:36,392 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:36,392 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:36,402 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,409 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,417 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,425 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,433 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,442 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,452 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,462 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,473 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,484 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,495 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,507 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,519 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:36,528 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:36,532 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:36,537 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:36,537 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:36,720 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:36,721 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:36,721 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 80 [2018-01-20 23:54:36,721 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:36,722 INFO L409 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-01-20 23:54:36,722 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-01-20 23:54:36,723 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2181, Invalid=4139, Unknown=0, NotChecked=0, Total=6320 [2018-01-20 23:54:36,723 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 54 states. [2018-01-20 23:54:36,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:36,821 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-01-20 23:54:36,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-20 23:54:36,821 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 42 [2018-01-20 23:54:36,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:36,822 INFO L225 Difference]: With dead ends: 53 [2018-01-20 23:54:36,822 INFO L226 Difference]: Without dead ends: 44 [2018-01-20 23:54:36,823 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2662 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2236, Invalid=4244, Unknown=0, NotChecked=0, Total=6480 [2018-01-20 23:54:36,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-01-20 23:54:36,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-01-20 23:54:36,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-20 23:54:36,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-01-20 23:54:36,827 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-01-20 23:54:36,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:36,827 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-01-20 23:54:36,827 INFO L433 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-01-20 23:54:36,827 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-01-20 23:54:36,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-01-20 23:54:36,828 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:36,828 INFO L322 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:36,828 INFO L371 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:36,828 INFO L82 PathProgramCache]: Analyzing trace with hash 1800401163, now seen corresponding path program 25 times [2018-01-20 23:54:36,828 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:36,829 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:36,829 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:36,829 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:36,829 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:36,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:36,840 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:37,130 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:37,130 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:37,130 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:37,130 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:37,130 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:37,130 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:37,130 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:37,135 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:37,135 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:37,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:37,149 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:37,400 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:37,400 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:38,318 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:38,338 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:38,338 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 51 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 51 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:38,340 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:38,340 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:38,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:38,370 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:38,375 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:38,376 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:38,566 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:38,567 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:38,567 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 83 [2018-01-20 23:54:38,567 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:38,567 INFO L409 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-01-20 23:54:38,568 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-01-20 23:54:38,568 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=4460, Unknown=0, NotChecked=0, Total=6806 [2018-01-20 23:54:38,568 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 56 states. [2018-01-20 23:54:38,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:38,625 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-01-20 23:54:38,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-20 23:54:38,626 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 43 [2018-01-20 23:54:38,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:38,626 INFO L225 Difference]: With dead ends: 54 [2018-01-20 23:54:38,626 INFO L226 Difference]: Without dead ends: 45 [2018-01-20 23:54:38,627 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2873 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2403, Invalid=4569, Unknown=0, NotChecked=0, Total=6972 [2018-01-20 23:54:38,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-01-20 23:54:38,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-01-20 23:54:38,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-01-20 23:54:38,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-01-20 23:54:38,629 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-01-20 23:54:38,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:38,629 INFO L432 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-01-20 23:54:38,629 INFO L433 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-01-20 23:54:38,629 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-01-20 23:54:38,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-20 23:54:38,630 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:38,630 INFO L322 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:38,630 INFO L371 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:38,630 INFO L82 PathProgramCache]: Analyzing trace with hash 1128043056, now seen corresponding path program 26 times [2018-01-20 23:54:38,630 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:38,630 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:38,630 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:38,631 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:38,631 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:38,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:38,640 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:38,938 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:38,938 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:38,938 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:38,938 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:38,938 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:38,939 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:38,939 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:38,943 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:38,944 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:38,950 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:38,956 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:38,957 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:38,958 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:39,208 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:39,208 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:40,180 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:40,199 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:40,199 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 53 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 53 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:40,202 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:40,202 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:40,212 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:40,226 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:40,237 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:40,241 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:40,247 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:40,247 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:40,458 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:40,460 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:40,460 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 86 [2018-01-20 23:54:40,460 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:40,460 INFO L409 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-01-20 23:54:40,460 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-01-20 23:54:40,461 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2517, Invalid=4793, Unknown=0, NotChecked=0, Total=7310 [2018-01-20 23:54:40,461 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 58 states. [2018-01-20 23:54:40,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:40,519 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-01-20 23:54:40,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-01-20 23:54:40,519 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 44 [2018-01-20 23:54:40,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:40,520 INFO L225 Difference]: With dead ends: 55 [2018-01-20 23:54:40,520 INFO L226 Difference]: Without dead ends: 46 [2018-01-20 23:54:40,520 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3092 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2576, Invalid=4906, Unknown=0, NotChecked=0, Total=7482 [2018-01-20 23:54:40,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-20 23:54:40,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-01-20 23:54:40,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-20 23:54:40,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-01-20 23:54:40,523 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-01-20 23:54:40,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:40,524 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-01-20 23:54:40,524 INFO L433 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-01-20 23:54:40,524 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-01-20 23:54:40,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-01-20 23:54:40,524 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:40,524 INFO L322 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:40,524 INFO L371 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:40,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1759778219, now seen corresponding path program 27 times [2018-01-20 23:54:40,524 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:40,525 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:40,525 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:40,525 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:40,525 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:40,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:40,532 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:40,955 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:40,955 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:40,955 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:40,955 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:40,955 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:40,955 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:40,955 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:40,960 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:40,960 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:40,967 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,969 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,970 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,971 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,973 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,974 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,975 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,976 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,978 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,979 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,980 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,981 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,982 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,983 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,984 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:40,985 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:40,986 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:41,262 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:41,263 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:42,314 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:42,334 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:42,334 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 55 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 55 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:42,337 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:42,337 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:42,347 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,354 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,362 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,370 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,379 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,388 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,397 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,407 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,417 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,429 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,440 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,451 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,463 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,476 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,489 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:42,498 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:42,502 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:42,510 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:42,510 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:42,732 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:42,733 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:42,733 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 89 [2018-01-20 23:54:42,733 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:42,734 INFO L409 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-01-20 23:54:42,734 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-01-20 23:54:42,734 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2694, Invalid=5138, Unknown=0, NotChecked=0, Total=7832 [2018-01-20 23:54:42,734 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 60 states. [2018-01-20 23:54:42,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:42,789 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-01-20 23:54:42,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-20 23:54:42,789 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 45 [2018-01-20 23:54:42,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:42,789 INFO L225 Difference]: With dead ends: 56 [2018-01-20 23:54:42,790 INFO L226 Difference]: Without dead ends: 47 [2018-01-20 23:54:42,790 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3319 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2755, Invalid=5255, Unknown=0, NotChecked=0, Total=8010 [2018-01-20 23:54:42,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-01-20 23:54:42,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-01-20 23:54:42,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-20 23:54:42,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-01-20 23:54:42,792 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-01-20 23:54:42,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:42,792 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-01-20 23:54:42,792 INFO L433 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-01-20 23:54:42,792 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-01-20 23:54:42,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-20 23:54:42,793 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:42,793 INFO L322 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:42,793 INFO L371 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:42,793 INFO L82 PathProgramCache]: Analyzing trace with hash -131268208, now seen corresponding path program 28 times [2018-01-20 23:54:42,793 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:42,794 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:42,794 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:42,794 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:42,794 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:42,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:42,804 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:43,205 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:43,205 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:43,205 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:43,205 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:43,206 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:43,206 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:43,206 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:43,212 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:43,212 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:43,230 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:43,232 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:43,563 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:43,563 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:44,674 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:44,694 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:44,694 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 57 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 57 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:44,697 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:44,697 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:44,737 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:44,741 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:44,747 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:44,747 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:44,968 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:44,969 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:44,969 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 92 [2018-01-20 23:54:44,969 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:44,970 INFO L409 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-01-20 23:54:44,970 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-01-20 23:54:44,970 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2877, Invalid=5495, Unknown=0, NotChecked=0, Total=8372 [2018-01-20 23:54:44,970 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 62 states. [2018-01-20 23:54:45,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:45,032 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-01-20 23:54:45,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-20 23:54:45,032 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 46 [2018-01-20 23:54:45,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:45,032 INFO L225 Difference]: With dead ends: 57 [2018-01-20 23:54:45,032 INFO L226 Difference]: Without dead ends: 48 [2018-01-20 23:54:45,033 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3554 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2940, Invalid=5616, Unknown=0, NotChecked=0, Total=8556 [2018-01-20 23:54:45,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-01-20 23:54:45,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-01-20 23:54:45,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-20 23:54:45,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-01-20 23:54:45,036 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-01-20 23:54:45,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:45,036 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-01-20 23:54:45,037 INFO L433 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-01-20 23:54:45,037 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-01-20 23:54:45,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-20 23:54:45,037 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:45,037 INFO L322 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:45,037 INFO L371 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:45,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1375834699, now seen corresponding path program 29 times [2018-01-20 23:54:45,037 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:45,038 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:45,038 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:45,038 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:45,038 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:45,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:45,046 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:45,459 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:45,460 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:45,460 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:45,460 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:45,460 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:45,460 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:45,460 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:45,465 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:45,465 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:45,469 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,470 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,471 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,471 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,472 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,473 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,474 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,474 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,475 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,476 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,477 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,478 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,479 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,479 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,480 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,484 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:45,485 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:45,487 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:45,795 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:45,796 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:46,973 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:46,993 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:46,994 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 59 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 59 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:46,997 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:46,997 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:47,002 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,003 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,007 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,011 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,015 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,020 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,025 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,031 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,037 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,043 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,050 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,057 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,065 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,073 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,081 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,096 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:47,107 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:47,111 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:47,117 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:47,118 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:47,353 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:47,354 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:47,354 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 95 [2018-01-20 23:54:47,354 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:47,355 INFO L409 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-01-20 23:54:47,355 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-01-20 23:54:47,355 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3066, Invalid=5864, Unknown=0, NotChecked=0, Total=8930 [2018-01-20 23:54:47,355 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 64 states. [2018-01-20 23:54:47,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:47,424 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-01-20 23:54:47,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-20 23:54:47,424 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 47 [2018-01-20 23:54:47,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:47,425 INFO L225 Difference]: With dead ends: 58 [2018-01-20 23:54:47,425 INFO L226 Difference]: Without dead ends: 49 [2018-01-20 23:54:47,426 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 124 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3797 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3131, Invalid=5989, Unknown=0, NotChecked=0, Total=9120 [2018-01-20 23:54:47,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-20 23:54:47,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-01-20 23:54:47,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-01-20 23:54:47,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-01-20 23:54:47,429 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-01-20 23:54:47,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:47,429 INFO L432 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-01-20 23:54:47,429 INFO L433 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-01-20 23:54:47,429 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-01-20 23:54:47,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-01-20 23:54:47,429 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:47,429 INFO L322 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:47,429 INFO L371 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:47,430 INFO L82 PathProgramCache]: Analyzing trace with hash 851384560, now seen corresponding path program 30 times [2018-01-20 23:54:47,430 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:47,430 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:47,430 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:47,430 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:47,430 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:47,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:47,439 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:47,810 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:47,810 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:47,810 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:47,810 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:47,811 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:47,811 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:47,811 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:47,815 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:47,815 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:47,822 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,824 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,825 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,826 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,827 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,828 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,829 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,830 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,831 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,832 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,833 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,834 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,835 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,836 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,838 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,839 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:47,839 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:47,841 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:48,161 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:48,162 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:49,438 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:49,458 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:49,458 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 61 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 61 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:49,461 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:49,461 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:49,471 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,478 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,486 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,494 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,502 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,512 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,521 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,531 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,541 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,552 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,563 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,574 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,586 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,599 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,611 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,625 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:49,635 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:49,638 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:49,645 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:49,645 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:49,926 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:49,927 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:49,927 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 98 [2018-01-20 23:54:49,928 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:49,928 INFO L409 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-01-20 23:54:49,928 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-01-20 23:54:49,928 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3261, Invalid=6245, Unknown=0, NotChecked=0, Total=9506 [2018-01-20 23:54:49,928 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 66 states. [2018-01-20 23:54:50,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:50,015 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-01-20 23:54:50,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-01-20 23:54:50,015 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 48 [2018-01-20 23:54:50,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:50,016 INFO L225 Difference]: With dead ends: 59 [2018-01-20 23:54:50,016 INFO L226 Difference]: Without dead ends: 50 [2018-01-20 23:54:50,016 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4048 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3328, Invalid=6374, Unknown=0, NotChecked=0, Total=9702 [2018-01-20 23:54:50,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-20 23:54:50,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-01-20 23:54:50,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-20 23:54:50,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-01-20 23:54:50,018 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-01-20 23:54:50,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:50,018 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-01-20 23:54:50,018 INFO L433 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-01-20 23:54:50,018 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-01-20 23:54:50,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-20 23:54:50,019 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:50,019 INFO L322 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:50,019 INFO L371 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:50,019 INFO L82 PathProgramCache]: Analyzing trace with hash 1773299435, now seen corresponding path program 31 times [2018-01-20 23:54:50,019 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:50,020 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:50,020 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:50,020 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:50,020 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:50,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:50,028 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:50,677 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:50,678 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:50,678 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:50,678 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:50,678 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:50,678 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:50,678 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:50,683 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:50,683 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:50,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:50,698 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:51,033 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:51,033 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:52,354 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:52,373 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:52,374 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 63 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 63 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:52,376 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:52,377 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:52,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:52,409 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:52,416 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:52,416 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:52,676 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:52,677 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:52,678 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 101 [2018-01-20 23:54:52,678 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:52,678 INFO L409 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-01-20 23:54:52,678 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-01-20 23:54:52,679 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3462, Invalid=6638, Unknown=0, NotChecked=0, Total=10100 [2018-01-20 23:54:52,679 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 68 states. [2018-01-20 23:54:52,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:52,740 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-01-20 23:54:52,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-20 23:54:52,740 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 49 [2018-01-20 23:54:52,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:52,740 INFO L225 Difference]: With dead ends: 60 [2018-01-20 23:54:52,740 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:54:52,741 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4307 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3531, Invalid=6771, Unknown=0, NotChecked=0, Total=10302 [2018-01-20 23:54:52,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:54:52,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-01-20 23:54:52,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-01-20 23:54:52,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-01-20 23:54:52,743 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-01-20 23:54:52,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:52,743 INFO L432 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-01-20 23:54:52,743 INFO L433 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-01-20 23:54:52,743 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-01-20 23:54:52,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-01-20 23:54:52,744 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:52,744 INFO L322 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:52,744 INFO L371 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:52,744 INFO L82 PathProgramCache]: Analyzing trace with hash 287889488, now seen corresponding path program 32 times [2018-01-20 23:54:52,744 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:52,745 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:52,745 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:52,745 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:52,745 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:52,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:52,758 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:53,234 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:53,234 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:53,235 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:53,235 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:53,235 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:53,235 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:53,235 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:53,240 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:53,240 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:53,247 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:53,253 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:53,255 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:53,256 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:53,604 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:53,604 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:55,002 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:55,021 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:55,022 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 65 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 65 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:55,025 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:55,025 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:55,035 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:55,051 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:55,064 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:55,068 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:55,074 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:55,075 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:55,348 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:55,349 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:55,349 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 104 [2018-01-20 23:54:55,349 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:55,349 INFO L409 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-01-20 23:54:55,350 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-01-20 23:54:55,350 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3669, Invalid=7043, Unknown=0, NotChecked=0, Total=10712 [2018-01-20 23:54:55,350 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 70 states. [2018-01-20 23:54:55,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:55,485 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-01-20 23:54:55,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-01-20 23:54:55,485 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 50 [2018-01-20 23:54:55,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:55,486 INFO L225 Difference]: With dead ends: 61 [2018-01-20 23:54:55,486 INFO L226 Difference]: Without dead ends: 52 [2018-01-20 23:54:55,487 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 130 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4574 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3740, Invalid=7180, Unknown=0, NotChecked=0, Total=10920 [2018-01-20 23:54:55,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-01-20 23:54:55,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-01-20 23:54:55,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-20 23:54:55,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-01-20 23:54:55,490 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-01-20 23:54:55,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:55,491 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-01-20 23:54:55,491 INFO L433 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-01-20 23:54:55,491 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-01-20 23:54:55,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-01-20 23:54:55,491 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:55,492 INFO L322 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:55,492 INFO L371 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:55,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1484821387, now seen corresponding path program 33 times [2018-01-20 23:54:55,492 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:55,493 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:55,493 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:55,493 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:55,493 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:55,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:55,505 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:55,994 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:55,994 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:55,994 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:55,994 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:55,994 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:55,994 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:55,994 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:55,999 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:55,999 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:56,006 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,007 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,008 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,009 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,010 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,011 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,012 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,013 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,014 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,015 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,017 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,018 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,019 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,020 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,021 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,022 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,023 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,024 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:56,025 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:56,032 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:56,409 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:56,409 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:57,887 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:57,906 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:57,906 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 67 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 67 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:57,909 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:57,910 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:57,920 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:57,927 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:57,934 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:57,942 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:57,951 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:57,960 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:57,969 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:57,979 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:57,989 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:57,999 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:58,010 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:58,022 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:58,034 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:58,046 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:58,059 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:58,073 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:58,086 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:58,100 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:58,111 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:58,115 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:58,121 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:58,121 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:58,402 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:58,403 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:58,403 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 107 [2018-01-20 23:54:58,403 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:58,404 INFO L409 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-01-20 23:54:58,404 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-01-20 23:54:58,404 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3882, Invalid=7460, Unknown=0, NotChecked=0, Total=11342 [2018-01-20 23:54:58,404 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 72 states. [2018-01-20 23:54:58,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:58,498 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-01-20 23:54:58,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-01-20 23:54:58,498 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 51 [2018-01-20 23:54:58,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:58,499 INFO L225 Difference]: With dead ends: 62 [2018-01-20 23:54:58,499 INFO L226 Difference]: Without dead ends: 53 [2018-01-20 23:54:58,500 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4849 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3955, Invalid=7601, Unknown=0, NotChecked=0, Total=11556 [2018-01-20 23:54:58,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-01-20 23:54:58,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-01-20 23:54:58,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-20 23:54:58,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-01-20 23:54:58,503 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-01-20 23:54:58,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:58,503 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-01-20 23:54:58,503 INFO L433 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-01-20 23:54:58,503 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-01-20 23:54:58,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-20 23:54:58,504 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:58,504 INFO L322 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:58,504 INFO L371 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:58,504 INFO L82 PathProgramCache]: Analyzing trace with hash -64995408, now seen corresponding path program 34 times [2018-01-20 23:54:58,504 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:58,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:58,505 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:58,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:58,505 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:58,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:58,518 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:59,058 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:59,059 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:59,059 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:59,059 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:59,059 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:59,059 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:59,059 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:59,064 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:59,064 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:59,080 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:59,081 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:59,479 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:59,479 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:55:01,041 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:01,060 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:01,060 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 69 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 69 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:55:01,063 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:55:01,063 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:55:01,106 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:55:01,110 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:55:01,117 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:01,117 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:55:01,412 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:01,413 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:55:01,414 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 110 [2018-01-20 23:55:01,414 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:55:01,414 INFO L409 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-01-20 23:55:01,414 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-01-20 23:55:01,414 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=4101, Invalid=7889, Unknown=0, NotChecked=0, Total=11990 [2018-01-20 23:55:01,415 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 74 states. [2018-01-20 23:55:01,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:55:01,469 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-01-20 23:55:01,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-20 23:55:01,469 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 52 [2018-01-20 23:55:01,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:55:01,469 INFO L225 Difference]: With dead ends: 63 [2018-01-20 23:55:01,469 INFO L226 Difference]: Without dead ends: 54 [2018-01-20 23:55:01,470 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5132 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4176, Invalid=8034, Unknown=0, NotChecked=0, Total=12210 [2018-01-20 23:55:01,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-01-20 23:55:01,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-01-20 23:55:01,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-01-20 23:55:01,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-01-20 23:55:01,472 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-01-20 23:55:01,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:55:01,473 INFO L432 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-01-20 23:55:01,473 INFO L433 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-01-20 23:55:01,473 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-01-20 23:55:01,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-01-20 23:55:01,473 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:55:01,473 INFO L322 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:55:01,473 INFO L371 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:55:01,474 INFO L82 PathProgramCache]: Analyzing trace with hash -864675797, now seen corresponding path program 35 times [2018-01-20 23:55:01,474 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:55:01,474 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:55:01,474 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:55:01,474 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:55:01,475 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:55:01,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:55:01,483 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:55:02,312 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:02,312 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:02,312 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:55:02,312 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:55:02,312 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:55:02,312 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:02,313 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:55:02,317 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:55:02,318 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:55:02,323 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,336 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,338 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,338 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,339 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,340 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,341 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,342 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,343 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,345 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,346 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,347 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,348 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,349 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,351 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,352 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,353 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,355 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,359 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:02,361 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:55:02,364 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:55:02,790 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:02,790 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:55:04,465 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:04,485 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:04,485 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 71 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 71 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:55:04,488 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:55:04,488 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:55:04,493 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,494 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,497 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,501 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,505 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,509 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,513 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,519 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,529 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,537 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,544 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,551 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,559 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,567 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,575 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,583 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,592 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,602 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,618 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:55:04,638 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:55:04,642 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:55:04,652 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:04,652 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:55:04,979 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:04,980 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:55:04,980 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 113 [2018-01-20 23:55:04,980 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:55:04,981 INFO L409 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-01-20 23:55:04,981 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-01-20 23:55:04,981 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=4326, Invalid=8330, Unknown=0, NotChecked=0, Total=12656 [2018-01-20 23:55:04,982 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 76 states. [2018-01-20 23:55:05,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:55:05,056 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-01-20 23:55:05,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-01-20 23:55:05,056 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 53 [2018-01-20 23:55:05,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:55:05,056 INFO L225 Difference]: With dead ends: 64 [2018-01-20 23:55:05,056 INFO L226 Difference]: Without dead ends: 55 [2018-01-20 23:55:05,057 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 136 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5423 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=4403, Invalid=8479, Unknown=0, NotChecked=0, Total=12882 [2018-01-20 23:55:05,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-20 23:55:05,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-01-20 23:55:05,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-20 23:55:05,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-01-20 23:55:05,059 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2018-01-20 23:55:05,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:55:05,060 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-01-20 23:55:05,060 INFO L433 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-01-20 23:55:05,060 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-01-20 23:55:05,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-01-20 23:55:05,060 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:55:05,060 INFO L322 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:55:05,060 INFO L371 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:55:05,060 INFO L82 PathProgramCache]: Analyzing trace with hash 115035920, now seen corresponding path program 36 times [2018-01-20 23:55:05,060 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:55:05,061 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:55:05,061 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:55:05,061 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:55:05,061 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:55:05,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:55:05,071 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:55:05,572 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:05,572 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:05,572 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:55:05,572 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:55:05,572 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:55:05,572 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:05,572 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:55:05,577 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:55:05,577 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:55:05,584 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,586 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,587 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,588 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,589 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,590 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,591 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,592 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,593 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,594 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,595 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,596 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,597 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,599 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,600 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,601 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,602 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,603 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,604 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:05,605 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:55:05,606 INFO L270 TraceCheckSpWp]: Computing forward predicates... Received shutdown request... [2018-01-20 23:55:05,658 INFO L175 TraceCheckSpWp]: Timeout while computing interpolants [2018-01-20 23:55:05,658 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-20 23:55:05,660 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:55:05,660 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:55:05,660 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:55:05,660 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:55:05,660 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:55:05,660 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:55:05,660 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:55:05,660 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-20 23:55:05,660 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:55:05,661 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-20 23:55:05,661 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-20 23:55:05,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.01 11:55:05 BoogieIcfgContainer [2018-01-20 23:55:05,662 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-01-20 23:55:05,663 INFO L168 Benchmark]: Toolchain (without parser) took 54308.76 ms. Allocated memory was 302.0 MB in the beginning and 847.2 MB in the end (delta: 545.3 MB). Free memory was 261.3 MB in the beginning and 357.6 MB in the end (delta: -96.3 MB). Peak memory consumption was 449.0 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,663 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 302.0 MB. Free memory is still 266.3 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-20 23:55:05,663 INFO L168 Benchmark]: CACSL2BoogieTranslator took 186.64 ms. Allocated memory is still 302.0 MB. Free memory was 260.3 MB in the beginning and 253.2 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,664 INFO L168 Benchmark]: Boogie Preprocessor took 33.82 ms. Allocated memory is still 302.0 MB. Free memory was 253.2 MB in the beginning and 251.2 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,664 INFO L168 Benchmark]: RCFGBuilder took 182.91 ms. Allocated memory is still 302.0 MB. Free memory was 251.2 MB in the beginning and 239.6 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,664 INFO L168 Benchmark]: TraceAbstraction took 53897.77 ms. Allocated memory was 302.0 MB in the beginning and 847.2 MB in the end (delta: 545.3 MB). Free memory was 238.6 MB in the beginning and 357.6 MB in the end (delta: -119.0 MB). Peak memory consumption was 426.3 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,666 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 302.0 MB. Free memory is still 266.3 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 186.64 ms. Allocated memory is still 302.0 MB. Free memory was 260.3 MB in the beginning and 253.2 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 33.82 ms. Allocated memory is still 302.0 MB. Free memory was 253.2 MB in the beginning and 251.2 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 182.91 ms. Allocated memory is still 302.0 MB. Free memory was 251.2 MB in the beginning and 239.6 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. * TraceAbstraction took 53897.77 ms. Allocated memory was 302.0 MB in the beginning and 847.2 MB in the end (delta: 545.3 MB). Free memory was 238.6 MB in the beginning and 357.6 MB in the end (delta: -119.0 MB). Peak memory consumption was 426.3 MB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 18 LocStat_MAX_WEQGRAPH_SIZE : 2 LocStat_MAX_SIZEOF_WEQEDGELABEL : 1 LocStat_NO_SUPPORTING_EQUALITIES : 126 LocStat_NO_SUPPORTING_DISEQUALITIES : 29 LocStat_NO_DISJUNCTIONS : -36 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 25 TransStat_MAX_WEQGRAPH_SIZE : 2 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 35 TransStat_NO_SUPPORTING_DISEQUALITIES : 5 TransStat_NO_DISJUNCTIONS : 25 TransStat_MAX_NO_DISJUNCTIONS : 1 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 0.546622 RENAME_VARIABLES(MILLISECONDS) : 0.165207 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 0.479057 PROJECTAWAY(MILLISECONDS) : 0.112803 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.126289 DISJOIN(MILLISECONDS) : 0.000000 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.202533 ADD_EQUALITY(MILLISECONDS) : 0.060287 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.020140 #CONJOIN_DISJUNCTIVE : 34 #RENAME_VARIABLES : 64 #UNFREEZE : 0 #CONJOIN : 64 #PROJECTAWAY : 66 #ADD_WEAK_EQUALITY : 4 #DISJOIN : 0 #RENAME_VARIABLES_DISJUNCTIVE : 64 #ADD_EQUALITY : 35 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 2 * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 1]: not all allocated memory was freed not all allocated memory was freed We found a FailurePath: - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.initErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. UNSAFE Result, 0.1s OverallTime, 1 OverallIterations, 1 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 3 NumberOfCodeBlocks, 3 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 1]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 1). Cancelled while BasicCegarLoop was analyzing trace of length 55 with TraceHistMax 36, while TraceCheckSpWp was constructing forward predicates, while PredicateUnifier was unifying predicates, while SimplifyDDAWithTimeout was simplifying term of DAG size 3. - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.startErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 53.6s OverallTime, 37 OverallIterations, 36 TraceHistogramMax, 2.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 615 SDtfs, 117 SDslu, 11554 SDs, 0 SdLazy, 2569 SolverSat, 135 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5780 GetRequests, 3572 SyntacticMatches, 70 SemanticMatches, 2138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69020 ImplicationChecksByTransitivity, 33.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=55occurred in iteration=36, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 36 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.9s SatisfiabilityAnalysisTime, 45.7s InterpolantComputationTime, 3798 NumberOfCodeBlocks, 3798 NumberOfCodeBlocksAsserted, 460 NumberOfCheckSat, 6142 ConstructedInterpolants, 0 QuantifiedInterpolants, 973390 SizeOfPredicates, 70 NumberOfNonLiveVariables, 8330 ConjunctsInSsa, 1470 ConjunctsInUnsatCore, 176 InterpolantComputations, 1 PerfectInterpolantSequences, 0/38850 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 25]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 25). Cancelled while IsEmpty was searching accepting run (input had 22 states). - StatisticsResult: Ultimate Automizer benchmark data for error location: mainErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 0.0s OverallTime, 0 OverallIterations, 0 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, REUSE_STATISTICS: No data available RESULT: Ultimate proved your program to be incorrect! Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-Benchmark-0-2018-01-20_23-55-05-675.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-VPDomainBenchmark-0-2018-01-20_23-55-05-675.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-BenchmarkWithCounters-0-2018-01-20_23-55-05-675.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-0-2018-01-20_23-55-05-675.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-1-2018-01-20_23-55-05-675.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-2-2018-01-20_23-55-05-675.csv Completed graceful shutdown