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_preciseopt.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:47:53,249 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:47:53,250 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:47:53,265 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:47:53,265 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:47:53,266 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:47:53,267 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:47:53,269 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:47:53,271 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:47:53,272 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:47:53,273 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:47:53,273 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:47:53,274 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:47:53,275 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:47:53,276 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:47:53,278 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:47:53,280 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:47:53,282 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:47:53,284 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:47:53,285 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:47:53,287 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 08:47:53,292 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:47:53,292 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:47:53,293 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_preciseopt.epf [2018-01-21 08:47:53,301 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:47:53,301 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:47:53,302 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:47:53,302 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:47:53,302 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:47:53,303 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:47:53,303 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:47:53,303 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:47:53,303 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:47:53,303 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:47:53,303 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:47:53,303 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:47:53,304 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:47:53,304 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:47:53,304 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:47:53,304 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:47:53,304 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:47:53,304 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:47:53,304 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:47:53,305 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:47:53,305 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:47:53,305 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:47:53,305 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:47:53,305 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:47:53,305 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:47:53,306 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:47:53,306 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:47:53,306 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:47:53,306 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:47:53,306 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:47:53,306 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:47:53,306 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:47:53,307 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:47:53,307 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:47:53,307 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:47:53,307 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:47:53,307 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:47:53,307 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:47:53,308 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:47:53,308 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:47:53,339 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:47:53,349 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:47:53,353 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:47:53,354 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:47:53,354 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:47:53,355 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 08:47:53,473 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:47:53,477 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:47:53,478 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:47:53,478 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:47:53,483 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:47:53,484 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:47:53" (1/1) ... [2018-01-21 08:47:53,487 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64aec2c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53, skipping insertion in model container [2018-01-21 08:47:53,487 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:47:53" (1/1) ... [2018-01-21 08:47:53,499 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:47:53,513 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:47:53,618 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:47:53,635 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:47:53,641 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53 WrapperNode [2018-01-21 08:47:53,641 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:47:53,641 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:47:53,642 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:47:53,642 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:47:53,652 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53" (1/1) ... [2018-01-21 08:47:53,652 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53" (1/1) ... [2018-01-21 08:47:53,660 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53" (1/1) ... [2018-01-21 08:47:53,660 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53" (1/1) ... [2018-01-21 08:47:53,663 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53" (1/1) ... [2018-01-21 08:47:53,667 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53" (1/1) ... [2018-01-21 08:47:53,668 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53" (1/1) ... [2018-01-21 08:47:53,670 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:47:53,671 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:47:53,671 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:47:53,671 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:47:53,672 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:47:53,718 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:47:53,718 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:47:53,718 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 08:47:53,718 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:47:53,719 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:47:53,719 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:47:53,719 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:47:53,719 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:47:53,719 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:47:53,719 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 08:47:53,719 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:47:53,719 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:47:53,720 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:47:53,866 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:47:53,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:47:53 BoogieIcfgContainer [2018-01-21 08:47:53,867 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:47:53,867 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:47:53,867 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:47:53,869 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:47:53,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:47:53" (1/3) ... [2018-01-21 08:47:53,870 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b422080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:47:53, skipping insertion in model container [2018-01-21 08:47:53,870 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:53" (2/3) ... [2018-01-21 08:47:53,871 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b422080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:47:53, skipping insertion in model container [2018-01-21 08:47:53,871 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:47:53" (3/3) ... [2018-01-21 08:47:53,873 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 08:47:53,880 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:47:53,885 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 08:47:53,926 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:47:53,926 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:47:53,926 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:47:53,926 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:47:53,926 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:47:53,926 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:47:53,927 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:47:53,927 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:47:53,927 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:47:53,945 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:47:53,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:47:53,952 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:53,953 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:47:53,953 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:47:53,959 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 08:47:53,961 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:54,008 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,008 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:54,008 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,008 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:54,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:47:54,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:47:54,065 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:47:54,070 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:47:54,077 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:47:54,077 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:47:54,077 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:47:54,077 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:47:54,077 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:47:54,077 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:47:54,077 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:47:54,078 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 08:47:54,078 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:47:54,079 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:47:54,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 08:47:54,080 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:54,080 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:47:54,080 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 08:47:54,080 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 08:47:54,081 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:54,081 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,082 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:54,082 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,082 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:54,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:54,105 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:54,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:47:54,135 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:47:54,135 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:47:54,135 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:47:54,137 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:47:54,147 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:47:54,147 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:47:54,150 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:47:54,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:54,178 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:47:54,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:47:54,180 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 08:47:54,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:54,188 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:47:54,188 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:47:54,192 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:47:54,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:47:54,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:47:54,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:47:54,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:47:54,278 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 08:47:54,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:54,278 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:47:54,278 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:47:54,278 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:47:54,278 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:47:54,281 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:47:54,282 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:47:54,282 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:47:54,282 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:47:54,282 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:47:54,282 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:47:54,282 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:47:54,283 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:47:54,283 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:47:54,284 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:47:54,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 08:47:54,285 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:54,285 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:47:54,285 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:54,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 08:47:54,285 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:54,286 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,286 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:54,286 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,286 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:54,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:54,295 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:54,308 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:47:54,308 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:47:54,308 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:47:54,308 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:47:54,308 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:47:54,308 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:47:54,309 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:47:54,309 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:47:54,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:54,313 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:47:54,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:47:54,313 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 08:47:54,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:54,315 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:47:54,316 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 08:47:54,316 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:47:54,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 08:47:54,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 08:47:54,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 08:47:54,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 08:47:54,327 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 08:47:54,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:54,327 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 08:47:54,327 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:47:54,327 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 08:47:54,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:47:54,328 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:54,328 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:47:54,328 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:54,328 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 08:47:54,328 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:54,329 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,329 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:54,329 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,329 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:54,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:54,340 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:54,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:47:54,375 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:47:54,375 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:47:54,375 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:47:54,376 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:47:54,377 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:47:54,377 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:47:54,377 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 08:47:54,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:54,418 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 08:47:54,419 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:47:54,419 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 08:47:54,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:54,422 INFO L225 Difference]: With dead ends: 66 [2018-01-21 08:47:54,423 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 08:47:54,424 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:47:54,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 08:47:54,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 08:47:54,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 08:47:54,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 08:47:54,434 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 08:47:54,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:54,435 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 08:47:54,435 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:47:54,435 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 08:47:54,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 08:47:54,436 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:54,436 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:47:54,436 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:54,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 08:47:54,437 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:54,438 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,438 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:54,438 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:54,438 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:54,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:54,455 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:54,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:47:54,620 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:54,620 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:47:54,621 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 08:47:54,622 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 08:47:54,666 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:47:54,666 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:47:58,245 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:47:58,247 INFO L268 AbstractInterpreter]: Visited 30 different actions 82 times. Merged at 14 different actions 31 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 18 variables. [2018-01-21 08:47:58,262 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:47:58,262 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:58,262 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 [2018-01-21 08:47:58,274 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:58,274 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:47:58,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:58,303 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:58,340 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:47:58,340 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:58,412 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:47:58,448 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:58,449 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 [2018-01-21 08:47:58,460 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:58,460 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:47:58,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:58,497 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:58,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:47:58,504 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:58,582 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:47:58,583 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:47:58,584 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4, 4, 4] total 12 [2018-01-21 08:47:58,584 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:47:58,585 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 08:47:58,586 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 08:47:58,586 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-01-21 08:47:58,586 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-01-21 08:47:58,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:58,933 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2018-01-21 08:47:58,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 08:47:58,934 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-01-21 08:47:58,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:58,936 INFO L225 Difference]: With dead ends: 96 [2018-01-21 08:47:58,937 INFO L226 Difference]: Without dead ends: 79 [2018-01-21 08:47:58,937 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:47:58,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-01-21 08:47:58,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 50. [2018-01-21 08:47:58,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 08:47:58,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-01-21 08:47:58,948 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 31 [2018-01-21 08:47:58,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:58,949 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-01-21 08:47:58,949 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 08:47:58,949 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-01-21 08:47:58,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 08:47:58,952 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:58,952 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:47:58,952 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:58,952 INFO L82 PathProgramCache]: Analyzing trace with hash 1947199059, now seen corresponding path program 2 times [2018-01-21 08:47:58,952 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:58,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:58,954 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:58,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:58,954 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:58,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:58,974 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:59,049 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 08:47:59,050 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:59,050 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:47:59,050 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:47:59,050 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:47:59,050 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:59,051 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 [2018-01-21 08:47:59,065 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:47:59,066 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:47:59,082 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:59,093 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:59,095 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:47:59,098 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:59,219 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 08:47:59,219 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:59,590 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 08:47:59,624 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 08:47:59,625 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-21 08:47:59,625 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:47:59,625 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:47:59,625 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:47:59,626 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-21 08:47:59,626 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-01-21 08:47:59,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:59,734 INFO L93 Difference]: Finished difference Result 98 states and 109 transitions. [2018-01-21 08:47:59,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 08:47:59,734 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2018-01-21 08:47:59,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:59,736 INFO L225 Difference]: With dead ends: 98 [2018-01-21 08:47:59,736 INFO L226 Difference]: Without dead ends: 63 [2018-01-21 08:47:59,736 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 08:47:59,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-01-21 08:47:59,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2018-01-21 08:47:59,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-21 08:47:59,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2018-01-21 08:47:59,744 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 42 [2018-01-21 08:47:59,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:59,744 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2018-01-21 08:47:59,745 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:47:59,745 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2018-01-21 08:47:59,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 08:47:59,746 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:59,747 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:47:59,747 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:59,747 INFO L82 PathProgramCache]: Analyzing trace with hash 84514625, now seen corresponding path program 1 times [2018-01-21 08:47:59,747 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:59,748 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:59,749 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:47:59,749 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:59,749 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:59,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:59,769 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:59,816 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:47:59,817 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:59,817 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:47:59,817 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 48 with the following transitions: [2018-01-21 08:47:59,817 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 08:47:59,819 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:47:59,819 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:48:01,502 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:48:01,503 INFO L268 AbstractInterpreter]: Visited 34 different actions 110 times. Merged at 22 different actions 51 times. Never widened. Found 9 fixpoints after 5 different actions. Largest state had 21 variables. [2018-01-21 08:48:01,508 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:48:01,508 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:01,508 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:01,523 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:01,523 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:01,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:01,549 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:01,604 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:48:01,604 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:01,764 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:48:01,786 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:01,786 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:01,802 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:01,802 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:01,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:01,838 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:01,845 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:48:01,845 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:01,941 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:48:01,943 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:01,943 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 08:48:01,943 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:01,944 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:48:01,944 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:48:01,944 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 08:48:01,944 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand 6 states. [2018-01-21 08:48:02,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:02,027 INFO L93 Difference]: Finished difference Result 105 states and 119 transitions. [2018-01-21 08:48:02,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:48:02,028 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-21 08:48:02,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:02,029 INFO L225 Difference]: With dead ends: 105 [2018-01-21 08:48:02,029 INFO L226 Difference]: Without dead ends: 84 [2018-01-21 08:48:02,029 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 08:48:02,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-01-21 08:48:02,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 64. [2018-01-21 08:48:02,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-01-21 08:48:02,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2018-01-21 08:48:02,036 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 47 [2018-01-21 08:48:02,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:02,036 INFO L432 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2018-01-21 08:48:02,036 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:48:02,036 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2018-01-21 08:48:02,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-01-21 08:48:02,038 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:02,038 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:02,038 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:02,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1267511486, now seen corresponding path program 2 times [2018-01-21 08:48:02,038 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:02,039 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:02,039 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:02,039 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:02,039 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:02,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:02,060 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:02,172 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:48:02,172 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:02,172 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:02,172 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:02,173 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:02,173 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:02,173 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:02,184 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:02,184 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:02,195 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:02,217 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:02,230 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:02,234 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:02,396 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 08:48:02,396 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:02,529 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 08:48:02,551 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:02,551 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:02,556 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:02,556 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:02,571 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:02,593 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:02,606 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:02,612 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:02,643 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:48:02,643 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:02,749 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:48:02,751 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:02,752 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 08:48:02,752 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:02,752 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 08:48:02,753 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 08:48:02,753 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-21 08:48:02,753 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand 12 states. [2018-01-21 08:48:03,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:03,112 INFO L93 Difference]: Finished difference Result 172 states and 198 transitions. [2018-01-21 08:48:03,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 08:48:03,145 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 63 [2018-01-21 08:48:03,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:03,147 INFO L225 Difference]: With dead ends: 172 [2018-01-21 08:48:03,147 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 08:48:03,147 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 234 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-21 08:48:03,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 08:48:03,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 89. [2018-01-21 08:48:03,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-01-21 08:48:03,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2018-01-21 08:48:03,158 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 63 [2018-01-21 08:48:03,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:03,158 INFO L432 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2018-01-21 08:48:03,158 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 08:48:03,158 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2018-01-21 08:48:03,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-01-21 08:48:03,159 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:03,159 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:03,160 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:03,160 INFO L82 PathProgramCache]: Analyzing trace with hash 86499937, now seen corresponding path program 3 times [2018-01-21 08:48:03,160 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:03,160 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:03,161 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:03,161 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:03,161 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:03,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:03,184 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:03,299 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-21 08:48:03,299 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:03,299 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:03,299 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:03,300 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:03,300 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:03,300 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:03,305 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:03,306 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:03,316 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:03,321 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:03,325 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:03,331 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:03,333 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:03,337 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:03,393 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 08:48:03,394 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:03,556 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 08:48:03,589 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:03,590 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:03,595 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:03,595 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:03,610 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:03,620 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:03,639 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:03,668 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:03,681 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:03,687 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:03,697 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 08:48:03,697 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:03,768 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 08:48:03,770 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:03,770 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-21 08:48:03,770 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:03,771 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 08:48:03,771 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 08:48:03,771 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:48:03,771 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand 11 states. [2018-01-21 08:48:03,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:03,930 INFO L93 Difference]: Finished difference Result 215 states and 249 transitions. [2018-01-21 08:48:03,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 08:48:03,930 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 89 [2018-01-21 08:48:03,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:03,932 INFO L225 Difference]: With dead ends: 215 [2018-01-21 08:48:03,932 INFO L226 Difference]: Without dead ends: 186 [2018-01-21 08:48:03,933 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 344 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-21 08:48:03,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-01-21 08:48:03,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 127. [2018-01-21 08:48:03,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-01-21 08:48:03,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 147 transitions. [2018-01-21 08:48:03,943 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 147 transitions. Word has length 89 [2018-01-21 08:48:03,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:03,944 INFO L432 AbstractCegarLoop]: Abstraction has 127 states and 147 transitions. [2018-01-21 08:48:03,944 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 08:48:03,944 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 147 transitions. [2018-01-21 08:48:03,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-01-21 08:48:03,946 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:03,946 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:03,946 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:03,946 INFO L82 PathProgramCache]: Analyzing trace with hash 1835683312, now seen corresponding path program 4 times [2018-01-21 08:48:03,946 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:03,947 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:03,947 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:03,947 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:03,947 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:03,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:03,977 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:04,064 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-21 08:48:04,064 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:04,064 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:04,065 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:04,065 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:04,065 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:04,065 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:04,076 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:04,076 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:04,106 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:04,110 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:04,248 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 08:48:04,248 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:04,512 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 08:48:04,534 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:04,534 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:04,537 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:04,537 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:04,589 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:04,594 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:04,611 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 08:48:04,611 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:04,739 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 08:48:04,741 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:04,741 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-21 08:48:04,741 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:04,741 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 08:48:04,742 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 08:48:04,742 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-21 08:48:04,742 INFO L87 Difference]: Start difference. First operand 127 states and 147 transitions. Second operand 18 states. [2018-01-21 08:48:05,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:05,122 INFO L93 Difference]: Finished difference Result 335 states and 391 transitions. [2018-01-21 08:48:05,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 08:48:05,122 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 120 [2018-01-21 08:48:05,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:05,126 INFO L225 Difference]: With dead ends: 335 [2018-01-21 08:48:05,126 INFO L226 Difference]: Without dead ends: 258 [2018-01-21 08:48:05,127 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 452 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-21 08:48:05,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-01-21 08:48:05,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 162. [2018-01-21 08:48:05,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-01-21 08:48:05,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 187 transitions. [2018-01-21 08:48:05,147 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 187 transitions. Word has length 120 [2018-01-21 08:48:05,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:05,147 INFO L432 AbstractCegarLoop]: Abstraction has 162 states and 187 transitions. [2018-01-21 08:48:05,147 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 08:48:05,147 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 187 transitions. [2018-01-21 08:48:05,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-01-21 08:48:05,149 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:05,149 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:05,150 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:05,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1639693249, now seen corresponding path program 5 times [2018-01-21 08:48:05,150 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:05,150 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:05,151 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:05,151 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:05,151 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:05,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:05,180 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:05,341 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-21 08:48:05,341 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:05,341 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:05,341 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:05,341 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:05,341 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:05,341 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:05,346 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:05,347 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:05,357 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,360 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,363 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,366 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,370 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,374 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,375 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:05,378 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:05,461 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 08:48:05,461 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:05,655 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 08:48:05,676 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:05,676 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:05,679 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:05,679 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:05,692 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,698 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,709 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,722 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,744 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,771 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,787 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:05,792 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:05,811 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 08:48:05,812 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:06,030 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 08:48:06,032 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:06,032 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-21 08:48:06,032 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:06,032 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 08:48:06,033 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 08:48:06,033 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-21 08:48:06,033 INFO L87 Difference]: Start difference. First operand 162 states and 187 transitions. Second operand 18 states. [2018-01-21 08:48:06,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:06,418 INFO L93 Difference]: Finished difference Result 376 states and 433 transitions. [2018-01-21 08:48:06,419 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 08:48:06,419 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 151 [2018-01-21 08:48:06,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:06,420 INFO L225 Difference]: With dead ends: 376 [2018-01-21 08:48:06,420 INFO L226 Difference]: Without dead ends: 225 [2018-01-21 08:48:06,421 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 583 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 08:48:06,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-01-21 08:48:06,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 166. [2018-01-21 08:48:06,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-01-21 08:48:06,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 187 transitions. [2018-01-21 08:48:06,432 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 187 transitions. Word has length 151 [2018-01-21 08:48:06,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:06,433 INFO L432 AbstractCegarLoop]: Abstraction has 166 states and 187 transitions. [2018-01-21 08:48:06,433 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 08:48:06,433 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 187 transitions. [2018-01-21 08:48:06,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-01-21 08:48:06,436 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:06,436 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:06,436 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:06,436 INFO L82 PathProgramCache]: Analyzing trace with hash -1261295644, now seen corresponding path program 6 times [2018-01-21 08:48:06,436 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:06,437 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:06,437 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:06,437 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:06,438 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:06,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:06,469 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:06,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:48:06,619 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:06,619 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:06,620 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:06,620 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:06,620 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:06,620 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:06,625 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:06,625 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:06,639 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,641 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,643 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,648 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,652 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,656 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,661 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,666 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,672 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,674 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:06,677 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:06,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:48:06,705 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:06,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:48:06,839 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:06,839 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:06,842 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:06,842 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:06,860 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,868 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,885 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,909 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,943 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:06,990 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:07,059 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:07,194 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:07,374 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:07,412 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:07,421 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:07,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:48:07,439 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:07,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 08:48:07,537 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:07,537 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 08:48:07,537 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:07,538 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 08:48:07,538 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 08:48:07,538 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 08:48:07,538 INFO L87 Difference]: Start difference. First operand 166 states and 187 transitions. Second operand 11 states. [2018-01-21 08:48:07,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:07,713 INFO L93 Difference]: Finished difference Result 261 states and 295 transitions. [2018-01-21 08:48:07,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 08:48:07,714 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 187 [2018-01-21 08:48:07,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:07,716 INFO L225 Difference]: With dead ends: 261 [2018-01-21 08:48:07,716 INFO L226 Difference]: Without dead ends: 220 [2018-01-21 08:48:07,716 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 739 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 08:48:07,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-21 08:48:07,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 175. [2018-01-21 08:48:07,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-01-21 08:48:07,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 198 transitions. [2018-01-21 08:48:07,728 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 198 transitions. Word has length 187 [2018-01-21 08:48:07,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:07,728 INFO L432 AbstractCegarLoop]: Abstraction has 175 states and 198 transitions. [2018-01-21 08:48:07,728 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 08:48:07,729 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 198 transitions. [2018-01-21 08:48:07,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-01-21 08:48:07,730 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:07,730 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:07,730 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:07,731 INFO L82 PathProgramCache]: Analyzing trace with hash 2078734259, now seen corresponding path program 7 times [2018-01-21 08:48:07,731 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:07,731 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:07,732 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:07,732 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:07,732 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:07,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:07,759 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:07,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-21 08:48:07,978 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:07,978 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:07,978 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:07,978 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:07,978 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:07,979 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:07,984 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:07,984 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:08,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:08,029 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:08,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 08:48:08,144 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:08,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 08:48:08,433 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:08,433 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:08,435 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:08,435 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:08,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:08,534 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:08,568 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 08:48:08,568 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:08,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 08:48:08,747 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:08,747 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-21 08:48:08,747 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:08,747 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 08:48:08,748 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 08:48:08,748 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-21 08:48:08,748 INFO L87 Difference]: Start difference. First operand 175 states and 198 transitions. Second operand 23 states. [2018-01-21 08:48:09,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:09,145 INFO L93 Difference]: Finished difference Result 454 states and 513 transitions. [2018-01-21 08:48:09,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 08:48:09,146 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 218 [2018-01-21 08:48:09,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:09,147 INFO L225 Difference]: With dead ends: 454 [2018-01-21 08:48:09,147 INFO L226 Difference]: Without dead ends: 360 [2018-01-21 08:48:09,148 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 894 GetRequests, 839 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 08:48:09,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-01-21 08:48:09,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 215. [2018-01-21 08:48:09,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-01-21 08:48:09,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 244 transitions. [2018-01-21 08:48:09,164 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 244 transitions. Word has length 218 [2018-01-21 08:48:09,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:09,164 INFO L432 AbstractCegarLoop]: Abstraction has 215 states and 244 transitions. [2018-01-21 08:48:09,164 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 08:48:09,165 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 244 transitions. [2018-01-21 08:48:09,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2018-01-21 08:48:09,168 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:09,168 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:09,168 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:09,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1659522376, now seen corresponding path program 8 times [2018-01-21 08:48:09,169 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:09,170 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:09,170 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:09,170 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:09,170 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:09,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:09,207 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:09,477 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-21 08:48:09,477 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:09,477 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:09,477 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:09,477 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:09,477 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:09,477 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:09,482 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:09,482 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:09,502 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:09,534 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:09,540 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:09,544 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:09,794 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 08:48:09,794 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:10,103 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 08:48:10,136 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:10,136 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:10,141 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:10,141 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:10,166 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:10,228 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:10,274 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:10,285 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:10,333 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 08:48:10,334 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:10,555 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 08:48:10,556 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:10,557 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-21 08:48:10,557 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:10,557 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 08:48:10,557 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 08:48:10,558 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-21 08:48:10,558 INFO L87 Difference]: Start difference. First operand 215 states and 244 transitions. Second operand 26 states. [2018-01-21 08:48:11,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:11,229 INFO L93 Difference]: Finished difference Result 559 states and 631 transitions. [2018-01-21 08:48:11,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 08:48:11,229 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 269 [2018-01-21 08:48:11,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:11,232 INFO L225 Difference]: With dead ends: 559 [2018-01-21 08:48:11,233 INFO L226 Difference]: Without dead ends: 453 [2018-01-21 08:48:11,234 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1101 GetRequests, 1038 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 08:48:11,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2018-01-21 08:48:11,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 260. [2018-01-21 08:48:11,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2018-01-21 08:48:11,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 296 transitions. [2018-01-21 08:48:11,253 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 296 transitions. Word has length 269 [2018-01-21 08:48:11,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:11,254 INFO L432 AbstractCegarLoop]: Abstraction has 260 states and 296 transitions. [2018-01-21 08:48:11,254 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 08:48:11,254 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 296 transitions. [2018-01-21 08:48:11,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-01-21 08:48:11,259 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:11,259 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:11,259 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:11,259 INFO L82 PathProgramCache]: Analyzing trace with hash 469392129, now seen corresponding path program 9 times [2018-01-21 08:48:11,259 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:11,260 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:11,260 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:11,260 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:11,260 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:11,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:11,303 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:11,663 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-21 08:48:11,663 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:11,663 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:11,663 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:11,663 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:11,663 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:11,664 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:11,669 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:11,669 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:11,698 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,703 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,708 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,715 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,723 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,730 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,739 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,752 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,755 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:11,762 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:11,925 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 08:48:11,925 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:12,247 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 08:48:12,268 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:12,269 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:12,271 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:12,272 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:12,298 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:12,309 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:12,329 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:12,363 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:12,435 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:12,613 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:12,954 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:13,505 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:13,542 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:13,550 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:13,633 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 08:48:13,633 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:13,987 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 08:48:13,990 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:13,990 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-21 08:48:13,990 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:13,991 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 08:48:13,991 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 08:48:13,991 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-21 08:48:13,992 INFO L87 Difference]: Start difference. First operand 260 states and 296 transitions. Second operand 21 states. [2018-01-21 08:48:14,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:14,495 INFO L93 Difference]: Finished difference Result 639 states and 732 transitions. [2018-01-21 08:48:14,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 08:48:14,496 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 325 [2018-01-21 08:48:14,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:14,499 INFO L225 Difference]: With dead ends: 639 [2018-01-21 08:48:14,499 INFO L226 Difference]: Without dead ends: 586 [2018-01-21 08:48:14,501 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1318 GetRequests, 1280 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 08:48:14,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2018-01-21 08:48:14,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 318. [2018-01-21 08:48:14,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2018-01-21 08:48:14,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 367 transitions. [2018-01-21 08:48:14,527 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 367 transitions. Word has length 325 [2018-01-21 08:48:14,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:14,528 INFO L432 AbstractCegarLoop]: Abstraction has 318 states and 367 transitions. [2018-01-21 08:48:14,528 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 08:48:14,528 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 367 transitions. [2018-01-21 08:48:14,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-01-21 08:48:14,532 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:14,532 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:14,532 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:14,532 INFO L82 PathProgramCache]: Analyzing trace with hash -1594188886, now seen corresponding path program 10 times [2018-01-21 08:48:14,532 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:14,533 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:14,533 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:14,534 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:14,534 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:14,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:14,584 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:14,989 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-21 08:48:14,989 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:14,989 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:14,989 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:14,989 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:14,990 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:14,990 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:14,997 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:14,997 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:15,074 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:15,079 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:15,390 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 08:48:15,390 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:15,775 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 08:48:15,796 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:15,796 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:15,798 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:15,799 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:15,927 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:15,937 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:16,022 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 08:48:16,022 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:16,301 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 08:48:16,302 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:16,302 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-21 08:48:16,303 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:16,303 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 08:48:16,303 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 08:48:16,304 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 08:48:16,304 INFO L87 Difference]: Start difference. First operand 318 states and 367 transitions. Second operand 32 states. [2018-01-21 08:48:17,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:17,615 INFO L93 Difference]: Finished difference Result 837 states and 962 transitions. [2018-01-21 08:48:17,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 08:48:17,616 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 386 [2018-01-21 08:48:17,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:17,621 INFO L225 Difference]: With dead ends: 837 [2018-01-21 08:48:17,621 INFO L226 Difference]: Without dead ends: 697 [2018-01-21 08:48:17,624 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1575 GetRequests, 1496 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 08:48:17,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2018-01-21 08:48:17,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 373. [2018-01-21 08:48:17,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373 states. [2018-01-21 08:48:17,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 428 transitions. [2018-01-21 08:48:17,655 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 428 transitions. Word has length 386 [2018-01-21 08:48:17,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:17,656 INFO L432 AbstractCegarLoop]: Abstraction has 373 states and 428 transitions. [2018-01-21 08:48:17,656 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 08:48:17,656 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 428 transitions. [2018-01-21 08:48:17,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2018-01-21 08:48:17,660 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:17,660 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:17,661 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:17,661 INFO L82 PathProgramCache]: Analyzing trace with hash -655925471, now seen corresponding path program 11 times [2018-01-21 08:48:17,661 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:17,662 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:17,662 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:17,662 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:17,662 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:17,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:17,716 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:18,192 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-21 08:48:18,192 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:18,193 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:18,193 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:18,193 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:18,193 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:18,193 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:18,200 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:18,200 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:18,228 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:18,259 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:18,272 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:18,283 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:18,291 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:18,305 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:18,318 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:18,332 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:18,335 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:18,342 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:18,780 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 08:48:18,780 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:19,417 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 08:48:19,452 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:19,452 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:19,456 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:19,456 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:19,491 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:19,508 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:19,545 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:19,605 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:19,703 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:19,885 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:20,119 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:20,439 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:20,498 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:20,512 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:20,641 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 08:48:20,642 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:21,042 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 08:48:21,045 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:21,045 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19, 19, 19, 19] total 40 [2018-01-21 08:48:21,045 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:21,046 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 08:48:21,046 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 08:48:21,046 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1305, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 08:48:21,046 INFO L87 Difference]: Start difference. First operand 373 states and 428 transitions. Second operand 32 states. [2018-01-21 08:48:22,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:22,269 INFO L93 Difference]: Finished difference Result 727 states and 820 transitions. [2018-01-21 08:48:22,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 08:48:22,269 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 447 [2018-01-21 08:48:22,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:22,272 INFO L225 Difference]: With dead ends: 727 [2018-01-21 08:48:22,272 INFO L226 Difference]: Without dead ends: 575 [2018-01-21 08:48:22,274 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1842 GetRequests, 1753 SyntacticMatches, 22 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1373 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=773, Invalid=3919, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 08:48:22,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2018-01-21 08:48:22,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 374. [2018-01-21 08:48:22,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2018-01-21 08:48:22,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 429 transitions. [2018-01-21 08:48:22,294 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 429 transitions. Word has length 447 [2018-01-21 08:48:22,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:22,294 INFO L432 AbstractCegarLoop]: Abstraction has 374 states and 429 transitions. [2018-01-21 08:48:22,294 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 08:48:22,294 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 429 transitions. [2018-01-21 08:48:22,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2018-01-21 08:48:22,297 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:22,297 INFO L322 BasicCegarLoop]: trace histogram [81, 68, 68, 68, 68, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:22,297 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:22,297 INFO L82 PathProgramCache]: Analyzing trace with hash 832198916, now seen corresponding path program 12 times [2018-01-21 08:48:22,297 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:22,298 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:22,298 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:22,298 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:22,298 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:22,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:22,337 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:22,913 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 0 proven. 416 refuted. 0 times theorem prover too weak. 13626 trivial. 0 not checked. [2018-01-21 08:48:22,914 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:22,914 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:22,914 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:22,914 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:22,914 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:22,914 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:22,919 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:22,919 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:22,949 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:22,954 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:22,958 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:22,965 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:22,971 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:22,981 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:22,987 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:22,997 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:23,008 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:23,018 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:23,028 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:23,041 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:23,060 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:23,072 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:23,086 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:23,103 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:23,105 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:23,111 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:23,375 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 08:48:23,376 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:24,287 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 08:48:24,310 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:24,310 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 28 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 28 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:24,313 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:24,313 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:24,354 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:24,368 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:24,408 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:24,466 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:24,616 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:25,010 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:28,342 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:31,526 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown