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_smtcomp.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:35:23,562 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:35:23,564 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:35:23,579 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:35:23,580 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:35:23,581 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:35:23,582 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:35:23,583 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:35:23,586 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:35:23,587 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:35:23,588 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:35:23,588 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:35:23,589 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:35:23,590 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:35:23,591 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:35:23,594 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:35:23,596 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:35:23,598 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:35:23,599 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:35:23,601 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:35:23,603 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 10:35:23,608 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:35:23,609 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:35:23,609 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_smtcomp.epf [2018-01-21 10:35:23,618 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:35:23,618 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:35:23,619 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:35:23,619 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:35:23,619 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:35:23,619 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:35:23,619 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:35:23,619 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:35:23,620 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:35:23,620 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:35:23,620 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:35:23,621 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:35:23,621 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:35:23,621 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:35:23,621 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:35:23,621 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:35:23,621 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:35:23,621 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:35:23,622 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:35:23,622 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:35:23,622 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:35:23,622 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:35:23,622 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:35:23,622 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:35:23,623 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:35:23,623 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:35:23,623 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:35:23,623 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:35:23,623 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:35:23,624 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:35:23,624 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:35:23,624 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:35:23,624 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:35:23,624 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:35:23,624 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:35:23,624 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:35:23,624 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:35:23,625 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:35:23,625 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:35:23,658 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:35:23,669 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:35:23,673 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:35:23,674 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:35:23,675 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:35:23,675 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c [2018-01-21 10:35:23,879 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:35:23,884 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:35:23,885 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:35:23,885 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:35:23,890 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:35:23,890 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:35:23" (1/1) ... [2018-01-21 10:35:23,893 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5530d006 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:23, skipping insertion in model container [2018-01-21 10:35:23,893 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:35:23" (1/1) ... [2018-01-21 10:35:23,907 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:35:23,923 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:35:24,037 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:35:24,052 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:35:24,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24 WrapperNode [2018-01-21 10:35:24,060 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:35:24,060 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:35:24,060 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:35:24,060 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:35:24,072 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24" (1/1) ... [2018-01-21 10:35:24,072 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24" (1/1) ... [2018-01-21 10:35:24,079 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24" (1/1) ... [2018-01-21 10:35:24,080 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24" (1/1) ... [2018-01-21 10:35:24,082 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24" (1/1) ... [2018-01-21 10:35:24,085 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24" (1/1) ... [2018-01-21 10:35:24,086 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24" (1/1) ... [2018-01-21 10:35:24,087 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:35:24,087 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:35:24,087 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:35:24,088 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:35:24,088 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24" (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 10:35:24,135 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:35:24,135 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:35:24,136 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 10:35:24,136 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:35:24,136 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:35:24,136 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:35:24,136 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:35:24,136 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:35:24,136 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:35:24,136 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 10:35:24,136 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:35:24,136 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:35:24,137 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:35:24,316 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:35:24,317 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:35:24 BoogieIcfgContainer [2018-01-21 10:35:24,317 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:35:24,317 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:35:24,317 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:35:24,319 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:35:24,319 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:35:23" (1/3) ... [2018-01-21 10:35:24,320 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@322bcf18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:35:24, skipping insertion in model container [2018-01-21 10:35:24,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:24" (2/3) ... [2018-01-21 10:35:24,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@322bcf18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:35:24, skipping insertion in model container [2018-01-21 10:35:24,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:35:24" (3/3) ... [2018-01-21 10:35:24,323 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c [2018-01-21 10:35:24,329 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:35:24,335 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 10:35:24,371 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:35:24,371 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:35:24,372 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:35:24,372 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:35:24,372 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:35:24,372 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:35:24,372 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:35:24,372 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:35:24,373 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:35:24,391 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:35:24,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:35:24,398 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:24,399 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:35:24,399 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:35:24,405 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 10:35:24,408 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:24,455 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,455 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:24,455 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,455 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:24,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:35:24,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:35:24,514 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:35:24,520 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:35:24,525 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:35:24,526 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:35:24,526 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:35:24,526 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:35:24,526 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:35:24,526 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:35:24,526 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:35:24,526 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 10:35:24,526 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:35:24,527 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:35:24,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 10:35:24,528 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:24,529 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:24,529 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 10:35:24,529 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 10:35:24,529 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:24,530 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,530 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:24,530 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,530 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:24,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:24,554 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:24,583 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 10:35:24,585 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:35:24,585 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:35:24,585 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:35:24,586 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:35:24,597 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:35:24,597 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:35:24,600 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:35:24,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:24,631 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:35:24,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:35:24,632 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 10:35:24,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:24,640 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:35:24,641 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 10:35:24,645 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 10:35:24,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 10:35:24,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 10:35:24,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 10:35:24,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 10:35:24,733 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 10:35:24,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:24,733 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 10:35:24,733 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:35:24,733 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 10:35:24,734 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 10:35:24,737 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:35:24,737 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:35:24,737 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:35:24,737 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:35:24,737 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:35:24,737 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:35:24,738 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:35:24,738 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:35:24,738 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:35:24,740 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:35:24,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 10:35:24,742 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:24,742 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 10:35:24,742 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:24,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 10:35:24,743 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:24,744 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,744 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:24,744 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,744 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:24,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:24,750 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:24,761 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 10:35:24,761 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:35:24,762 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:35:24,762 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:35:24,762 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:35:24,763 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:35:24,763 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:35:24,763 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:35:24,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:24,768 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:35:24,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:35:24,768 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 10:35:24,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:24,770 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:35:24,770 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 10:35:24,771 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 10:35:24,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 10:35:24,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 10:35:24,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 10:35:24,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 10:35:24,782 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 10:35:24,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:24,783 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 10:35:24,783 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:35:24,783 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 10:35:24,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 10:35:24,784 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:24,784 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 10:35:24,784 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:24,785 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 10:35:24,785 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:24,786 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,786 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:24,786 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,787 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:24,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:24,797 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:24,839 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 10:35:24,839 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:35:24,839 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:35:24,839 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:35:24,841 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:35:24,841 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:35:24,842 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:35:24,842 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 10:35:24,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:24,904 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 10:35:24,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:35:24,905 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 10:35:24,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:24,909 INFO L225 Difference]: With dead ends: 66 [2018-01-21 10:35:24,909 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 10:35:24,910 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 10:35:24,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 10:35:24,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 10:35:24,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 10:35:24,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 10:35:24,921 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 10:35:24,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:24,922 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 10:35:24,922 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:35:24,922 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 10:35:24,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 10:35:24,923 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:24,924 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 10:35:24,924 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:24,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 10:35:24,924 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:24,925 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,925 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:24,926 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,926 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:24,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:24,948 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:25,079 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 10:35:25,080 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:25,080 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:25,081 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 10:35:25,083 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 10:35:25,142 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:35:25,142 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:35:26,496 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:35:26,498 INFO L268 AbstractInterpreter]: Visited 30 different actions 82 times. Merged at 14 different actions 31 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 17 variables. [2018-01-21 10:35:26,509 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:35:26,509 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:26,510 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 10:35:26,525 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:26,526 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:26,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:26,555 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:26,636 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:35:26,637 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:26,845 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:35:26,878 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 10:35:26,879 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [8] total 12 [2018-01-21 10:35:26,879 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:35:26,880 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:35:26,880 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:35:26,880 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2018-01-21 10:35:26,880 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 10:35:27,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:27,102 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 10:35:27,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 10:35:27,103 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 10:35:27,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:27,104 INFO L225 Difference]: With dead ends: 80 [2018-01-21 10:35:27,104 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 10:35:27,105 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2018-01-21 10:35:27,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 10:35:27,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 10:35:27,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 10:35:27,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 10:35:27,113 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 10:35:27,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:27,113 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 10:35:27,114 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:35:27,114 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 10:35:27,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 10:35:27,115 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:27,115 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:27,115 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:27,116 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 10:35:27,116 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:27,117 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:27,117 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:27,117 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:27,117 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:27,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:27,133 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:27,196 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:35:27,196 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:27,196 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:27,197 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 10:35:27,197 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 10:35:27,199 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:35:27,199 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:35:27,922 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:35:27,923 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 10:35:27,939 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:35:27,939 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:27,939 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:35:27,947 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:27,947 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:27,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:27,969 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:27,981 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:35:27,982 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:28,029 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:35:28,062 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:28,063 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:35:28,069 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:28,069 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:28,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:28,107 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:28,114 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:35:28,114 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:28,145 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:35:28,147 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:28,147 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 10:35:28,147 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:28,148 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:35:28,148 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:35:28,148 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 10:35:28,148 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 5 states. [2018-01-21 10:35:28,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:28,214 INFO L93 Difference]: Finished difference Result 84 states and 94 transitions. [2018-01-21 10:35:28,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 10:35:28,215 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2018-01-21 10:35:28,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:28,216 INFO L225 Difference]: With dead ends: 84 [2018-01-21 10:35:28,216 INFO L226 Difference]: Without dead ends: 67 [2018-01-21 10:35:28,217 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 10:35:28,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-01-21 10:35:28,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 52. [2018-01-21 10:35:28,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-21 10:35:28,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2018-01-21 10:35:28,224 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 36 [2018-01-21 10:35:28,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:28,225 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2018-01-21 10:35:28,225 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:35:28,225 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2018-01-21 10:35:28,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 10:35:28,228 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:28,228 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:28,228 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:28,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1862415341, now seen corresponding path program 2 times [2018-01-21 10:35:28,228 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:28,229 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:28,229 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:28,229 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:28,230 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:28,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:28,252 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:28,332 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 10:35:28,332 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:28,332 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:28,332 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:28,333 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:28,333 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:28,333 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 10:35:28,350 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:35:28,350 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:28,370 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:28,386 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:28,399 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:28,402 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:28,659 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 10:35:28,659 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:29,251 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 10:35:29,272 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:29,272 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 10:35:29,278 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:35:29,278 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:29,295 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:29,319 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:29,328 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:29,334 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:29,375 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 10:35:29,375 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:29,460 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 10:35:29,462 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:29,462 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 16 [2018-01-21 10:35:29,462 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:29,463 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:35:29,463 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:35:29,463 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2018-01-21 10:35:29,463 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 10 states. [2018-01-21 10:35:29,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:29,654 INFO L93 Difference]: Finished difference Result 148 states and 168 transitions. [2018-01-21 10:35:29,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 10:35:29,655 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 52 [2018-01-21 10:35:29,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:29,657 INFO L225 Difference]: With dead ends: 148 [2018-01-21 10:35:29,657 INFO L226 Difference]: Without dead ends: 111 [2018-01-21 10:35:29,658 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 193 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-01-21 10:35:29,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-01-21 10:35:29,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 77. [2018-01-21 10:35:29,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-21 10:35:29,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2018-01-21 10:35:29,667 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 52 [2018-01-21 10:35:29,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:29,668 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2018-01-21 10:35:29,668 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:35:29,668 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2018-01-21 10:35:29,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-01-21 10:35:29,670 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:29,671 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:29,671 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:29,671 INFO L82 PathProgramCache]: Analyzing trace with hash 298957008, now seen corresponding path program 3 times [2018-01-21 10:35:29,671 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:29,672 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:29,672 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:29,673 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:29,673 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:29,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:29,695 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:29,783 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:35:29,783 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:29,783 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:29,783 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:29,783 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:29,783 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:29,783 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 10:35:29,789 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:35:29,789 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:35:29,800 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:29,807 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:29,813 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:29,819 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:29,822 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:29,826 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:29,880 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 64 proven. 9 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2018-01-21 10:35:29,881 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:30,130 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 64 proven. 9 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2018-01-21 10:35:30,150 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:30,150 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 10:35:30,153 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:35:30,153 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:35:30,167 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:30,177 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:30,194 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:30,216 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:30,226 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:30,231 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:30,271 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:35:30,271 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:30,317 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:35:30,318 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:30,319 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 10:35:30,319 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:30,319 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:35:30,320 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:35:30,320 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2018-01-21 10:35:30,320 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand 10 states. [2018-01-21 10:35:30,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:30,485 INFO L93 Difference]: Finished difference Result 194 states and 220 transitions. [2018-01-21 10:35:30,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 10:35:30,485 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 78 [2018-01-21 10:35:30,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:30,487 INFO L225 Difference]: With dead ends: 194 [2018-01-21 10:35:30,487 INFO L226 Difference]: Without dead ends: 169 [2018-01-21 10:35:30,488 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 298 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:35:30,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-01-21 10:35:30,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 115. [2018-01-21 10:35:30,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-21 10:35:30,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 130 transitions. [2018-01-21 10:35:30,502 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 130 transitions. Word has length 78 [2018-01-21 10:35:30,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:30,502 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 130 transitions. [2018-01-21 10:35:30,502 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:35:30,502 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 130 transitions. [2018-01-21 10:35:30,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-01-21 10:35:30,504 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:30,505 INFO L322 BasicCegarLoop]: trace histogram [13, 9, 9, 9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:30,505 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:30,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1844537761, now seen corresponding path program 4 times [2018-01-21 10:35:30,505 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:30,506 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:30,506 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:30,506 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:30,506 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:30,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:30,531 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:30,694 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 10:35:30,694 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:30,695 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:30,695 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:30,695 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:30,695 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:30,695 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 10:35:30,710 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:35:30,711 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:35:30,747 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:30,750 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:30,910 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 10:35:30,910 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:31,062 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 10:35:31,083 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:31,083 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 10:35:31,087 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:35:31,087 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:35:31,126 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:31,131 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:31,144 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 10:35:31,145 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:31,261 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 10:35:31,263 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:31,263 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 11, 11, 11] total 20 [2018-01-21 10:35:31,263 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:31,264 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 10:35:31,264 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 10:35:31,264 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2018-01-21 10:35:31,264 INFO L87 Difference]: Start difference. First operand 115 states and 130 transitions. Second operand 16 states. [2018-01-21 10:35:31,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:31,522 INFO L93 Difference]: Finished difference Result 311 states and 357 transitions. [2018-01-21 10:35:31,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 10:35:31,522 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2018-01-21 10:35:31,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:31,525 INFO L225 Difference]: With dead ends: 311 [2018-01-21 10:35:31,525 INFO L226 Difference]: Without dead ends: 241 [2018-01-21 10:35:31,526 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 411 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=156, Invalid=600, Unknown=0, NotChecked=0, Total=756 [2018-01-21 10:35:31,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2018-01-21 10:35:31,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 150. [2018-01-21 10:35:31,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-01-21 10:35:31,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 169 transitions. [2018-01-21 10:35:31,546 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 169 transitions. Word has length 109 [2018-01-21 10:35:31,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:31,546 INFO L432 AbstractCegarLoop]: Abstraction has 150 states and 169 transitions. [2018-01-21 10:35:31,546 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 10:35:31,546 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 169 transitions. [2018-01-21 10:35:31,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-01-21 10:35:31,549 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:31,549 INFO L322 BasicCegarLoop]: trace histogram [18, 13, 13, 13, 13, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:31,550 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:31,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1349347824, now seen corresponding path program 5 times [2018-01-21 10:35:31,550 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:31,551 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:31,551 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:31,551 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:31,551 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:31,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:31,580 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:31,660 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 580 trivial. 0 not checked. [2018-01-21 10:35:31,660 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:31,660 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:31,661 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:31,661 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:31,661 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:31,661 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 10:35:31,667 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:35:31,667 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:31,677 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:31,678 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:31,680 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:31,682 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:31,686 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:31,691 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:31,692 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:31,695 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:31,773 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 392 proven. 49 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-01-21 10:35:31,773 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:31,965 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 95 proven. 270 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2018-01-21 10:35:31,985 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:31,985 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 10:35:31,988 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:35:31,988 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:32,001 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:32,004 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:32,010 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:32,020 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:32,036 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:32,057 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:32,069 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:32,073 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:32,109 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 392 proven. 49 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-01-21 10:35:32,109 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:32,300 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 95 proven. 270 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2018-01-21 10:35:32,302 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:32,302 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 11, 11, 11] total 22 [2018-01-21 10:35:32,302 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:32,302 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 10:35:32,303 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 10:35:32,303 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:35:32,303 INFO L87 Difference]: Start difference. First operand 150 states and 169 transitions. Second operand 17 states. [2018-01-21 10:35:32,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:32,699 INFO L93 Difference]: Finished difference Result 336 states and 379 transitions. [2018-01-21 10:35:32,699 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 10:35:32,699 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 140 [2018-01-21 10:35:32,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:32,700 INFO L225 Difference]: With dead ends: 336 [2018-01-21 10:35:32,700 INFO L226 Difference]: Without dead ends: 197 [2018-01-21 10:35:32,701 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 539 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=243, Invalid=1089, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 10:35:32,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-01-21 10:35:32,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 151. [2018-01-21 10:35:32,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-01-21 10:35:32,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 166 transitions. [2018-01-21 10:35:32,714 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 166 transitions. Word has length 140 [2018-01-21 10:35:32,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:32,714 INFO L432 AbstractCegarLoop]: Abstraction has 151 states and 166 transitions. [2018-01-21 10:35:32,714 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 10:35:32,714 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 166 transitions. [2018-01-21 10:35:32,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-01-21 10:35:32,716 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:32,716 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:32,716 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:32,716 INFO L82 PathProgramCache]: Analyzing trace with hash -1936414061, now seen corresponding path program 6 times [2018-01-21 10:35:32,716 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:32,717 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:32,717 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:32,717 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:32,717 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:32,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:32,745 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:32,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:35:32,891 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:32,935 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:32,936 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:32,936 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:32,936 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:32,936 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 10:35:32,941 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:35:32,942 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:35:32,955 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:32,959 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:32,962 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:32,965 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:32,968 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:32,972 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:32,977 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:32,980 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:32,986 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:32,988 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:32,991 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:33,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:35:33,036 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:33,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:35:33,192 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:33,192 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 10:35:33,196 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:35:33,196 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:35:33,212 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:33,222 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:33,235 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:33,252 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:33,272 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:33,299 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:33,335 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:33,438 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:33,568 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:33,588 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:33,595 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:33,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:35:33,612 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:33,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:35:33,685 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:33,685 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 10:35:33,685 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:33,686 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:35:33,686 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:35:33,686 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:35:33,686 INFO L87 Difference]: Start difference. First operand 151 states and 166 transitions. Second operand 10 states. [2018-01-21 10:35:33,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:33,756 INFO L93 Difference]: Finished difference Result 237 states and 264 transitions. [2018-01-21 10:35:33,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 10:35:33,756 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 176 [2018-01-21 10:35:33,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:33,758 INFO L225 Difference]: With dead ends: 237 [2018-01-21 10:35:33,758 INFO L226 Difference]: Without dead ends: 200 [2018-01-21 10:35:33,759 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 696 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:35:33,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-01-21 10:35:33,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 160. [2018-01-21 10:35:33,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-01-21 10:35:33,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 177 transitions. [2018-01-21 10:35:33,773 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 177 transitions. Word has length 176 [2018-01-21 10:35:33,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:33,774 INFO L432 AbstractCegarLoop]: Abstraction has 160 states and 177 transitions. [2018-01-21 10:35:33,774 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:35:33,774 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 177 transitions. [2018-01-21 10:35:33,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-01-21 10:35:33,776 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:33,776 INFO L322 BasicCegarLoop]: trace histogram [29, 22, 22, 22, 22, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:33,776 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:33,776 INFO L82 PathProgramCache]: Analyzing trace with hash -984621276, now seen corresponding path program 7 times [2018-01-21 10:35:33,776 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:33,777 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:33,777 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:33,777 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:33,777 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:33,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:33,803 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:33,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-01-21 10:35:33,969 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:33,969 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:33,969 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:33,969 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:33,969 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:33,969 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 10:35:33,974 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:33,974 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:34,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:34,016 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:34,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 1134 proven. 38 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2018-01-21 10:35:34,115 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:34,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 378 proven. 240 refuted. 0 times theorem prover too weak. 1090 trivial. 0 not checked. [2018-01-21 10:35:34,359 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:34,359 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 10:35:34,362 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:34,363 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:34,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:34,447 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:34,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 1134 proven. 38 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2018-01-21 10:35:34,487 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:34,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 378 proven. 240 refuted. 0 times theorem prover too weak. 1090 trivial. 0 not checked. [2018-01-21 10:35:34,684 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:34,685 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 13, 13] total 26 [2018-01-21 10:35:34,685 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:34,685 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 10:35:34,685 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 10:35:34,686 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-01-21 10:35:34,686 INFO L87 Difference]: Start difference. First operand 160 states and 177 transitions. Second operand 21 states. [2018-01-21 10:35:35,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:35,035 INFO L93 Difference]: Finished difference Result 392 states and 439 transitions. [2018-01-21 10:35:35,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 10:35:35,036 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 207 [2018-01-21 10:35:35,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:35,038 INFO L225 Difference]: With dead ends: 392 [2018-01-21 10:35:35,038 INFO L226 Difference]: Without dead ends: 305 [2018-01-21 10:35:35,038 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 798 SyntacticMatches, 14 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=270, Invalid=1136, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:35:35,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2018-01-21 10:35:35,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 200. [2018-01-21 10:35:35,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-01-21 10:35:35,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 222 transitions. [2018-01-21 10:35:35,052 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 222 transitions. Word has length 207 [2018-01-21 10:35:35,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:35,052 INFO L432 AbstractCegarLoop]: Abstraction has 200 states and 222 transitions. [2018-01-21 10:35:35,052 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 10:35:35,052 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 222 transitions. [2018-01-21 10:35:35,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-01-21 10:35:35,054 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:35,055 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:35,055 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:35,055 INFO L82 PathProgramCache]: Analyzing trace with hash 446009255, now seen corresponding path program 8 times [2018-01-21 10:35:35,055 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:35,056 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:35,056 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:35,056 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:35,056 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:35,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:35,088 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:35,343 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 10:35:35,343 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:35,343 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:35,344 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:35,344 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:35,344 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:35,344 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 10:35:35,349 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:35:35,349 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:35,364 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:35,387 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:35,392 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:35,396 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:35,587 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 1895 proven. 60 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2018-01-21 10:35:35,587 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:35,832 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 623 proven. 360 refuted. 0 times theorem prover too weak. 1996 trivial. 0 not checked. [2018-01-21 10:35:35,852 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:35,852 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 10:35:35,855 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:35:35,855 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:35,884 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:35,932 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:35,968 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:35,976 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:36,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 1895 proven. 60 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2018-01-21 10:35:36,011 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:36,178 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 623 proven. 360 refuted. 0 times theorem prover too weak. 1996 trivial. 0 not checked. [2018-01-21 10:35:36,179 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:36,179 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15, 15, 15] total 30 [2018-01-21 10:35:36,179 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:36,180 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 10:35:36,180 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 10:35:36,180 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2018-01-21 10:35:36,180 INFO L87 Difference]: Start difference. First operand 200 states and 222 transitions. Second operand 24 states. [2018-01-21 10:35:36,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:36,638 INFO L93 Difference]: Finished difference Result 489 states and 547 transitions. [2018-01-21 10:35:36,638 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 10:35:36,638 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 258 [2018-01-21 10:35:36,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:36,640 INFO L225 Difference]: With dead ends: 489 [2018-01-21 10:35:36,640 INFO L226 Difference]: Without dead ends: 390 [2018-01-21 10:35:36,641 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1055 GetRequests, 997 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=352, Invalid=1540, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 10:35:36,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2018-01-21 10:35:36,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 245. [2018-01-21 10:35:36,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-01-21 10:35:36,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 273 transitions. [2018-01-21 10:35:36,658 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 273 transitions. Word has length 258 [2018-01-21 10:35:36,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:36,659 INFO L432 AbstractCegarLoop]: Abstraction has 245 states and 273 transitions. [2018-01-21 10:35:36,659 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 10:35:36,659 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 273 transitions. [2018-01-21 10:35:36,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-01-21 10:35:36,662 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:36,662 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:36,662 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:36,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1567268592, now seen corresponding path program 9 times [2018-01-21 10:35:36,663 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:36,663 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:36,663 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:36,663 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:36,664 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:36,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:36,694 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:36,974 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 10:35:36,974 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:36,974 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:36,974 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:36,975 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:36,975 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:36,975 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 10:35:36,982 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:35:36,982 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:35:37,011 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,015 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,020 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,026 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,033 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,038 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,042 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,048 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,049 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:37,055 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:37,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 10:35:37,237 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:37,659 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 10:35:37,680 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:37,680 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 10:35:37,684 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:35:37,684 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:35:37,716 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,726 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,745 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,767 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,822 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:37,936 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:38,181 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:38,602 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:38,626 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:38,636 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:38,707 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 10:35:38,707 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:39,005 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 10:35:39,008 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:39,008 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-01-21 10:35:39,008 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:39,009 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 10:35:39,009 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 10:35:39,010 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2018-01-21 10:35:39,010 INFO L87 Difference]: Start difference. First operand 245 states and 273 transitions. Second operand 20 states. [2018-01-21 10:35:39,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:39,627 INFO L93 Difference]: Finished difference Result 564 states and 641 transitions. [2018-01-21 10:35:39,627 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 10:35:39,627 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 314 [2018-01-21 10:35:39,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:39,630 INFO L225 Difference]: With dead ends: 564 [2018-01-21 10:35:39,630 INFO L226 Difference]: Without dead ends: 515 [2018-01-21 10:35:39,631 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1273 GetRequests, 1236 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 10:35:39,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2018-01-21 10:35:39,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 303. [2018-01-21 10:35:39,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 303 states. [2018-01-21 10:35:39,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 343 transitions. [2018-01-21 10:35:39,650 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 343 transitions. Word has length 314 [2018-01-21 10:35:39,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:39,650 INFO L432 AbstractCegarLoop]: Abstraction has 303 states and 343 transitions. [2018-01-21 10:35:39,650 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 10:35:39,650 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 343 transitions. [2018-01-21 10:35:39,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2018-01-21 10:35:39,652 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:39,652 INFO L322 BasicCegarLoop]: trace histogram [59, 49, 49, 49, 49, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:39,652 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:39,653 INFO L82 PathProgramCache]: Analyzing trace with hash -1827967461, now seen corresponding path program 10 times [2018-01-21 10:35:39,653 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:39,653 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:39,653 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:39,653 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:39,653 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:39,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:39,696 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:40,026 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 7130 trivial. 0 not checked. [2018-01-21 10:35:40,026 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:40,026 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:40,026 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:40,026 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:40,027 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:40,027 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 10:35:40,032 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:35:40,032 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:35:40,090 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:40,095 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:40,309 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 4311 proven. 119 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2018-01-21 10:35:40,309 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:40,691 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 1401 proven. 675 refuted. 0 times theorem prover too weak. 5299 trivial. 0 not checked. [2018-01-21 10:35:40,711 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:40,711 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 10:35:40,714 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:35:40,714 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:35:40,835 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:40,846 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:40,924 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 4311 proven. 119 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2018-01-21 10:35:40,925 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:41,193 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 1401 proven. 675 refuted. 0 times theorem prover too weak. 5299 trivial. 0 not checked. [2018-01-21 10:35:41,195 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:41,196 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 38 [2018-01-21 10:35:41,196 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:41,196 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 10:35:41,197 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 10:35:41,197 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1149, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:35:41,197 INFO L87 Difference]: Start difference. First operand 303 states and 343 transitions. Second operand 30 states. [2018-01-21 10:35:42,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:42,421 INFO L93 Difference]: Finished difference Result 751 states and 858 transitions. [2018-01-21 10:35:42,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 10:35:42,421 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 375 [2018-01-21 10:35:42,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:42,425 INFO L225 Difference]: With dead ends: 751 [2018-01-21 10:35:42,425 INFO L226 Difference]: Without dead ends: 618 [2018-01-21 10:35:42,427 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1529 GetRequests, 1455 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=549, Invalid=2531, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 10:35:42,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2018-01-21 10:35:42,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 358. [2018-01-21 10:35:42,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 358 states. [2018-01-21 10:35:42,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 403 transitions. [2018-01-21 10:35:42,455 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 403 transitions. Word has length 375 [2018-01-21 10:35:42,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:42,456 INFO L432 AbstractCegarLoop]: Abstraction has 358 states and 403 transitions. [2018-01-21 10:35:42,456 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 10:35:42,456 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 403 transitions. [2018-01-21 10:35:42,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2018-01-21 10:35:42,460 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:42,460 INFO L322 BasicCegarLoop]: trace histogram [70, 59, 59, 59, 59, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:42,461 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:42,461 INFO L82 PathProgramCache]: Analyzing trace with hash -940109232, now seen corresponding path program 11 times [2018-01-21 10:35:42,461 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:42,462 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:42,462 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:42,462 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:42,462 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:42,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:42,509 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:43,021 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 10183 trivial. 0 not checked. [2018-01-21 10:35:43,021 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:43,058 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:43,058 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:43,059 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:43,059 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:43,059 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 10:35:43,066 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:35:43,066 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:43,100 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:43,106 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:43,112 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:43,118 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:43,125 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:43,132 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:43,139 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:43,146 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:43,147 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:43,152 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:43,424 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 6200 proven. 517 refuted. 0 times theorem prover too weak. 3763 trivial. 0 not checked. [2018-01-21 10:35:43,425 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:44,018 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 1065 proven. 2348 refuted. 0 times theorem prover too weak. 7067 trivial. 0 not checked. [2018-01-21 10:35:44,038 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:44,038 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 10:35:44,041 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:35:44,041 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:44,072 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,088 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,124 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,180 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,312 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,392 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,496 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,631 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,673 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:44,684 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:44,829 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 6116 proven. 427 refuted. 0 times theorem prover too weak. 3937 trivial. 0 not checked. [2018-01-21 10:35:44,829 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:45,269 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 971 proven. 1932 refuted. 0 times theorem prover too weak. 7577 trivial. 0 not checked. [2018-01-21 10:35:45,271 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:45,272 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19, 19, 19] total 47 [2018-01-21 10:35:45,272 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:45,273 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 10:35:45,273 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 10:35:45,274 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1871, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 10:35:45,274 INFO L87 Difference]: Start difference. First operand 358 states and 403 transitions. Second operand 31 states. [2018-01-21 10:35:47,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:47,461 INFO L93 Difference]: Finished difference Result 835 states and 939 transitions. [2018-01-21 10:35:47,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-01-21 10:35:47,462 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 436 [2018-01-21 10:35:47,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:47,465 INFO L225 Difference]: With dead ends: 835 [2018-01-21 10:35:47,465 INFO L226 Difference]: Without dead ends: 469 [2018-01-21 10:35:47,470 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1785 GetRequests, 1693 SyntacticMatches, 18 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1741 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=906, Invalid=4794, Unknown=0, NotChecked=0, Total=5700 [2018-01-21 10:35:47,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2018-01-21 10:35:47,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 364. [2018-01-21 10:35:47,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2018-01-21 10:35:47,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 400 transitions. [2018-01-21 10:35:47,502 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 400 transitions. Word has length 436 [2018-01-21 10:35:47,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:47,503 INFO L432 AbstractCegarLoop]: Abstraction has 364 states and 400 transitions. [2018-01-21 10:35:47,503 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 10:35:47,503 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 400 transitions. [2018-01-21 10:35:47,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2018-01-21 10:35:47,507 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:47,507 INFO L322 BasicCegarLoop]: trace histogram [80, 68, 68, 68, 68, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:47,507 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:47,508 INFO L82 PathProgramCache]: Analyzing trace with hash 270709555, now seen corresponding path program 12 times [2018-01-21 10:35:47,508 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:47,508 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:47,509 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:47,509 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:47,509 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:47,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:47,562 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:48,235 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 13418 trivial. 0 not checked. [2018-01-21 10:35:48,247 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:48,247 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:48,248 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:48,248 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:48,248 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:48,248 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 10:35:48,255 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:35:48,255 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:35:48,290 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,297 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,303 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,310 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,316 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,326 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,334 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,345 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,357 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,368 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,377 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,387 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,399 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,408 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,420 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,429 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,438 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,451 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,464 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:48,465 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:48,474 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:48,676 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 2797 proven. 156 refuted. 0 times theorem prover too weak. 10819 trivial. 0 not checked. [2018-01-21 10:35:48,676 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:49,242 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 2797 proven. 156 refuted. 0 times theorem prover too weak. 10819 trivial. 0 not checked. [2018-01-21 10:35:49,262 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:49,263 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 10:35:49,265 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:35:49,266 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:35:49,297 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:49,310 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:49,341 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:49,379 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:49,442 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:49,642 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:50,583 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:54,291 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:36:06,330 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... [2018-01-21 10:36:18,388 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown