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_precise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/memsetNonZero3_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:08:35,607 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:08:35,609 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:08:35,622 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:08:35,623 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:08:35,624 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:08:35,625 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:08:35,626 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:08:35,628 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:08:35,628 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:08:35,629 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:08:35,629 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:08:35,630 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:08:35,632 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:08:35,633 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:08:35,636 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:08:35,638 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:08:35,640 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:08:35,642 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:08:35,643 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:08:35,646 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 06:08:35,651 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:08:35,652 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:08:35,652 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_precise.epf [2018-01-21 06:08:35,662 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:08:35,662 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:08:35,663 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:08:35,663 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:08:35,664 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:08:35,664 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:08:35,664 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:08:35,664 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:08:35,665 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:08:35,665 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:08:35,665 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:08:35,665 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:08:35,666 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:08:35,666 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:08:35,666 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:08:35,666 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:08:35,666 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:08:35,667 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:08:35,667 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:08:35,667 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:08:35,667 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:08:35,667 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:08:35,668 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:08:35,668 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:08:35,668 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:08:35,668 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:08:35,668 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:08:35,669 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:08:35,669 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:08:35,669 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:08:35,669 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:08:35,669 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:08:35,670 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:08:35,670 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:08:35,670 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:08:35,670 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:08:35,670 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:08:35,671 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:08:35,671 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:08:35,707 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:08:35,721 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:08:35,725 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:08:35,727 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:08:35,727 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:08:35,728 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/memsetNonZero3_true-valid-memsafety_true-termination.c [2018-01-21 06:08:35,838 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:08:35,844 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:08:35,845 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:08:35,845 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:08:35,850 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:08:35,851 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:08:35" (1/1) ... [2018-01-21 06:08:35,854 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31c08721 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:35, skipping insertion in model container [2018-01-21 06:08:35,854 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:08:35" (1/1) ... [2018-01-21 06:08:35,875 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:08:35,896 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:08:36,020 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:08:36,035 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:08:36,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36 WrapperNode [2018-01-21 06:08:36,041 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:08:36,042 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:08:36,042 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:08:36,042 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:08:36,059 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36" (1/1) ... [2018-01-21 06:08:36,059 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36" (1/1) ... [2018-01-21 06:08:36,070 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36" (1/1) ... [2018-01-21 06:08:36,070 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36" (1/1) ... [2018-01-21 06:08:36,072 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36" (1/1) ... [2018-01-21 06:08:36,075 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36" (1/1) ... [2018-01-21 06:08:36,076 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36" (1/1) ... [2018-01-21 06:08:36,077 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:08:36,078 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:08:36,078 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:08:36,078 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:08:36,079 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36" (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 06:08:36,129 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:08:36,130 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:08:36,130 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:08:36,130 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:08:36,130 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:08:36,130 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:08:36,130 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2018-01-21 06:08:36,130 INFO L136 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2018-01-21 06:08:36,131 INFO L128 BoogieDeclarations]: Found specification of procedure memset [2018-01-21 06:08:36,131 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:08:36,131 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:08:36,131 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:08:36,253 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:08:36,254 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:08:36 BoogieIcfgContainer [2018-01-21 06:08:36,254 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:08:36,255 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:08:36,255 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:08:36,257 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:08:36,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:08:35" (1/3) ... [2018-01-21 06:08:36,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78cf0040 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:08:36, skipping insertion in model container [2018-01-21 06:08:36,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:08:36" (2/3) ... [2018-01-21 06:08:36,259 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78cf0040 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:08:36, skipping insertion in model container [2018-01-21 06:08:36,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:08:36" (3/3) ... [2018-01-21 06:08:36,261 INFO L105 eAbstractionObserver]: Analyzing ICFG memsetNonZero3_true-valid-memsafety_true-termination.c [2018-01-21 06:08:36,268 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:08:36,273 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 06:08:36,306 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:08:36,306 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:08:36,306 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:08:36,307 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:08:36,307 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:08:36,307 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:08:36,307 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:08:36,307 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:08:36,308 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:08:36,323 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 06:08:36,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:08:36,329 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:36,330 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:08:36,330 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:08:36,336 INFO L82 PathProgramCache]: Analyzing trace with hash 51896, now seen corresponding path program 1 times [2018-01-21 06:08:36,339 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:36,388 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:36,388 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:36,388 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:36,388 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:36,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:08:36,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:08:36,446 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:08:36,453 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:08:36,459 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:08:36,459 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:08:36,459 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:08:36,459 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:08:36,459 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:08:36,459 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:08:36,460 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:08:36,460 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:08:36,460 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:08:36,461 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 06:08:36,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-21 06:08:36,462 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:36,463 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:36,463 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:36,463 INFO L82 PathProgramCache]: Analyzing trace with hash 126067280, now seen corresponding path program 1 times [2018-01-21 06:08:36,463 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:36,465 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:36,465 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:36,465 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:36,465 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:36,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:36,501 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:36,609 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 06:08:36,610 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:08:36,611 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 06:08:36,611 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:08:36,613 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 06:08:36,628 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 06:08:36,629 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 06:08:36,631 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2018-01-21 06:08:36,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:36,692 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-21 06:08:36,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 06:08:36,693 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2018-01-21 06:08:36,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:36,702 INFO L225 Difference]: With dead ends: 34 [2018-01-21 06:08:36,702 INFO L226 Difference]: Without dead ends: 20 [2018-01-21 06:08:36,764 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:08:36,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-01-21 06:08:36,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-01-21 06:08:36,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-01-21 06:08:36,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-01-21 06:08:36,803 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-01-21 06:08:36,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:36,836 INFO L432 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-01-21 06:08:36,836 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 06:08:36,836 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-01-21 06:08:36,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:08:36,836 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:36,837 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 06:08:36,837 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:36,837 INFO L82 PathProgramCache]: Analyzing trace with hash 763300235, now seen corresponding path program 1 times [2018-01-21 06:08:36,837 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:36,838 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:36,838 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:36,838 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:36,838 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:36,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:36,854 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:36,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:36,931 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:36,932 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:36,933 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-01-21 06:08:36,935 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [9], [10], [14], [15], [16], [18], [19], [20], [21], [23], [24], [25], [26], [27], [28] [2018-01-21 06:08:36,979 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:08:36,979 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:08:37,911 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:08:37,913 INFO L268 AbstractInterpreter]: Visited 19 different actions 23 times. Merged at 3 different actions 3 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 15 variables. [2018-01-21 06:08:37,925 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:08:37,926 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:37,926 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 06:08:37,938 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:37,938 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:37,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:37,971 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:38,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:38,054 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:38,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:38,261 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:38,261 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:38,266 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:38,266 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:38,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:38,293 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:38,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:38,299 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:38,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:38,426 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:38,426 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 11 [2018-01-21 06:08:38,426 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:38,428 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 06:08:38,428 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 06:08:38,428 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-01-21 06:08:38,428 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 8 states. [2018-01-21 06:08:38,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:38,476 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-01-21 06:08:38,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:08:38,476 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2018-01-21 06:08:38,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:38,477 INFO L225 Difference]: With dead ends: 30 [2018-01-21 06:08:38,478 INFO L226 Difference]: Without dead ends: 21 [2018-01-21 06:08:38,479 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2018-01-21 06:08:38,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-01-21 06:08:38,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-01-21 06:08:38,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-01-21 06:08:38,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-01-21 06:08:38,483 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-01-21 06:08:38,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:38,483 INFO L432 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-01-21 06:08:38,483 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 06:08:38,483 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-01-21 06:08:38,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 06:08:38,485 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:38,485 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:38,485 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:38,485 INFO L82 PathProgramCache]: Analyzing trace with hash -957314640, now seen corresponding path program 2 times [2018-01-21 06:08:38,485 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:38,487 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:38,487 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:38,487 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:38,487 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:38,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:38,501 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:38,578 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:38,579 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:38,579 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:38,579 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:38,579 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:38,579 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:38,579 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:38,596 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:38,596 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:38,610 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:38,614 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:38,615 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:38,617 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:38,672 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:38,672 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:38,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:38,820 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:38,820 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:38,824 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:38,825 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:38,840 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:38,851 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:38,858 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:38,861 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:38,867 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:38,867 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:38,954 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:38,957 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:38,957 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 14 [2018-01-21 06:08:38,957 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:38,957 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:08:38,958 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:08:38,958 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=113, Unknown=0, NotChecked=0, Total=182 [2018-01-21 06:08:38,958 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 10 states. [2018-01-21 06:08:39,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:39,000 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-01-21 06:08:39,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 06:08:39,001 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2018-01-21 06:08:39,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:39,001 INFO L225 Difference]: With dead ends: 31 [2018-01-21 06:08:39,001 INFO L226 Difference]: Without dead ends: 22 [2018-01-21 06:08:39,002 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2018-01-21 06:08:39,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-01-21 06:08:39,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-01-21 06:08:39,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-01-21 06:08:39,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-01-21 06:08:39,006 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-01-21 06:08:39,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:39,006 INFO L432 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-01-21 06:08:39,006 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:08:39,006 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-01-21 06:08:39,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-21 06:08:39,007 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:39,007 INFO L322 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:39,007 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:39,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1538199083, now seen corresponding path program 3 times [2018-01-21 06:08:39,008 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:39,009 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:39,009 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:39,009 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:39,009 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:39,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:39,024 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:39,091 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,092 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:39,092 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:39,092 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:39,092 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:39,092 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:39,092 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:39,097 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:39,097 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:39,106 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:39,108 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:39,109 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:39,109 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:39,111 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:39,141 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,141 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:39,264 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,285 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:39,285 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:39,288 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:39,288 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:39,302 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:39,310 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:39,318 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:39,324 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:39,327 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:39,331 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,331 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:39,376 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,378 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:39,378 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 17 [2018-01-21 06:08:39,378 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:39,378 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 06:08:39,379 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 06:08:39,379 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:08:39,379 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 12 states. [2018-01-21 06:08:39,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:39,409 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-01-21 06:08:39,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 06:08:39,409 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2018-01-21 06:08:39,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:39,410 INFO L225 Difference]: With dead ends: 32 [2018-01-21 06:08:39,410 INFO L226 Difference]: Without dead ends: 23 [2018-01-21 06:08:39,411 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=191, Unknown=0, NotChecked=0, Total=306 [2018-01-21 06:08:39,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-01-21 06:08:39,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-01-21 06:08:39,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-01-21 06:08:39,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-01-21 06:08:39,414 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-01-21 06:08:39,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:39,415 INFO L432 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-01-21 06:08:39,415 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 06:08:39,415 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-01-21 06:08:39,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 06:08:39,416 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:39,416 INFO L322 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:39,416 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:39,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1589713168, now seen corresponding path program 4 times [2018-01-21 06:08:39,416 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:39,417 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:39,417 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:39,418 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:39,418 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:39,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:39,432 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:39,478 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,479 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:39,479 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:39,479 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:39,479 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:39,479 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:39,479 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:39,484 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:39,484 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:39,496 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:39,498 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:39,533 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,534 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:39,641 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,661 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:39,662 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:39,664 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:39,664 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:39,688 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:39,691 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:39,696 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,697 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:39,765 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,766 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:39,766 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-21 06:08:39,766 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:39,767 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 06:08:39,767 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 06:08:39,767 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=239, Unknown=0, NotChecked=0, Total=380 [2018-01-21 06:08:39,768 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 14 states. [2018-01-21 06:08:39,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:39,794 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-01-21 06:08:39,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 06:08:39,795 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 22 [2018-01-21 06:08:39,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:39,795 INFO L225 Difference]: With dead ends: 33 [2018-01-21 06:08:39,795 INFO L226 Difference]: Without dead ends: 24 [2018-01-21 06:08:39,796 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=156, Invalid=264, Unknown=0, NotChecked=0, Total=420 [2018-01-21 06:08:39,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-01-21 06:08:39,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-01-21 06:08:39,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-01-21 06:08:39,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-01-21 06:08:39,798 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-01-21 06:08:39,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:39,799 INFO L432 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-01-21 06:08:39,799 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 06:08:39,799 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-01-21 06:08:39,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-01-21 06:08:39,799 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:39,799 INFO L322 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:39,799 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:39,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1108317493, now seen corresponding path program 5 times [2018-01-21 06:08:39,800 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:39,800 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:39,800 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:39,800 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:39,801 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:39,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:39,813 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:39,876 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:39,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:39,877 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:39,877 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:39,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:39,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:39,882 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:39,882 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:39,887 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:39,888 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:39,888 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:39,892 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:39,894 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:39,895 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:39,965 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:39,965 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:40,094 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,115 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:40,115 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:40,118 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:40,118 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:40,122 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:40,125 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:40,130 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:40,142 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:40,149 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:40,152 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:40,157 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,158 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:40,216 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,217 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:40,217 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-21 06:08:40,217 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:40,217 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 06:08:40,218 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 06:08:40,218 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=320, Unknown=0, NotChecked=0, Total=506 [2018-01-21 06:08:40,218 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2018-01-21 06:08:40,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:40,247 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-21 06:08:40,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 06:08:40,248 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2018-01-21 06:08:40,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:40,248 INFO L225 Difference]: With dead ends: 34 [2018-01-21 06:08:40,248 INFO L226 Difference]: Without dead ends: 25 [2018-01-21 06:08:40,249 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2018-01-21 06:08:40,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-01-21 06:08:40,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-01-21 06:08:40,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-01-21 06:08:40,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-01-21 06:08:40,252 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-01-21 06:08:40,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:40,252 INFO L432 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-01-21 06:08:40,252 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 06:08:40,252 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-01-21 06:08:40,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 06:08:40,253 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:40,253 INFO L322 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:40,253 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:40,253 INFO L82 PathProgramCache]: Analyzing trace with hash 1152077936, now seen corresponding path program 6 times [2018-01-21 06:08:40,253 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:40,254 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:40,254 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:40,254 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:40,255 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:40,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:40,263 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:40,346 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,346 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:40,346 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:40,346 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:40,346 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:40,346 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:40,346 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:40,351 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:40,352 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:40,359 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:40,360 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:40,362 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:40,363 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:40,363 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:40,365 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:40,427 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,427 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:40,578 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,599 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:40,599 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:40,602 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:40,602 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:40,615 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:40,626 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:40,639 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:40,652 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:40,662 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:40,666 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:40,671 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,672 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:40,741 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,743 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:40,743 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 26 [2018-01-21 06:08:40,743 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:40,744 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 06:08:40,744 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 06:08:40,744 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=413, Unknown=0, NotChecked=0, Total=650 [2018-01-21 06:08:40,744 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 18 states. [2018-01-21 06:08:40,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:40,815 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-01-21 06:08:40,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 06:08:40,815 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2018-01-21 06:08:40,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:40,816 INFO L225 Difference]: With dead ends: 35 [2018-01-21 06:08:40,816 INFO L226 Difference]: Without dead ends: 26 [2018-01-21 06:08:40,816 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=256, Invalid=446, Unknown=0, NotChecked=0, Total=702 [2018-01-21 06:08:40,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-01-21 06:08:40,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-01-21 06:08:40,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-01-21 06:08:40,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-01-21 06:08:40,819 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-01-21 06:08:40,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:40,819 INFO L432 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-01-21 06:08:40,819 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 06:08:40,819 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-01-21 06:08:40,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-21 06:08:40,820 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:40,820 INFO L322 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:40,820 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:40,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1790107797, now seen corresponding path program 7 times [2018-01-21 06:08:40,820 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:40,821 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:40,821 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:40,821 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:40,821 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:40,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:40,833 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:40,924 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,924 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:40,924 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:40,924 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:40,924 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:40,924 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:40,924 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:40,930 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:40,930 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:40,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:40,940 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:40,987 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:40,988 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:41,174 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:41,194 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:41,194 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:41,197 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:41,197 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:41,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:41,218 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:41,225 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:41,225 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:41,288 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:41,289 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:41,289 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-21 06:08:41,289 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:41,290 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 06:08:41,290 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 06:08:41,291 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=518, Unknown=0, NotChecked=0, Total=812 [2018-01-21 06:08:41,291 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 20 states. [2018-01-21 06:08:41,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:41,335 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-01-21 06:08:41,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 06:08:41,335 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 25 [2018-01-21 06:08:41,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:41,336 INFO L225 Difference]: With dead ends: 36 [2018-01-21 06:08:41,336 INFO L226 Difference]: Without dead ends: 27 [2018-01-21 06:08:41,337 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=315, Invalid=555, Unknown=0, NotChecked=0, Total=870 [2018-01-21 06:08:41,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-01-21 06:08:41,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-01-21 06:08:41,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-01-21 06:08:41,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-01-21 06:08:41,341 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-01-21 06:08:41,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:41,341 INFO L432 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-01-21 06:08:41,341 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 06:08:41,341 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-01-21 06:08:41,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-21 06:08:41,342 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:41,342 INFO L322 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:41,342 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:41,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1491414992, now seen corresponding path program 8 times [2018-01-21 06:08:41,343 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:41,344 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:41,344 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:41,344 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:41,344 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:41,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:41,354 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:41,551 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:41,551 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:41,551 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:41,552 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:41,552 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:41,552 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:41,552 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:41,561 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:41,561 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:41,568 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:41,573 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:41,574 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:41,575 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:41,640 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:41,640 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:41,849 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:41,889 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:41,889 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:41,892 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:41,892 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:41,904 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:41,913 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:41,921 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:41,924 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:41,928 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:41,928 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:42,009 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:42,010 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:42,011 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-21 06:08:42,011 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:42,011 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 06:08:42,011 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 06:08:42,012 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=635, Unknown=0, NotChecked=0, Total=992 [2018-01-21 06:08:42,012 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 22 states. [2018-01-21 06:08:42,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:42,038 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-01-21 06:08:42,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 06:08:42,039 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 26 [2018-01-21 06:08:42,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:42,039 INFO L225 Difference]: With dead ends: 37 [2018-01-21 06:08:42,039 INFO L226 Difference]: Without dead ends: 28 [2018-01-21 06:08:42,040 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=676, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 06:08:42,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-01-21 06:08:42,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-01-21 06:08:42,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-01-21 06:08:42,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-01-21 06:08:42,043 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-01-21 06:08:42,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:42,043 INFO L432 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-01-21 06:08:42,043 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 06:08:42,043 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-01-21 06:08:42,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 06:08:42,044 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:42,044 INFO L322 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:42,044 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:42,044 INFO L82 PathProgramCache]: Analyzing trace with hash 139406347, now seen corresponding path program 9 times [2018-01-21 06:08:42,044 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:42,045 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:42,045 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:42,045 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:42,045 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:42,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:42,054 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:42,174 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:42,175 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:42,175 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:42,175 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:42,175 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:42,175 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:42,175 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:42,180 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:42,180 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:42,187 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,189 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,190 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,191 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,192 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,193 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,193 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:42,195 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:42,260 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:42,261 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:42,470 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:42,491 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:42,491 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:42,494 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:42,494 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:42,503 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,510 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,518 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,527 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,536 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,545 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:42,552 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:42,554 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:42,559 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:42,559 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:42,634 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:42,635 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:42,635 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 35 [2018-01-21 06:08:42,635 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:42,636 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 06:08:42,636 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 06:08:42,636 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=764, Unknown=0, NotChecked=0, Total=1190 [2018-01-21 06:08:42,636 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 24 states. [2018-01-21 06:08:42,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:42,675 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-01-21 06:08:42,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 06:08:42,675 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 27 [2018-01-21 06:08:42,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:42,675 INFO L225 Difference]: With dead ends: 38 [2018-01-21 06:08:42,676 INFO L226 Difference]: Without dead ends: 29 [2018-01-21 06:08:42,676 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=451, Invalid=809, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 06:08:42,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-01-21 06:08:42,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-01-21 06:08:42,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-01-21 06:08:42,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-01-21 06:08:42,679 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-01-21 06:08:42,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:42,679 INFO L432 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-01-21 06:08:42,679 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 06:08:42,679 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-01-21 06:08:42,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 06:08:42,679 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:42,680 INFO L322 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:42,680 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:42,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1176811312, now seen corresponding path program 10 times [2018-01-21 06:08:42,680 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:42,680 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:42,680 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:42,681 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:42,681 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:42,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:42,691 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:42,807 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:42,807 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:42,807 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:42,807 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:42,807 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:42,807 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:42,807 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:42,816 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:42,816 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:42,830 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:42,831 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:42,938 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:42,938 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:43,180 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:43,200 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:43,201 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:43,204 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:43,204 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:43,229 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:43,232 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:43,237 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:43,237 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:43,321 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:43,322 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:43,322 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-21 06:08:43,323 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:43,323 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 06:08:43,323 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 06:08:43,323 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=905, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 06:08:43,323 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 26 states. [2018-01-21 06:08:43,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:43,351 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-01-21 06:08:43,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 06:08:43,352 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2018-01-21 06:08:43,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:43,352 INFO L225 Difference]: With dead ends: 39 [2018-01-21 06:08:43,352 INFO L226 Difference]: Without dead ends: 30 [2018-01-21 06:08:43,353 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=528, Invalid=954, Unknown=0, NotChecked=0, Total=1482 [2018-01-21 06:08:43,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-01-21 06:08:43,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-01-21 06:08:43,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-01-21 06:08:43,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-01-21 06:08:43,355 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-01-21 06:08:43,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:43,355 INFO L432 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-01-21 06:08:43,355 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 06:08:43,356 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-01-21 06:08:43,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-21 06:08:43,356 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:43,356 INFO L322 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:43,356 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:43,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1023373141, now seen corresponding path program 11 times [2018-01-21 06:08:43,356 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:43,357 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:43,357 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:43,357 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:43,357 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:43,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:43,366 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:43,471 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:43,471 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:43,472 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:43,472 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:43,472 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:43,472 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:43,472 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:43,477 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:43,477 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:43,480 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,481 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,482 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,483 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,484 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,485 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,489 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,490 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:43,491 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:43,566 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:43,567 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:43,857 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:43,878 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:43,878 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:43,883 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:43,883 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:43,887 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,889 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,893 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,896 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,901 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,905 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,917 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:43,924 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:43,928 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:43,934 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:43,935 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:44,014 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:44,016 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:44,016 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-21 06:08:44,016 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:44,016 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 06:08:44,016 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 06:08:44,017 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=1058, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 06:08:44,017 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 28 states. [2018-01-21 06:08:44,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:44,063 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-01-21 06:08:44,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 06:08:44,064 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 29 [2018-01-21 06:08:44,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:44,065 INFO L225 Difference]: With dead ends: 40 [2018-01-21 06:08:44,065 INFO L226 Difference]: Without dead ends: 31 [2018-01-21 06:08:44,065 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=611, Invalid=1111, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 06:08:44,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-01-21 06:08:44,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-01-21 06:08:44,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-01-21 06:08:44,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-01-21 06:08:44,069 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-01-21 06:08:44,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:44,070 INFO L432 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-01-21 06:08:44,070 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 06:08:44,070 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-01-21 06:08:44,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 06:08:44,070 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:44,071 INFO L322 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:44,071 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:44,071 INFO L82 PathProgramCache]: Analyzing trace with hash -509614448, now seen corresponding path program 12 times [2018-01-21 06:08:44,071 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:44,072 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:44,072 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:44,072 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:44,072 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:44,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:44,082 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:44,279 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:44,279 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:44,279 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:44,280 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:44,280 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:44,280 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:44,280 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:44,285 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:44,285 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:44,298 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,300 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,301 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,302 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,303 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,304 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,305 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,305 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:44,307 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:44,390 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:44,390 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:44,760 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:44,793 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:44,793 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:44,796 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:44,796 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:44,808 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,818 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,830 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,842 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,851 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,861 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,871 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:44,878 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:44,881 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:44,886 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:44,886 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:45,022 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:45,024 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:45,024 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 44 [2018-01-21 06:08:45,024 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:45,025 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 06:08:45,025 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 06:08:45,025 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=1223, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 06:08:45,026 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-01-21 06:08:45,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:45,132 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-01-21 06:08:45,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-01-21 06:08:45,133 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-01-21 06:08:45,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:45,134 INFO L225 Difference]: With dead ends: 41 [2018-01-21 06:08:45,134 INFO L226 Difference]: Without dead ends: 32 [2018-01-21 06:08:45,134 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=700, Invalid=1280, Unknown=0, NotChecked=0, Total=1980 [2018-01-21 06:08:45,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-01-21 06:08:45,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-01-21 06:08:45,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-01-21 06:08:45,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-01-21 06:08:45,138 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-01-21 06:08:45,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:45,138 INFO L432 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-01-21 06:08:45,138 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 06:08:45,138 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-01-21 06:08:45,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 06:08:45,139 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:45,139 INFO L322 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:45,139 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:45,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1762964149, now seen corresponding path program 13 times [2018-01-21 06:08:45,140 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:45,141 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:45,141 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:45,141 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:45,141 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:45,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:45,149 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:45,302 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:45,303 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:45,303 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:45,303 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:45,303 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:45,303 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:45,303 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:45,312 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:45,312 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:45,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:45,325 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:45,471 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:45,471 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:45,854 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:45,886 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:45,887 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:45,890 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:45,890 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:45,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:45,922 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:45,926 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:45,926 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:46,039 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:46,040 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:46,040 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-21 06:08:46,040 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:46,041 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 06:08:46,041 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 06:08:46,041 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=1400, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 06:08:46,042 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 32 states. [2018-01-21 06:08:46,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:46,081 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-01-21 06:08:46,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 06:08:46,081 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 31 [2018-01-21 06:08:46,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:46,082 INFO L225 Difference]: With dead ends: 42 [2018-01-21 06:08:46,082 INFO L226 Difference]: Without dead ends: 33 [2018-01-21 06:08:46,083 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=795, Invalid=1461, Unknown=0, NotChecked=0, Total=2256 [2018-01-21 06:08:46,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-01-21 06:08:46,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-01-21 06:08:46,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-01-21 06:08:46,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-01-21 06:08:46,087 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-01-21 06:08:46,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:46,087 INFO L432 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-01-21 06:08:46,087 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 06:08:46,087 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-01-21 06:08:46,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 06:08:46,088 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:46,088 INFO L322 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:46,088 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:46,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1962099216, now seen corresponding path program 14 times [2018-01-21 06:08:46,088 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:46,089 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:46,089 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:46,089 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:46,089 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:46,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:46,097 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:46,347 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:46,347 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:46,348 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:46,348 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:46,348 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:46,348 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:46,348 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:46,363 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:46,363 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:46,372 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:46,378 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:46,380 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:46,382 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:46,795 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:46,795 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:47,308 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:47,328 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:47,328 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:47,331 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:47,331 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:47,340 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:47,350 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:47,359 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:47,362 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:47,366 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:47,366 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:47,473 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:47,474 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:47,474 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-21 06:08:47,474 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:47,475 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 06:08:47,475 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 06:08:47,476 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=1589, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 06:08:47,476 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 34 states. [2018-01-21 06:08:47,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:47,587 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-01-21 06:08:47,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 06:08:47,588 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 32 [2018-01-21 06:08:47,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:47,588 INFO L225 Difference]: With dead ends: 43 [2018-01-21 06:08:47,588 INFO L226 Difference]: Without dead ends: 34 [2018-01-21 06:08:47,589 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=896, Invalid=1654, Unknown=0, NotChecked=0, Total=2550 [2018-01-21 06:08:47,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-01-21 06:08:47,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-01-21 06:08:47,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-01-21 06:08:47,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-01-21 06:08:47,593 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-01-21 06:08:47,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:47,594 INFO L432 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-01-21 06:08:47,594 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 06:08:47,594 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-01-21 06:08:47,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 06:08:47,594 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:47,595 INFO L322 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:47,595 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:47,595 INFO L82 PathProgramCache]: Analyzing trace with hash 454648299, now seen corresponding path program 15 times [2018-01-21 06:08:47,595 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:47,596 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:47,596 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:47,596 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:47,596 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:47,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:47,604 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:48,192 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:48,192 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:48,192 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:48,192 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:48,192 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:48,192 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:48,192 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:48,203 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:48,203 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:48,210 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,212 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,214 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,215 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,216 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,218 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,219 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,220 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,221 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,222 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:48,223 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:48,354 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:48,354 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:48,939 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:48,959 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:48,959 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:48,962 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:48,962 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:48,974 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,981 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,989 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:48,997 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:49,006 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:49,015 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:49,024 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:49,033 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:49,043 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:49,051 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:49,054 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:49,058 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:49,058 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:49,178 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:49,179 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:49,179 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 53 [2018-01-21 06:08:49,179 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:49,179 INFO L409 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-01-21 06:08:49,180 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-01-21 06:08:49,180 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=966, Invalid=1790, Unknown=0, NotChecked=0, Total=2756 [2018-01-21 06:08:49,181 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 36 states. [2018-01-21 06:08:49,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:49,216 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-01-21 06:08:49,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-01-21 06:08:49,216 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 33 [2018-01-21 06:08:49,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:49,217 INFO L225 Difference]: With dead ends: 44 [2018-01-21 06:08:49,217 INFO L226 Difference]: Without dead ends: 35 [2018-01-21 06:08:49,218 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1123 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1003, Invalid=1859, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 06:08:49,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-01-21 06:08:49,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-01-21 06:08:49,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-01-21 06:08:49,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-01-21 06:08:49,221 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-01-21 06:08:49,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:49,221 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-01-21 06:08:49,222 INFO L433 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-01-21 06:08:49,222 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-01-21 06:08:49,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 06:08:49,222 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:49,222 INFO L322 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:49,223 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:49,223 INFO L82 PathProgramCache]: Analyzing trace with hash -1935590064, now seen corresponding path program 16 times [2018-01-21 06:08:49,223 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:49,224 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:49,224 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:49,224 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:49,224 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:49,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:49,232 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:49,475 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:49,475 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:49,475 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:49,475 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:49,475 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:49,475 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:49,475 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:49,480 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:49,480 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:49,491 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:49,493 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:49,616 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:49,616 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:50,069 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:50,089 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:50,089 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:50,092 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:50,092 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:50,122 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:50,125 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:50,130 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:50,130 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:50,253 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:50,254 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:50,254 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 56 [2018-01-21 06:08:50,255 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:50,255 INFO L409 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-01-21 06:08:50,255 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-01-21 06:08:50,256 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1077, Invalid=2003, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 06:08:50,256 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 38 states. [2018-01-21 06:08:50,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:50,365 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-01-21 06:08:50,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 06:08:50,366 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 34 [2018-01-21 06:08:50,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:50,366 INFO L225 Difference]: With dead ends: 45 [2018-01-21 06:08:50,366 INFO L226 Difference]: Without dead ends: 36 [2018-01-21 06:08:50,367 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1116, Invalid=2076, Unknown=0, NotChecked=0, Total=3192 [2018-01-21 06:08:50,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-21 06:08:50,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-21 06:08:50,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-21 06:08:50,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-01-21 06:08:50,370 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-01-21 06:08:50,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:50,371 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-01-21 06:08:50,371 INFO L433 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-01-21 06:08:50,371 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-01-21 06:08:50,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-21 06:08:50,371 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:50,372 INFO L322 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:50,372 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:50,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1276432011, now seen corresponding path program 17 times [2018-01-21 06:08:50,372 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:50,372 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:50,372 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:50,373 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:50,373 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:50,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:50,379 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:50,573 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:50,573 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:50,573 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:50,574 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:50,574 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:50,574 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:50,574 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:50,581 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:50,582 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:50,585 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,586 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,586 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,587 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,588 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,589 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,589 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,590 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,591 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,595 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:50,596 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:50,598 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:50,735 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:50,735 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:51,310 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:51,330 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:51,330 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 35 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:51,333 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:51,333 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:51,337 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,339 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,342 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,346 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,350 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,354 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,359 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,364 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,369 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,380 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:51,389 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:51,391 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:51,396 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:51,396 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:51,520 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:51,521 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:51,521 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 59 [2018-01-21 06:08:51,521 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:51,521 INFO L409 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-01-21 06:08:51,521 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-01-21 06:08:51,522 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2228, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 06:08:51,522 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 40 states. [2018-01-21 06:08:51,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:51,564 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-01-21 06:08:51,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 06:08:51,564 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 35 [2018-01-21 06:08:51,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:51,564 INFO L225 Difference]: With dead ends: 46 [2018-01-21 06:08:51,565 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 06:08:51,565 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1235, Invalid=2305, Unknown=0, NotChecked=0, Total=3540 [2018-01-21 06:08:51,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 06:08:51,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 06:08:51,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 06:08:51,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-01-21 06:08:51,569 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-01-21 06:08:51,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:51,570 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-01-21 06:08:51,570 INFO L433 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-01-21 06:08:51,570 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-01-21 06:08:51,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 06:08:51,571 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:51,571 INFO L322 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:51,571 INFO L371 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:51,571 INFO L82 PathProgramCache]: Analyzing trace with hash 2064868528, now seen corresponding path program 18 times [2018-01-21 06:08:51,571 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:51,572 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:51,572 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:51,572 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:51,572 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:51,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:51,580 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:51,756 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:51,756 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:51,757 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:51,757 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:51,757 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:51,757 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:51,757 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:51,763 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:51,763 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:51,770 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,772 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,773 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,774 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,775 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,776 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,777 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,778 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,780 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,781 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:51,781 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:51,782 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:51,931 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:51,935 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:52,491 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:52,511 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:52,511 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 37 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:52,514 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:52,514 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:52,523 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,530 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,538 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,546 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,554 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,563 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,573 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,583 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,593 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,604 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:52,612 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:52,616 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:52,621 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:52,621 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:52,750 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:52,751 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:52,751 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 62 [2018-01-21 06:08:52,751 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:52,751 INFO L409 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-01-21 06:08:52,752 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-01-21 06:08:52,752 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1317, Invalid=2465, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 06:08:52,752 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 42 states. [2018-01-21 06:08:52,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:52,811 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-01-21 06:08:52,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 06:08:52,811 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 36 [2018-01-21 06:08:52,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:52,812 INFO L225 Difference]: With dead ends: 47 [2018-01-21 06:08:52,812 INFO L226 Difference]: Without dead ends: 38 [2018-01-21 06:08:52,813 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1360, Invalid=2546, Unknown=0, NotChecked=0, Total=3906 [2018-01-21 06:08:52,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-01-21 06:08:52,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-01-21 06:08:52,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 06:08:52,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-01-21 06:08:52,815 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-01-21 06:08:52,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:52,816 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-01-21 06:08:52,816 INFO L433 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-01-21 06:08:52,816 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-01-21 06:08:52,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 06:08:52,816 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:52,817 INFO L322 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:52,817 INFO L371 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:52,817 INFO L82 PathProgramCache]: Analyzing trace with hash 736596779, now seen corresponding path program 19 times [2018-01-21 06:08:52,817 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:52,818 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:52,818 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:52,818 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:52,818 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:52,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:52,826 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:53,050 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:53,050 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:53,050 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:53,050 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:53,051 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:53,051 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:53,051 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:53,055 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:53,056 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:53,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:53,068 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:53,220 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:53,221 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:53,811 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:53,831 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:53,831 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 39 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:53,834 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:53,834 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:53,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:53,862 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:53,867 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:53,867 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:54,016 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:54,016 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:54,017 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 65 [2018-01-21 06:08:54,017 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:54,017 INFO L409 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-01-21 06:08:54,017 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-01-21 06:08:54,018 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1446, Invalid=2714, Unknown=0, NotChecked=0, Total=4160 [2018-01-21 06:08:54,018 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 44 states. [2018-01-21 06:08:54,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:54,060 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-01-21 06:08:54,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 06:08:54,060 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 37 [2018-01-21 06:08:54,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:54,061 INFO L225 Difference]: With dead ends: 48 [2018-01-21 06:08:54,061 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 06:08:54,061 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1491, Invalid=2799, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 06:08:54,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 06:08:54,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 06:08:54,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 06:08:54,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-01-21 06:08:54,064 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-01-21 06:08:54,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:54,064 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-01-21 06:08:54,064 INFO L433 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-01-21 06:08:54,064 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-01-21 06:08:54,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-01-21 06:08:54,065 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:54,065 INFO L322 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:54,065 INFO L371 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:54,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1785121776, now seen corresponding path program 20 times [2018-01-21 06:08:54,065 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:54,065 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:54,065 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:54,066 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:54,066 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:54,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:54,072 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:54,286 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:54,286 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:54,286 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:54,286 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:54,286 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:54,287 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:54,287 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:54,291 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:54,291 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:54,298 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:54,303 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:54,304 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:54,306 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:54,476 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:54,476 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:55,129 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:55,149 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:55,149 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 41 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:55,152 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:55,152 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:55,162 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:55,174 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:55,184 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:55,187 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:55,193 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:55,193 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:55,340 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:55,341 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:55,341 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 68 [2018-01-21 06:08:55,341 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:55,341 INFO L409 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-01-21 06:08:55,341 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-01-21 06:08:55,342 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1581, Invalid=2975, Unknown=0, NotChecked=0, Total=4556 [2018-01-21 06:08:55,342 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 46 states. [2018-01-21 06:08:55,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:55,387 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-01-21 06:08:55,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 06:08:55,388 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 38 [2018-01-21 06:08:55,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:55,388 INFO L225 Difference]: With dead ends: 49 [2018-01-21 06:08:55,388 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 06:08:55,389 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1898 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1628, Invalid=3064, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 06:08:55,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 06:08:55,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 06:08:55,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 06:08:55,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-01-21 06:08:55,392 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-01-21 06:08:55,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:55,392 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-01-21 06:08:55,392 INFO L433 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-01-21 06:08:55,392 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-01-21 06:08:55,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 06:08:55,393 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:55,393 INFO L322 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:55,393 INFO L371 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:55,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1645981643, now seen corresponding path program 21 times [2018-01-21 06:08:55,393 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:55,394 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:55,394 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:55,394 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:55,395 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:55,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:55,402 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:55,652 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:55,652 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:55,652 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:55,652 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:55,652 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:55,652 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:55,652 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:55,657 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:55,657 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:55,664 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,665 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,666 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,667 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,668 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,669 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,670 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,671 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,672 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,673 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,674 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,675 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:55,676 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:55,677 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:55,854 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:55,855 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:56,549 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:56,570 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:56,570 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 43 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:56,573 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:56,573 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:56,582 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,589 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,597 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,605 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,614 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,623 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,633 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,642 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,653 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,663 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,674 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,686 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:56,694 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:56,698 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:56,705 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:56,705 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:56,862 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:56,863 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:56,864 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 71 [2018-01-21 06:08:56,864 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:56,864 INFO L409 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-01-21 06:08:56,864 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-01-21 06:08:56,865 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1722, Invalid=3248, Unknown=0, NotChecked=0, Total=4970 [2018-01-21 06:08:56,865 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 48 states. [2018-01-21 06:08:56,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:56,939 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-01-21 06:08:56,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 06:08:56,939 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 39 [2018-01-21 06:08:56,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:56,939 INFO L225 Difference]: With dead ends: 50 [2018-01-21 06:08:56,939 INFO L226 Difference]: Without dead ends: 41 [2018-01-21 06:08:56,940 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1771, Invalid=3341, Unknown=0, NotChecked=0, Total=5112 [2018-01-21 06:08:56,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-01-21 06:08:56,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-01-21 06:08:56,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 06:08:56,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-01-21 06:08:56,942 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-01-21 06:08:56,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:56,943 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-01-21 06:08:56,943 INFO L433 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-01-21 06:08:56,943 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-01-21 06:08:56,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-01-21 06:08:56,943 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:56,943 INFO L322 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:56,943 INFO L371 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:56,943 INFO L82 PathProgramCache]: Analyzing trace with hash 636005232, now seen corresponding path program 22 times [2018-01-21 06:08:56,944 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:56,944 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:56,944 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:56,944 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:56,944 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:56,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:56,953 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:57,233 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:57,233 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:57,233 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:57,233 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:57,233 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:57,233 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:57,234 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:57,238 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:57,239 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:57,251 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:57,253 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:57,447 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:57,447 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:58,227 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:58,246 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:58,247 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 45 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:58,250 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:58,250 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:58,284 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:58,287 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:58,293 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:58,293 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:58,469 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:58,470 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:58,470 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 74 [2018-01-21 06:08:58,470 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:58,470 INFO L409 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-01-21 06:08:58,470 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-01-21 06:08:58,471 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1869, Invalid=3533, Unknown=0, NotChecked=0, Total=5402 [2018-01-21 06:08:58,471 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 50 states. [2018-01-21 06:08:58,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:58,546 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-01-21 06:08:58,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 06:08:58,546 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 40 [2018-01-21 06:08:58,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:58,547 INFO L225 Difference]: With dead ends: 51 [2018-01-21 06:08:58,547 INFO L226 Difference]: Without dead ends: 42 [2018-01-21 06:08:58,547 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1920, Invalid=3630, Unknown=0, NotChecked=0, Total=5550 [2018-01-21 06:08:58,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-01-21 06:08:58,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-01-21 06:08:58,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-01-21 06:08:58,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-01-21 06:08:58,550 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-01-21 06:08:58,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:58,550 INFO L432 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-01-21 06:08:58,550 INFO L433 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-01-21 06:08:58,550 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-01-21 06:08:58,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 06:08:58,551 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:58,551 INFO L322 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:58,551 INFO L371 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:58,551 INFO L82 PathProgramCache]: Analyzing trace with hash -608492437, now seen corresponding path program 23 times [2018-01-21 06:08:58,551 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:58,551 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:58,552 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:58,552 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:58,552 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:58,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:58,560 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:58,933 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:58,933 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:58,933 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:58,933 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:58,933 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:58,934 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:58,934 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:08:58,938 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:58,938 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:58,942 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,943 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,944 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,945 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,945 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,946 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,947 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,948 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,949 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,949 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,950 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,951 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,956 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:58,957 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:58,958 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:59,169 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:08:59,169 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:59,980 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:00,000 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:00,000 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 47 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:00,003 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:09:00,003 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:09:00,007 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,009 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,012 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,015 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,019 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,023 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,028 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,033 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,038 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,044 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,050 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,057 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,069 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:00,079 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:00,082 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:00,089 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:00,089 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:00,319 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:00,320 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:00,320 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 77 [2018-01-21 06:09:00,320 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:00,321 INFO L409 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-01-21 06:09:00,321 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-01-21 06:09:00,322 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2022, Invalid=3830, Unknown=0, NotChecked=0, Total=5852 [2018-01-21 06:09:00,322 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 52 states. [2018-01-21 06:09:00,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:00,416 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-01-21 06:09:00,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 06:09:00,416 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 41 [2018-01-21 06:09:00,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:00,417 INFO L225 Difference]: With dead ends: 52 [2018-01-21 06:09:00,417 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 06:09:00,417 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2459 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2075, Invalid=3931, Unknown=0, NotChecked=0, Total=6006 [2018-01-21 06:09:00,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 06:09:00,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-21 06:09:00,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 06:09:00,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-01-21 06:09:00,420 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-01-21 06:09:00,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:00,420 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-01-21 06:09:00,420 INFO L433 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-01-21 06:09:00,420 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-01-21 06:09:00,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 06:09:00,420 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:00,420 INFO L322 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:00,420 INFO L371 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:00,421 INFO L82 PathProgramCache]: Analyzing trace with hash -533214512, now seen corresponding path program 24 times [2018-01-21 06:09:00,421 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:00,421 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:00,421 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:00,421 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:00,421 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:00,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:00,428 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:00,700 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:00,701 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:00,701 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:00,701 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:00,701 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:00,701 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:00,701 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:00,708 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:09:00,708 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:09:00,714 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,716 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,717 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,718 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,719 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,720 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,721 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,722 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,723 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,724 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,725 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,726 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,727 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:00,728 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:00,729 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:00,962 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:00,963 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:01,822 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:01,842 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:01,842 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 49 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:01,845 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:09:01,845 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:09:01,855 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,861 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,869 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,877 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,885 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,894 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,904 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,914 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,924 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,935 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,946 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,958 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:01,993 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:02,002 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:02,005 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:02,011 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:02,011 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:02,205 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:02,206 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:02,206 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 80 [2018-01-21 06:09:02,206 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:02,207 INFO L409 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-01-21 06:09:02,207 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-01-21 06:09:02,208 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2181, Invalid=4139, Unknown=0, NotChecked=0, Total=6320 [2018-01-21 06:09:02,208 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 54 states. [2018-01-21 06:09:02,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:02,285 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-01-21 06:09:02,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 06:09:02,285 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 42 [2018-01-21 06:09:02,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:02,286 INFO L225 Difference]: With dead ends: 53 [2018-01-21 06:09:02,286 INFO L226 Difference]: Without dead ends: 44 [2018-01-21 06:09:02,286 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2662 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2236, Invalid=4244, Unknown=0, NotChecked=0, Total=6480 [2018-01-21 06:09:02,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-01-21 06:09:02,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-01-21 06:09:02,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 06:09:02,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-01-21 06:09:02,289 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-01-21 06:09:02,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:02,290 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-01-21 06:09:02,290 INFO L433 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-01-21 06:09:02,290 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-01-21 06:09:02,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-01-21 06:09:02,291 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:02,291 INFO L322 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:02,291 INFO L371 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:02,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1800401163, now seen corresponding path program 25 times [2018-01-21 06:09:02,291 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:02,292 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:02,292 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:02,292 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:02,292 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:02,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:02,300 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:02,609 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:02,609 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:02,610 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:02,610 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:02,610 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:02,610 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:02,610 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:02,615 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:09:02,615 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:09:02,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:02,629 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:02,870 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:02,870 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:03,809 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:03,829 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:03,829 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 51 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:03,832 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:09:03,832 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:09:03,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:03,862 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:03,867 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:03,868 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:04,060 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:04,061 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:04,061 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 83 [2018-01-21 06:09:04,061 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:04,061 INFO L409 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-01-21 06:09:04,062 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-01-21 06:09:04,062 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=4460, Unknown=0, NotChecked=0, Total=6806 [2018-01-21 06:09:04,062 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 56 states. [2018-01-21 06:09:04,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:04,113 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-01-21 06:09:04,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-21 06:09:04,113 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 43 [2018-01-21 06:09:04,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:04,114 INFO L225 Difference]: With dead ends: 54 [2018-01-21 06:09:04,114 INFO L226 Difference]: Without dead ends: 45 [2018-01-21 06:09:04,114 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2873 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2403, Invalid=4569, Unknown=0, NotChecked=0, Total=6972 [2018-01-21 06:09:04,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-01-21 06:09:04,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-01-21 06:09:04,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-01-21 06:09:04,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-01-21 06:09:04,117 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-01-21 06:09:04,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:04,118 INFO L432 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-01-21 06:09:04,118 INFO L433 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-01-21 06:09:04,118 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-01-21 06:09:04,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-21 06:09:04,118 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:04,118 INFO L322 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:04,118 INFO L371 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:04,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1128043056, now seen corresponding path program 26 times [2018-01-21 06:09:04,118 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:04,119 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:04,119 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:09:04,119 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:04,119 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:04,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:04,126 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:04,589 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:04,589 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:04,589 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:04,589 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:04,589 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:04,589 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:04,589 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:04,597 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:09:04,597 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:09:04,605 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:04,613 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:04,615 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:04,617 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:04,901 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:04,901 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:05,879 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:05,898 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:05,898 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 53 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:05,901 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:09:05,901 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:09:05,911 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:05,925 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:05,936 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:05,940 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:05,946 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:05,946 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:06,174 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:06,175 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:06,175 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 86 [2018-01-21 06:09:06,175 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:06,176 INFO L409 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-01-21 06:09:06,176 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-01-21 06:09:06,176 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2517, Invalid=4793, Unknown=0, NotChecked=0, Total=7310 [2018-01-21 06:09:06,176 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 58 states. [2018-01-21 06:09:06,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:06,233 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-01-21 06:09:06,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-01-21 06:09:06,233 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 44 [2018-01-21 06:09:06,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:06,234 INFO L225 Difference]: With dead ends: 55 [2018-01-21 06:09:06,234 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 06:09:06,234 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3092 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2576, Invalid=4906, Unknown=0, NotChecked=0, Total=7482 [2018-01-21 06:09:06,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 06:09:06,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-01-21 06:09:06,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 06:09:06,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-01-21 06:09:06,236 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-01-21 06:09:06,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:06,236 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-01-21 06:09:06,236 INFO L433 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-01-21 06:09:06,237 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-01-21 06:09:06,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-01-21 06:09:06,237 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:06,237 INFO L322 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:06,237 INFO L371 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:06,237 INFO L82 PathProgramCache]: Analyzing trace with hash 1759778219, now seen corresponding path program 27 times [2018-01-21 06:09:06,237 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:06,238 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:06,238 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:06,238 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:06,238 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:06,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:06,246 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:06,564 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:06,564 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:06,564 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:06,564 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:06,565 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:06,565 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:06,565 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:06,570 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:09:06,570 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:09:06,576 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,578 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,579 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,580 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,582 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,583 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,585 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,586 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,587 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,589 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,590 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,591 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,592 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,593 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,594 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:06,595 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:06,596 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:06,867 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:06,868 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:07,921 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:07,941 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:07,941 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 55 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:07,943 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:09:07,944 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:09:07,954 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:07,961 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:07,968 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:07,977 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:07,985 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:07,994 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,004 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,014 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,024 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,035 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,047 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,058 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,071 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,083 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,096 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:08,106 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:08,109 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:08,115 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:08,115 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:08,335 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:08,336 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:08,337 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 89 [2018-01-21 06:09:08,337 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:08,337 INFO L409 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-01-21 06:09:08,337 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-01-21 06:09:08,337 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2694, Invalid=5138, Unknown=0, NotChecked=0, Total=7832 [2018-01-21 06:09:08,338 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 60 states. [2018-01-21 06:09:08,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:08,393 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-01-21 06:09:08,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 06:09:08,393 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 45 [2018-01-21 06:09:08,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:08,393 INFO L225 Difference]: With dead ends: 56 [2018-01-21 06:09:08,393 INFO L226 Difference]: Without dead ends: 47 [2018-01-21 06:09:08,394 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3319 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2755, Invalid=5255, Unknown=0, NotChecked=0, Total=8010 [2018-01-21 06:09:08,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-01-21 06:09:08,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-01-21 06:09:08,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 06:09:08,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-01-21 06:09:08,396 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-01-21 06:09:08,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:08,396 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-01-21 06:09:08,396 INFO L433 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-01-21 06:09:08,396 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-01-21 06:09:08,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 06:09:08,397 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:08,397 INFO L322 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:08,397 INFO L371 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:08,397 INFO L82 PathProgramCache]: Analyzing trace with hash -131268208, now seen corresponding path program 28 times [2018-01-21 06:09:08,397 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:08,397 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:08,397 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:08,398 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:08,398 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:08,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:08,407 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:08,769 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:08,770 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:08,770 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:08,770 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:08,770 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:08,770 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:08,770 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:08,776 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:09:08,776 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:09:08,791 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:08,793 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:09,082 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:09,082 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:10,218 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:10,238 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:10,238 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 57 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:10,240 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:09:10,241 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:09:10,280 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:10,284 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:10,290 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:10,290 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:10,513 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:10,514 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:10,514 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 92 [2018-01-21 06:09:10,514 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:10,514 INFO L409 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-01-21 06:09:10,515 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-01-21 06:09:10,515 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2877, Invalid=5495, Unknown=0, NotChecked=0, Total=8372 [2018-01-21 06:09:10,515 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 62 states. [2018-01-21 06:09:10,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:10,578 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-01-21 06:09:10,578 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 06:09:10,578 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 46 [2018-01-21 06:09:10,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:10,578 INFO L225 Difference]: With dead ends: 57 [2018-01-21 06:09:10,578 INFO L226 Difference]: Without dead ends: 48 [2018-01-21 06:09:10,579 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3554 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2940, Invalid=5616, Unknown=0, NotChecked=0, Total=8556 [2018-01-21 06:09:10,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-01-21 06:09:10,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-01-21 06:09:10,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 06:09:10,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-01-21 06:09:10,582 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-01-21 06:09:10,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:10,582 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-01-21 06:09:10,582 INFO L433 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-01-21 06:09:10,583 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-01-21 06:09:10,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 06:09:10,583 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:10,583 INFO L322 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:10,583 INFO L371 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:10,583 INFO L82 PathProgramCache]: Analyzing trace with hash 1375834699, now seen corresponding path program 29 times [2018-01-21 06:09:10,583 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:10,584 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:10,584 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:10,584 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:10,584 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:10,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:10,591 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:11,016 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:11,016 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:11,016 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:11,016 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:11,016 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:11,016 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:11,016 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:11,021 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:09:11,021 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:09:11,025 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,026 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,027 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,027 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,028 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,029 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,030 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,030 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,031 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,032 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,033 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,034 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,035 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,036 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,037 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,041 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:11,042 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:11,044 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:11,363 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:11,363 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:12,547 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:12,567 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:12,581 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 59 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:12,584 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:09:12,584 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:09:12,588 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,590 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,593 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,596 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,600 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,605 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,609 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,614 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,619 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,625 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,632 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,638 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,645 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,653 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,661 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,674 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:12,685 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:12,688 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:12,694 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:12,695 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:12,953 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:12,954 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:12,954 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 95 [2018-01-21 06:09:12,954 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:12,955 INFO L409 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-01-21 06:09:12,955 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-01-21 06:09:12,956 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3066, Invalid=5864, Unknown=0, NotChecked=0, Total=8930 [2018-01-21 06:09:12,956 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 64 states. [2018-01-21 06:09:13,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:13,027 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-01-21 06:09:13,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-21 06:09:13,027 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 47 [2018-01-21 06:09:13,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:13,028 INFO L225 Difference]: With dead ends: 58 [2018-01-21 06:09:13,028 INFO L226 Difference]: Without dead ends: 49 [2018-01-21 06:09:13,028 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 124 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3797 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3131, Invalid=5989, Unknown=0, NotChecked=0, Total=9120 [2018-01-21 06:09:13,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-21 06:09:13,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-01-21 06:09:13,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-01-21 06:09:13,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-01-21 06:09:13,030 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-01-21 06:09:13,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:13,031 INFO L432 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-01-21 06:09:13,031 INFO L433 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-01-21 06:09:13,031 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-01-21 06:09:13,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-01-21 06:09:13,031 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:13,031 INFO L322 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:13,031 INFO L371 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:13,031 INFO L82 PathProgramCache]: Analyzing trace with hash 851384560, now seen corresponding path program 30 times [2018-01-21 06:09:13,031 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:13,032 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:13,032 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:13,032 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:13,032 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:13,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:13,039 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:13,409 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:13,409 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:13,409 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:13,409 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:13,409 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:13,409 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:13,409 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:13,414 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:09:13,414 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:09:13,421 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,423 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,424 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,425 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,426 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,427 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,428 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,429 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,430 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,431 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,432 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,433 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,434 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,436 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,437 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,438 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:13,438 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:13,440 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:13,764 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:13,764 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:15,094 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:15,114 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:15,114 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 61 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:15,117 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:09:15,117 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:09:15,127 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,134 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,141 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,149 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,158 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,166 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,176 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,185 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,196 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,206 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,217 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,229 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,241 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,253 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,266 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,280 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:09:15,290 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:15,294 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:15,301 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:15,301 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:15,598 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:15,599 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:15,599 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 98 [2018-01-21 06:09:15,599 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:15,599 INFO L409 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-01-21 06:09:15,600 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-01-21 06:09:15,600 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3261, Invalid=6245, Unknown=0, NotChecked=0, Total=9506 [2018-01-21 06:09:15,600 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 66 states. [2018-01-21 06:09:15,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:15,672 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-01-21 06:09:15,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-01-21 06:09:15,673 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 48 [2018-01-21 06:09:15,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:15,673 INFO L225 Difference]: With dead ends: 59 [2018-01-21 06:09:15,673 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 06:09:15,674 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4048 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=3328, Invalid=6374, Unknown=0, NotChecked=0, Total=9702 [2018-01-21 06:09:15,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 06:09:15,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-01-21 06:09:15,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 06:09:15,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-01-21 06:09:15,676 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-01-21 06:09:15,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:15,676 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-01-21 06:09:15,676 INFO L433 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-01-21 06:09:15,676 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-01-21 06:09:15,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-21 06:09:15,677 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:15,677 INFO L322 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:15,677 INFO L371 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:15,677 INFO L82 PathProgramCache]: Analyzing trace with hash 1773299435, now seen corresponding path program 31 times [2018-01-21 06:09:15,677 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:15,678 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:15,678 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:15,678 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:15,678 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:15,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:15,687 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:16,431 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:16,431 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:16,431 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:16,431 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:16,431 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:16,431 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:16,431 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:16,436 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:09:16,436 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:09:16,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:16,451 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:16,795 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:16,795 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:18,128 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:18,148 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:18,148 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 63 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:18,151 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:09:18,151 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:09:18,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:18,185 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:18,191 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:18,191 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:18,447 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:18,448 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:18,449 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 101 [2018-01-21 06:09:18,449 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:18,449 INFO L409 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-01-21 06:09:18,449 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-01-21 06:09:18,450 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3462, Invalid=6638, Unknown=0, NotChecked=0, Total=10100 [2018-01-21 06:09:18,450 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 68 states. [2018-01-21 06:09:18,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:18,508 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-01-21 06:09:18,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 06:09:18,508 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 49 [2018-01-21 06:09:18,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:18,509 INFO L225 Difference]: With dead ends: 60 [2018-01-21 06:09:18,509 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 06:09:18,509 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4307 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3531, Invalid=6771, Unknown=0, NotChecked=0, Total=10302 [2018-01-21 06:09:18,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 06:09:18,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-01-21 06:09:18,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-01-21 06:09:18,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-01-21 06:09:18,512 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-01-21 06:09:18,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:18,512 INFO L432 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-01-21 06:09:18,512 INFO L433 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-01-21 06:09:18,512 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-01-21 06:09:18,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-01-21 06:09:18,512 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:18,512 INFO L322 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:18,513 INFO L371 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:18,513 INFO L82 PathProgramCache]: Analyzing trace with hash 287889488, now seen corresponding path program 32 times [2018-01-21 06:09:18,513 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:18,513 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:18,513 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:09:18,513 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:18,514 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:18,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:18,526 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:18,960 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:18,960 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:18,960 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:18,960 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:18,960 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:18,961 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:18,961 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:18,965 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:09:18,966 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:09:18,972 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:18,978 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:18,980 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:18,981 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:19,345 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:19,345 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:20,757 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:20,777 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:20,777 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 65 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:20,779 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:09:20,780 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:09:20,790 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:20,804 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:20,817 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:20,821 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:20,828 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:20,828 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:21,102 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:21,103 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:21,103 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 104 [2018-01-21 06:09:21,103 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:21,104 INFO L409 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-01-21 06:09:21,104 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-01-21 06:09:21,104 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3669, Invalid=7043, Unknown=0, NotChecked=0, Total=10712 [2018-01-21 06:09:21,105 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 70 states. [2018-01-21 06:09:21,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:21,225 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-01-21 06:09:21,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-01-21 06:09:21,226 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 50 [2018-01-21 06:09:21,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:21,227 INFO L225 Difference]: With dead ends: 61 [2018-01-21 06:09:21,227 INFO L226 Difference]: Without dead ends: 52 [2018-01-21 06:09:21,228 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 130 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4574 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3740, Invalid=7180, Unknown=0, NotChecked=0, Total=10920 [2018-01-21 06:09:21,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-01-21 06:09:21,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-01-21 06:09:21,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-21 06:09:21,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-01-21 06:09:21,230 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-01-21 06:09:21,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:21,231 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-01-21 06:09:21,231 INFO L433 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-01-21 06:09:21,231 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-01-21 06:09:21,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-01-21 06:09:21,231 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:21,232 INFO L322 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:21,232 INFO L371 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:21,232 INFO L82 PathProgramCache]: Analyzing trace with hash 1484821387, now seen corresponding path program 33 times [2018-01-21 06:09:21,232 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:21,233 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:21,233 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:21,233 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:21,233 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:21,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:21,246 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:21,785 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:21,785 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:21,785 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:21,786 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:21,786 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:21,786 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:21,786 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:21,791 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:09:21,792 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:09:21,798 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,800 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,801 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,802 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,803 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,804 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,805 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,806 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,807 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,808 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,810 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,811 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,812 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,813 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,814 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,815 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,817 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,818 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:21,818 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:21,820 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:22,209 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:22,210 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:23,700 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:23,719 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:23,719 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 67 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:23,722 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:09:23,722 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:09:23,732 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,739 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,747 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,755 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,763 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,772 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,782 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,792 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,802 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,813 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,824 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,836 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,848 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,862 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,876 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,891 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,907 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,921 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:09:23,933 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:23,937 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:23,944 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:23,944 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:24,240 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:24,241 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:24,241 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 107 [2018-01-21 06:09:24,241 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:24,242 INFO L409 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-01-21 06:09:24,242 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-01-21 06:09:24,242 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3882, Invalid=7460, Unknown=0, NotChecked=0, Total=11342 [2018-01-21 06:09:24,242 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 72 states. [2018-01-21 06:09:24,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:24,353 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-01-21 06:09:24,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-01-21 06:09:24,354 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 51 [2018-01-21 06:09:24,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:24,354 INFO L225 Difference]: With dead ends: 62 [2018-01-21 06:09:24,354 INFO L226 Difference]: Without dead ends: 53 [2018-01-21 06:09:24,355 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4849 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3955, Invalid=7601, Unknown=0, NotChecked=0, Total=11556 [2018-01-21 06:09:24,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-01-21 06:09:24,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-01-21 06:09:24,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-21 06:09:24,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-01-21 06:09:24,358 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-01-21 06:09:24,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:24,359 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-01-21 06:09:24,359 INFO L433 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-01-21 06:09:24,359 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-01-21 06:09:24,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 06:09:24,359 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:24,359 INFO L322 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:24,360 INFO L371 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:24,360 INFO L82 PathProgramCache]: Analyzing trace with hash -64995408, now seen corresponding path program 34 times [2018-01-21 06:09:24,360 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:24,360 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:24,361 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:24,361 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:24,361 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:24,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:24,374 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:24,894 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:24,894 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:24,894 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:24,895 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:24,895 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:24,895 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:24,895 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:24,899 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:09:24,900 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:09:24,916 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:24,918 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:25,317 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:25,317 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:26,925 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:26,945 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:26,945 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 69 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:09:26,948 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:09:26,948 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:09:26,993 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:26,997 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:27,004 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:27,005 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:09:27,303 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:27,304 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:09:27,304 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 110 [2018-01-21 06:09:27,304 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:09:27,305 INFO L409 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-01-21 06:09:27,305 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-01-21 06:09:27,305 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=4101, Invalid=7889, Unknown=0, NotChecked=0, Total=11990 [2018-01-21 06:09:27,305 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 74 states. [2018-01-21 06:09:27,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:09:27,361 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-01-21 06:09:27,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-21 06:09:27,361 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 52 [2018-01-21 06:09:27,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:09:27,362 INFO L225 Difference]: With dead ends: 63 [2018-01-21 06:09:27,362 INFO L226 Difference]: Without dead ends: 54 [2018-01-21 06:09:27,362 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5132 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4176, Invalid=8034, Unknown=0, NotChecked=0, Total=12210 [2018-01-21 06:09:27,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-01-21 06:09:27,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-01-21 06:09:27,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-01-21 06:09:27,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-01-21 06:09:27,364 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-01-21 06:09:27,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:09:27,365 INFO L432 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-01-21 06:09:27,365 INFO L433 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-01-21 06:09:27,365 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-01-21 06:09:27,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-01-21 06:09:27,365 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:09:27,365 INFO L322 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:09:27,365 INFO L371 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:09:27,365 INFO L82 PathProgramCache]: Analyzing trace with hash -864675797, now seen corresponding path program 35 times [2018-01-21 06:09:27,365 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:09:27,366 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:27,366 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:09:27,366 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:09:27,366 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:09:27,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:09:27,376 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:09:28,177 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:28,178 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:28,178 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:09:28,178 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:09:28,178 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:09:28,178 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:09:28,178 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:09:28,188 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:09:28,188 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:09:28,193 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,194 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,195 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,195 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,196 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,197 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,198 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,198 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,199 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,200 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,201 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,202 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,203 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,204 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,205 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,206 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,207 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,208 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,211 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:09:28,212 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:09:28,214 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:09:28,638 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:09:28,638 INFO L314 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-01-21 06:09:29,616 INFO L175 TraceCheckSpWp]: Timeout while computing interpolants [2018-01-21 06:09:29,616 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 06:09:29,618 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:09:29,618 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:09:29,618 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:09:29,618 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:09:29,618 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:09:29,618 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:09:29,619 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:09:29,619 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 06:09:29,619 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:09:29,619 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 06:09:29,619 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 06:09:29,620 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.01 06:09:29 BoogieIcfgContainer [2018-01-21 06:09:29,620 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-01-21 06:09:29,621 INFO L168 Benchmark]: Toolchain (without parser) took 53782.36 ms. Allocated memory was 307.2 MB in the beginning and 829.4 MB in the end (delta: 522.2 MB). Free memory was 268.1 MB in the beginning and 322.4 MB in the end (delta: -54.2 MB). Peak memory consumption was 468.0 MB. Max. memory is 5.3 GB. [2018-01-21 06:09:29,621 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 307.2 MB. Free memory is still 272.1 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-21 06:09:29,621 INFO L168 Benchmark]: CACSL2BoogieTranslator took 196.90 ms. Allocated memory is still 307.2 MB. Free memory was 266.1 MB in the beginning and 258.2 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 5.3 GB. [2018-01-21 06:09:29,622 INFO L168 Benchmark]: Boogie Preprocessor took 35.50 ms. Allocated memory is still 307.2 MB. Free memory is still 258.2 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-21 06:09:29,622 INFO L168 Benchmark]: RCFGBuilder took 176.66 ms. Allocated memory is still 307.2 MB. Free memory was 258.2 MB in the beginning and 245.2 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 5.3 GB. [2018-01-21 06:09:29,622 INFO L168 Benchmark]: TraceAbstraction took 53365.18 ms. Allocated memory was 307.2 MB in the beginning and 829.4 MB in the end (delta: 522.2 MB). Free memory was 245.2 MB in the beginning and 322.4 MB in the end (delta: -77.1 MB). Peak memory consumption was 445.0 MB. Max. memory is 5.3 GB. [2018-01-21 06:09:29,623 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 307.2 MB. Free memory is still 272.1 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 196.90 ms. Allocated memory is still 307.2 MB. Free memory was 266.1 MB in the beginning and 258.2 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 35.50 ms. Allocated memory is still 307.2 MB. Free memory is still 258.2 MB. There was no memory consumed. Max. memory is 5.3 GB. * RCFGBuilder took 176.66 ms. Allocated memory is still 307.2 MB. Free memory was 258.2 MB in the beginning and 245.2 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 5.3 GB. * TraceAbstraction took 53365.18 ms. Allocated memory was 307.2 MB in the beginning and 829.4 MB in the end (delta: 522.2 MB). Free memory was 245.2 MB in the beginning and 322.4 MB in the end (delta: -77.1 MB). Peak memory consumption was 445.0 MB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 18 LocStat_MAX_WEQGRAPH_SIZE : 2 LocStat_MAX_SIZEOF_WEQEDGELABEL : 1 LocStat_NO_SUPPORTING_EQUALITIES : 126 LocStat_NO_SUPPORTING_DISEQUALITIES : 29 LocStat_NO_DISJUNCTIONS : -36 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 25 TransStat_MAX_WEQGRAPH_SIZE : 2 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 35 TransStat_NO_SUPPORTING_DISEQUALITIES : 5 TransStat_NO_DISJUNCTIONS : 25 TransStat_MAX_NO_DISJUNCTIONS : 1 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 0.264106 RENAME_VARIABLES(MILLISECONDS) : 0.077501 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 0.209272 PROJECTAWAY(MILLISECONDS) : 0.095973 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.140365 DISJOIN(MILLISECONDS) : 0.000000 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.113441 ADD_EQUALITY(MILLISECONDS) : 0.032334 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.012448 #CONJOIN_DISJUNCTIVE : 34 #RENAME_VARIABLES : 64 #UNFREEZE : 0 #CONJOIN : 64 #PROJECTAWAY : 66 #ADD_WEAK_EQUALITY : 4 #DISJOIN : 0 #RENAME_VARIABLES_DISJUNCTIVE : 64 #ADD_EQUALITY : 35 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 2 * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 1]: not all allocated memory was freed not all allocated memory was freed We found a FailurePath: - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.initErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. UNSAFE Result, 0.1s OverallTime, 1 OverallIterations, 1 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 3 NumberOfCodeBlocks, 3 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 1]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 1). Cancelled while BasicCegarLoop was analyzing trace of length 54 with TraceHistMax 35, while TraceCheckSpWp was constructing backward predicates, while PredicateUnifier was unifying predicates, while SimplifyDDAWithTimeout was simplifying term of DAG size 8. - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.startErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 53.1s OverallTime, 36 OverallIterations, 35 TraceHistogramMax, 2.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 598 SDtfs, 114 SDslu, 10903 SDs, 0 SdLazy, 2432 SolverSat, 131 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5530 GetRequests, 3436 SyntacticMatches, 68 SemanticMatches, 2026 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63597 ImplicationChecksByTransitivity, 31.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=54occurred in iteration=35, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.9s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 35 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.6s SatisfiabilityAnalysisTime, 43.1s InterpolantComputationTime, 3639 NumberOfCodeBlocks, 3639 NumberOfCodeBlocksAsserted, 421 NumberOfCheckSat, 5882 ConstructedInterpolants, 0 QuantifiedInterpolants, 908650 SizeOfPredicates, 68 NumberOfNonLiveVariables, 7990 ConjunctsInSsa, 1394 ConjunctsInUnsatCore, 171 InterpolantComputations, 1 PerfectInterpolantSequences, 0/35700 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 25]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 25). Cancelled while IsEmpty was searching accepting run (input had 22 states). - StatisticsResult: Ultimate Automizer benchmark data for error location: mainErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 0.0s OverallTime, 0 OverallIterations, 0 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, REUSE_STATISTICS: No data available RESULT: Ultimate proved your program to be incorrect! Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-Benchmark-0-2018-01-21_06-09-29-634.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-VPDomainBenchmark-0-2018-01-21_06-09-29-634.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-BenchmarkWithCounters-0-2018-01-21_06-09-29-634.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-0-2018-01-21_06-09-29-634.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-1-2018-01-21_06-09-29-634.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-2-2018-01-21_06-09-29-634.csv Completed graceful shutdown