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/memset3_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:07:38,573 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:07:38,575 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:07:38,590 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:07:38,590 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:07:38,590 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:07:38,591 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:07:38,592 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:07:38,594 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:07:38,595 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:07:38,595 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:07:38,595 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:07:38,596 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:07:38,597 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:07:38,598 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:07:38,600 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:07:38,602 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:07:38,604 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:07:38,606 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:07:38,607 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:07:38,609 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 06:07:38,614 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:07:38,615 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:07:38,615 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 06:07:38,625 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:07:38,625 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:07:38,626 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:07:38,626 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:07:38,627 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:07:38,627 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:07:38,627 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:07:38,627 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:07:38,628 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:07:38,628 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:07:38,628 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:07:38,628 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:07:38,629 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:07:38,629 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:07:38,629 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:07:38,629 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:07:38,629 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:07:38,630 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:07:38,630 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:07:38,630 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:07:38,630 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:07:38,630 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:07:38,631 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:07:38,631 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:07:38,631 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:07:38,631 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:07:38,631 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:07:38,632 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:07:38,632 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:07:38,632 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:07:38,632 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:07:38,632 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:07:38,632 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:07:38,633 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:07:38,633 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:07:38,633 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:07:38,633 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:07:38,634 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:07:38,634 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:07:38,667 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:07:38,679 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:07:38,682 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:07:38,684 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:07:38,684 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:07:38,685 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/memset3_true-valid-memsafety_true-termination.c [2018-01-21 06:07:38,785 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:07:38,790 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:07:38,790 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:07:38,791 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:07:38,796 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:07:38,797 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:07:38" (1/1) ... [2018-01-21 06:07:38,800 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45bc08e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38, skipping insertion in model container [2018-01-21 06:07:38,800 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:07:38" (1/1) ... [2018-01-21 06:07:38,814 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:07:38,830 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:07:38,946 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:07:38,961 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:07:38,966 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38 WrapperNode [2018-01-21 06:07:38,966 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:07:38,967 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:07:38,967 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:07:38,967 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:07:38,979 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38" (1/1) ... [2018-01-21 06:07:38,979 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38" (1/1) ... [2018-01-21 06:07:38,987 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38" (1/1) ... [2018-01-21 06:07:38,988 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38" (1/1) ... [2018-01-21 06:07:38,991 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38" (1/1) ... [2018-01-21 06:07:38,994 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38" (1/1) ... [2018-01-21 06:07:38,995 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38" (1/1) ... [2018-01-21 06:07:38,997 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:07:38,997 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:07:38,997 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:07:38,998 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:07:38,999 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38" (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 06:07:39,052 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:07:39,052 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:07:39,052 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:07:39,052 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:07:39,053 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:07:39,053 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:07:39,053 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2018-01-21 06:07:39,053 INFO L136 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2018-01-21 06:07:39,053 INFO L128 BoogieDeclarations]: Found specification of procedure memset [2018-01-21 06:07:39,053 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:07:39,054 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:07:39,054 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:07:39,190 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:07:39,190 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:07:39 BoogieIcfgContainer [2018-01-21 06:07:39,190 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:07:39,191 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:07:39,191 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:07:39,193 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:07:39,193 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:07:38" (1/3) ... [2018-01-21 06:07:39,194 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a784f0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:07:39, skipping insertion in model container [2018-01-21 06:07:39,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:07:38" (2/3) ... [2018-01-21 06:07:39,195 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a784f0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:07:39, skipping insertion in model container [2018-01-21 06:07:39,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:07:39" (3/3) ... [2018-01-21 06:07:39,197 INFO L105 eAbstractionObserver]: Analyzing ICFG memset3_true-valid-memsafety_true-termination.c [2018-01-21 06:07:39,204 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:07:39,210 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 06:07:39,250 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:07:39,251 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:07:39,251 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:07:39,251 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:07:39,251 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:07:39,251 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:07:39,252 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:07:39,252 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:07:39,253 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:07:39,275 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 06:07:39,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:07:39,283 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:39,284 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:07:39,284 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:07:39,290 INFO L82 PathProgramCache]: Analyzing trace with hash 51896, now seen corresponding path program 1 times [2018-01-21 06:07:39,293 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:39,351 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:39,352 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:39,352 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:39,352 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:39,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:07:39,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:07:39,420 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:07:39,428 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:07:39,435 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:07:39,436 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:07:39,436 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:07:39,436 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:07:39,436 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:07:39,436 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:07:39,436 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:07:39,436 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:07:39,437 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:07:39,438 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 06:07:39,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-21 06:07:39,439 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:39,439 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 06:07:39,439 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:39,440 INFO L82 PathProgramCache]: Analyzing trace with hash 126067280, now seen corresponding path program 1 times [2018-01-21 06:07:39,440 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:39,441 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:39,441 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:39,442 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:39,442 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:39,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:39,480 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:39,594 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 06:07:39,596 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:07:39,596 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 06:07:39,596 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:07:39,598 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 06:07:39,609 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 06:07:39,609 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 06:07:39,611 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2018-01-21 06:07:39,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:39,664 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-21 06:07:39,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 06:07:39,666 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2018-01-21 06:07:39,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:39,676 INFO L225 Difference]: With dead ends: 34 [2018-01-21 06:07:39,676 INFO L226 Difference]: Without dead ends: 20 [2018-01-21 06:07:39,742 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 06:07:39,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-01-21 06:07:39,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-01-21 06:07:39,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-01-21 06:07:39,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-01-21 06:07:39,773 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-01-21 06:07:39,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:39,773 INFO L432 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-01-21 06:07:39,774 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 06:07:39,774 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-01-21 06:07:39,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:07:39,774 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:39,774 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 06:07:39,775 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:39,775 INFO L82 PathProgramCache]: Analyzing trace with hash 763300235, now seen corresponding path program 1 times [2018-01-21 06:07:39,775 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:39,776 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:39,776 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:39,776 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:39,776 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:39,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:39,793 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:39,861 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 06:07:39,862 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:39,862 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:39,863 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-01-21 06:07:39,865 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 06:07:39,910 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:07:39,911 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:07:40,641 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:07:40,642 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 06:07:40,652 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:07:40,653 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:40,653 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 06:07:40,667 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:40,668 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:07:40,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:40,699 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:40,811 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 06:07:40,811 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:41,067 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 06:07:41,102 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:41,102 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 06:07:41,109 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:41,109 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:07:41,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:41,137 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:41,143 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 06:07:41,143 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:41,268 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 06:07:41,269 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:41,269 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 11 [2018-01-21 06:07:41,269 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:41,270 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 06:07:41,271 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 06:07:41,271 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-01-21 06:07:41,271 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 8 states. [2018-01-21 06:07:41,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:41,288 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-01-21 06:07:41,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:07:41,288 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2018-01-21 06:07:41,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:41,289 INFO L225 Difference]: With dead ends: 30 [2018-01-21 06:07:41,289 INFO L226 Difference]: Without dead ends: 21 [2018-01-21 06:07:41,290 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2018-01-21 06:07:41,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-01-21 06:07:41,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-01-21 06:07:41,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-01-21 06:07:41,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-01-21 06:07:41,293 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-01-21 06:07:41,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:41,293 INFO L432 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-01-21 06:07:41,294 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 06:07:41,294 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-01-21 06:07:41,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 06:07:41,294 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:41,294 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 06:07:41,294 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:41,295 INFO L82 PathProgramCache]: Analyzing trace with hash -957314640, now seen corresponding path program 2 times [2018-01-21 06:07:41,295 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:41,296 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:41,296 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:41,296 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:41,296 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:41,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:41,310 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:41,399 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 06:07:41,399 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:41,400 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:41,400 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:41,400 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:41,400 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:41,400 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 06:07:41,405 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:07:41,405 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:41,416 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:41,418 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:41,419 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:41,421 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:41,446 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 06:07:41,446 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:41,620 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 06:07:41,649 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:41,650 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 06:07:41,653 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:07:41,653 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:41,669 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:41,680 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:41,688 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:41,692 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:41,697 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 06:07:41,697 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:41,767 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 06:07:41,771 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:41,771 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 14 [2018-01-21 06:07:41,771 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:41,772 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:07:41,772 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:07:41,773 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=113, Unknown=0, NotChecked=0, Total=182 [2018-01-21 06:07:41,773 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 10 states. [2018-01-21 06:07:41,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:41,800 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-01-21 06:07:41,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 06:07:41,801 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2018-01-21 06:07:41,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:41,801 INFO L225 Difference]: With dead ends: 31 [2018-01-21 06:07:41,801 INFO L226 Difference]: Without dead ends: 22 [2018-01-21 06:07:41,802 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 06:07:41,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-01-21 06:07:41,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-01-21 06:07:41,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-01-21 06:07:41,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-01-21 06:07:41,805 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-01-21 06:07:41,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:41,806 INFO L432 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-01-21 06:07:41,806 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:07:41,806 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-01-21 06:07:41,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-21 06:07:41,807 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:41,807 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 06:07:41,807 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:41,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1538199083, now seen corresponding path program 3 times [2018-01-21 06:07:41,807 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:41,808 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:41,808 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:41,809 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:41,809 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:41,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:41,821 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:41,877 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 06:07:41,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:41,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:41,877 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:41,878 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:41,878 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:41,878 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 06:07:41,883 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:07:41,883 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:07:41,891 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:41,893 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:41,894 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:41,894 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:41,896 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:41,941 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 06:07:41,942 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:42,051 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 06:07:42,072 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:42,072 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 06:07:42,075 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:07:42,075 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:07:42,088 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:42,095 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:42,103 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:42,109 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:42,112 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:42,117 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 06:07:42,117 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:42,163 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 06:07:42,164 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:42,164 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 17 [2018-01-21 06:07:42,165 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:42,165 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 06:07:42,165 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 06:07:42,165 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:07:42,166 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 12 states. [2018-01-21 06:07:42,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:42,203 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-01-21 06:07:42,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 06:07:42,204 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2018-01-21 06:07:42,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:42,204 INFO L225 Difference]: With dead ends: 32 [2018-01-21 06:07:42,205 INFO L226 Difference]: Without dead ends: 23 [2018-01-21 06:07:42,205 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 06:07:42,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-01-21 06:07:42,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-01-21 06:07:42,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-01-21 06:07:42,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-01-21 06:07:42,210 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-01-21 06:07:42,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:42,210 INFO L432 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-01-21 06:07:42,210 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 06:07:42,210 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-01-21 06:07:42,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 06:07:42,211 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:42,211 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 06:07:42,211 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:42,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1589713168, now seen corresponding path program 4 times [2018-01-21 06:07:42,211 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:42,212 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:42,212 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:42,212 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:42,213 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:42,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:42,226 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:42,301 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 06:07:42,301 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:42,301 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:42,301 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:42,301 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:42,301 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:42,301 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 06:07:42,306 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:07:42,307 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:07:42,323 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:42,324 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:42,352 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 06:07:42,352 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:42,466 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 06:07:42,487 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:42,487 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 06:07:42,490 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:07:42,490 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:07:42,517 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:42,521 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:42,526 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 06:07:42,526 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:42,592 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 06:07:42,593 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:42,593 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-21 06:07:42,593 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:42,594 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 06:07:42,594 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 06:07:42,595 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=239, Unknown=0, NotChecked=0, Total=380 [2018-01-21 06:07:42,595 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 14 states. [2018-01-21 06:07:42,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:42,629 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-01-21 06:07:42,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 06:07:42,629 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 22 [2018-01-21 06:07:42,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:42,629 INFO L225 Difference]: With dead ends: 33 [2018-01-21 06:07:42,630 INFO L226 Difference]: Without dead ends: 24 [2018-01-21 06:07:42,630 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 06:07:42,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-01-21 06:07:42,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-01-21 06:07:42,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-01-21 06:07:42,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-01-21 06:07:42,633 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-01-21 06:07:42,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:42,633 INFO L432 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-01-21 06:07:42,633 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 06:07:42,633 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-01-21 06:07:42,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-01-21 06:07:42,633 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:42,633 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 06:07:42,634 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:42,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1108317493, now seen corresponding path program 5 times [2018-01-21 06:07:42,634 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:42,634 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:42,634 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:42,635 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:42,635 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:42,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:42,645 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:42,767 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 06:07:42,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:42,767 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:42,767 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:42,767 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:42,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:42,768 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 06:07:42,774 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:07:42,774 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:42,780 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:42,783 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:42,784 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:42,789 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:42,790 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:42,792 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:42,843 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 06:07:42,844 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:42,961 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 06:07:42,982 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:42,982 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 06:07:42,985 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:07:42,985 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:42,989 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:42,990 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:42,994 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:43,005 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:43,012 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:43,015 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:43,021 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 06:07:43,021 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:43,081 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 06:07:43,082 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:43,082 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-21 06:07:43,083 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:43,083 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 06:07:43,083 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 06:07:43,083 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=320, Unknown=0, NotChecked=0, Total=506 [2018-01-21 06:07:43,083 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2018-01-21 06:07:43,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:43,116 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-21 06:07:43,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 06:07:43,116 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2018-01-21 06:07:43,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:43,117 INFO L225 Difference]: With dead ends: 34 [2018-01-21 06:07:43,117 INFO L226 Difference]: Without dead ends: 25 [2018-01-21 06:07:43,117 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2018-01-21 06:07:43,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-01-21 06:07:43,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-01-21 06:07:43,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-01-21 06:07:43,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-01-21 06:07:43,121 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-01-21 06:07:43,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:43,121 INFO L432 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-01-21 06:07:43,121 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 06:07:43,121 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-01-21 06:07:43,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 06:07:43,121 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:43,122 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 06:07:43,122 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:43,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1152077936, now seen corresponding path program 6 times [2018-01-21 06:07:43,122 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:43,122 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:43,123 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:43,123 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:43,123 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:43,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:43,133 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:43,216 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 06:07:43,216 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:43,216 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:43,216 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:43,216 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:43,216 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:43,216 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 06:07:43,226 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:07:43,226 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:07:43,234 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:43,237 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:43,238 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:43,242 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:43,242 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:43,244 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:43,300 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 06:07:43,300 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:43,441 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 06:07:43,462 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:43,462 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 06:07:43,465 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:07:43,465 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:07:43,476 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:43,483 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:43,491 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:43,500 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:43,506 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:43,509 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:43,515 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 06:07:43,515 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:43,590 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 06:07:43,593 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:43,593 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 26 [2018-01-21 06:07:43,593 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:43,593 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 06:07:43,593 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 06:07:43,594 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=413, Unknown=0, NotChecked=0, Total=650 [2018-01-21 06:07:43,594 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 18 states. [2018-01-21 06:07:43,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:43,671 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-01-21 06:07:43,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 06:07:43,672 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2018-01-21 06:07:43,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:43,672 INFO L225 Difference]: With dead ends: 35 [2018-01-21 06:07:43,673 INFO L226 Difference]: Without dead ends: 26 [2018-01-21 06:07:43,673 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 06:07:43,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-01-21 06:07:43,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-01-21 06:07:43,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-01-21 06:07:43,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-01-21 06:07:43,677 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-01-21 06:07:43,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:43,677 INFO L432 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-01-21 06:07:43,678 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 06:07:43,678 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-01-21 06:07:43,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-21 06:07:43,678 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:43,679 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 06:07:43,679 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:43,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1790107797, now seen corresponding path program 7 times [2018-01-21 06:07:43,679 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:43,680 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:43,680 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:43,680 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:43,680 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:43,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:43,692 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:43,807 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 06:07:43,807 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:43,807 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:43,807 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:43,807 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:43,807 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:43,807 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 06:07:43,815 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:43,815 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:07:43,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:43,827 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:43,891 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 06:07:43,891 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:44,059 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 06:07:44,078 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:44,079 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 06:07:44,082 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:44,082 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:07:44,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:44,103 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:44,107 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:07:44,107 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:44,165 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 06:07:44,167 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:44,167 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-21 06:07:44,167 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:44,167 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 06:07:44,167 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 06:07:44,168 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=518, Unknown=0, NotChecked=0, Total=812 [2018-01-21 06:07:44,168 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 20 states. [2018-01-21 06:07:44,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:44,199 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-01-21 06:07:44,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 06:07:44,199 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 25 [2018-01-21 06:07:44,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:44,200 INFO L225 Difference]: With dead ends: 36 [2018-01-21 06:07:44,200 INFO L226 Difference]: Without dead ends: 27 [2018-01-21 06:07:44,201 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 06:07:44,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-01-21 06:07:44,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-01-21 06:07:44,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-01-21 06:07:44,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-01-21 06:07:44,205 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-01-21 06:07:44,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:44,206 INFO L432 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-01-21 06:07:44,206 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 06:07:44,206 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-01-21 06:07:44,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-21 06:07:44,206 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:44,206 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 06:07:44,207 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:44,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1491414992, now seen corresponding path program 8 times [2018-01-21 06:07:44,207 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:44,208 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:44,208 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:44,208 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:44,208 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:44,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:44,219 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:44,322 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 06:07:44,322 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:44,322 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:44,322 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:44,322 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:44,322 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:44,322 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 06:07:44,329 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:07:44,329 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:44,337 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:44,340 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:44,341 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:44,343 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:44,416 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 06:07:44,416 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:44,645 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 06:07:44,665 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:44,665 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 06:07:44,668 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:07:44,668 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:44,679 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:44,692 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:44,703 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:44,707 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:44,712 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 06:07:44,713 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:44,782 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 06:07:44,784 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:44,784 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-21 06:07:44,784 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:44,784 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 06:07:44,785 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 06:07:44,785 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=635, Unknown=0, NotChecked=0, Total=992 [2018-01-21 06:07:44,785 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 22 states. [2018-01-21 06:07:44,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:44,810 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-01-21 06:07:44,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 06:07:44,810 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 26 [2018-01-21 06:07:44,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:44,811 INFO L225 Difference]: With dead ends: 37 [2018-01-21 06:07:44,811 INFO L226 Difference]: Without dead ends: 28 [2018-01-21 06:07:44,811 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=380, Invalid=676, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 06:07:44,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-01-21 06:07:44,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-01-21 06:07:44,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-01-21 06:07:44,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-01-21 06:07:44,814 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-01-21 06:07:44,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:44,814 INFO L432 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-01-21 06:07:44,814 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 06:07:44,814 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-01-21 06:07:44,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 06:07:44,815 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:44,815 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 06:07:44,815 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:44,815 INFO L82 PathProgramCache]: Analyzing trace with hash 139406347, now seen corresponding path program 9 times [2018-01-21 06:07:44,815 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:44,816 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:44,816 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:44,816 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:44,816 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:44,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:44,826 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:44,986 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 06:07:44,986 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:44,986 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:44,986 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:44,986 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:44,986 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:44,986 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 06:07:44,994 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:07:44,994 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:07:45,002 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,006 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,008 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,009 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,011 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,012 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,012 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:45,014 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:45,078 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 06:07:45,079 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:45,293 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 06:07:45,326 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:45,326 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 06:07:45,332 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:07:45,332 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:07:45,343 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,354 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,366 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,379 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,391 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,404 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:45,411 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:45,437 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:45,441 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 06:07:45,441 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:45,560 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 06:07:45,562 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:45,562 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 35 [2018-01-21 06:07:45,562 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:45,562 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 06:07:45,563 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 06:07:45,563 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=764, Unknown=0, NotChecked=0, Total=1190 [2018-01-21 06:07:45,563 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 24 states. [2018-01-21 06:07:45,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:45,640 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-01-21 06:07:45,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 06:07:45,641 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 27 [2018-01-21 06:07:45,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:45,641 INFO L225 Difference]: With dead ends: 38 [2018-01-21 06:07:45,641 INFO L226 Difference]: Without dead ends: 29 [2018-01-21 06:07:45,642 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 06:07:45,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-01-21 06:07:45,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-01-21 06:07:45,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-01-21 06:07:45,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-01-21 06:07:45,645 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-01-21 06:07:45,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:45,645 INFO L432 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-01-21 06:07:45,645 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 06:07:45,645 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-01-21 06:07:45,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 06:07:45,646 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:45,646 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 06:07:45,646 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:45,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1176811312, now seen corresponding path program 10 times [2018-01-21 06:07:45,646 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:45,647 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:45,647 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:45,647 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:45,648 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:45,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:45,655 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:45,743 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 06:07:45,743 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:45,743 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:45,743 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:45,743 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:45,744 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:45,744 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 06:07:45,750 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:07:45,750 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:07:45,760 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:45,762 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:45,842 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 06:07:45,842 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:46,084 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 06:07:46,104 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:46,104 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 06:07:46,107 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:07:46,107 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:07:46,133 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:46,137 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:46,143 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 06:07:46,143 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:46,214 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 06:07:46,215 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:46,216 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-21 06:07:46,216 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:46,216 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 06:07:46,217 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 06:07:46,217 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=905, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 06:07:46,218 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 26 states. [2018-01-21 06:07:46,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:46,271 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-01-21 06:07:46,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 06:07:46,271 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2018-01-21 06:07:46,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:46,272 INFO L225 Difference]: With dead ends: 39 [2018-01-21 06:07:46,272 INFO L226 Difference]: Without dead ends: 30 [2018-01-21 06:07:46,273 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 06:07:46,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-01-21 06:07:46,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-01-21 06:07:46,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-01-21 06:07:46,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-01-21 06:07:46,275 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-01-21 06:07:46,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:46,276 INFO L432 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-01-21 06:07:46,276 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 06:07:46,276 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-01-21 06:07:46,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-21 06:07:46,276 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:46,277 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 06:07:46,277 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:46,277 INFO L82 PathProgramCache]: Analyzing trace with hash -1023373141, now seen corresponding path program 11 times [2018-01-21 06:07:46,277 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:46,277 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:46,278 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:46,278 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:46,278 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:46,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:46,288 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:46,440 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 06:07:46,440 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:46,440 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:46,440 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:46,440 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:46,440 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:46,440 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 06:07:46,445 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:07:46,445 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:46,449 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,450 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,450 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,451 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,452 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,453 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,457 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,458 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:46,459 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:46,537 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 06:07:46,537 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:46,827 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 06:07:46,849 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:46,849 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 06:07:46,852 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:07:46,852 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:46,855 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,857 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,861 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,864 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,868 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,873 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,884 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:46,892 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:46,895 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:46,902 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 06:07:46,902 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:46,983 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 06:07:46,985 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:46,985 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-21 06:07:46,985 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:46,986 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 06:07:46,986 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 06:07:46,986 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=1058, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 06:07:46,986 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 28 states. [2018-01-21 06:07:47,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:47,028 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-01-21 06:07:47,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 06:07:47,029 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 29 [2018-01-21 06:07:47,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:47,029 INFO L225 Difference]: With dead ends: 40 [2018-01-21 06:07:47,029 INFO L226 Difference]: Without dead ends: 31 [2018-01-21 06:07:47,030 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=611, Invalid=1111, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 06:07:47,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-01-21 06:07:47,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-01-21 06:07:47,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-01-21 06:07:47,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-01-21 06:07:47,032 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-01-21 06:07:47,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:47,033 INFO L432 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-01-21 06:07:47,033 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 06:07:47,033 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-01-21 06:07:47,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 06:07:47,033 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:47,033 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 06:07:47,033 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:47,034 INFO L82 PathProgramCache]: Analyzing trace with hash -509614448, now seen corresponding path program 12 times [2018-01-21 06:07:47,034 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:47,034 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:47,035 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:47,035 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:47,035 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:47,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:47,045 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:47,184 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 06:07:47,184 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:47,184 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:47,184 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:47,185 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:47,185 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:47,185 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 06:07:47,195 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:07:47,195 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:07:47,203 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,208 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,217 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,225 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,238 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,251 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,258 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,262 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:47,264 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:47,375 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 06:07:47,375 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:47,736 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 06:07:47,757 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:47,757 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 06:07:47,760 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:07:47,760 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:07:47,771 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,781 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,789 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,798 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,807 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,817 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,827 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:47,835 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:47,838 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:47,844 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 06:07:47,844 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:47,966 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 06:07:47,967 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:47,967 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 44 [2018-01-21 06:07:47,967 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:47,968 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 06:07:47,968 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 06:07:47,969 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=1223, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 06:07:47,969 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-01-21 06:07:48,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:48,079 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-01-21 06:07:48,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-01-21 06:07:48,080 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-01-21 06:07:48,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:48,081 INFO L225 Difference]: With dead ends: 41 [2018-01-21 06:07:48,082 INFO L226 Difference]: Without dead ends: 32 [2018-01-21 06:07:48,082 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=700, Invalid=1280, Unknown=0, NotChecked=0, Total=1980 [2018-01-21 06:07:48,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-01-21 06:07:48,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-01-21 06:07:48,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-01-21 06:07:48,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-01-21 06:07:48,086 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-01-21 06:07:48,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:48,087 INFO L432 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-01-21 06:07:48,087 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 06:07:48,087 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-01-21 06:07:48,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 06:07:48,088 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:48,088 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 06:07:48,088 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:48,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1762964149, now seen corresponding path program 13 times [2018-01-21 06:07:48,088 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:48,089 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:48,089 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:48,089 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:48,089 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:48,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:48,102 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:48,287 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 06:07:48,288 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:48,288 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:48,288 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:48,288 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:48,288 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:48,288 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 06:07:48,296 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:48,296 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:07:48,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:48,311 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:48,451 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 06:07:48,451 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:48,929 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 06:07:48,949 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:48,950 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 06:07:48,952 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:48,953 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:07:48,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:48,975 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:48,979 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 06:07:48,979 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:49,067 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 06:07:49,069 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:49,069 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-21 06:07:49,069 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:49,069 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 06:07:49,069 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 06:07:49,070 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=1400, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 06:07:49,070 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 32 states. [2018-01-21 06:07:49,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:49,118 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-01-21 06:07:49,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 06:07:49,118 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 31 [2018-01-21 06:07:49,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:49,119 INFO L225 Difference]: With dead ends: 42 [2018-01-21 06:07:49,119 INFO L226 Difference]: Without dead ends: 33 [2018-01-21 06:07:49,119 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=795, Invalid=1461, Unknown=0, NotChecked=0, Total=2256 [2018-01-21 06:07:49,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-01-21 06:07:49,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-01-21 06:07:49,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-01-21 06:07:49,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-01-21 06:07:49,122 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-01-21 06:07:49,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:49,122 INFO L432 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-01-21 06:07:49,122 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 06:07:49,122 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-01-21 06:07:49,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 06:07:49,123 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:49,123 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 06:07:49,123 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:49,123 INFO L82 PathProgramCache]: Analyzing trace with hash -1962099216, now seen corresponding path program 14 times [2018-01-21 06:07:49,123 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:49,124 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:49,124 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:49,124 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:49,124 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:49,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:49,131 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:49,396 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 06:07:49,396 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:49,396 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:49,397 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:49,397 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:49,397 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:49,397 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 06:07:49,410 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:07:49,410 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:49,420 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:49,426 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:49,428 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:49,429 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:49,660 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 06:07:49,661 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:50,094 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 06:07:50,114 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:50,115 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 06:07:50,118 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:07:50,118 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:50,128 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:50,138 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:50,147 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:50,150 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:50,155 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 06:07:50,155 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:50,257 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 06:07:50,258 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:50,258 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-21 06:07:50,258 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:50,259 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 06:07:50,259 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 06:07:50,260 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=1589, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 06:07:50,260 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 34 states. [2018-01-21 06:07:50,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:50,329 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-01-21 06:07:50,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 06:07:50,329 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 32 [2018-01-21 06:07:50,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:50,330 INFO L225 Difference]: With dead ends: 43 [2018-01-21 06:07:50,330 INFO L226 Difference]: Without dead ends: 34 [2018-01-21 06:07:50,331 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=896, Invalid=1654, Unknown=0, NotChecked=0, Total=2550 [2018-01-21 06:07:50,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-01-21 06:07:50,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-01-21 06:07:50,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-01-21 06:07:50,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-01-21 06:07:50,338 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-01-21 06:07:50,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:50,338 INFO L432 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-01-21 06:07:50,338 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 06:07:50,338 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-01-21 06:07:50,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 06:07:50,339 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:50,339 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 06:07:50,339 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:50,340 INFO L82 PathProgramCache]: Analyzing trace with hash 454648299, now seen corresponding path program 15 times [2018-01-21 06:07:50,340 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:50,340 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:50,340 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:50,341 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:50,341 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:50,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:50,348 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:50,591 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 06:07:50,591 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:50,591 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:50,591 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:50,591 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:50,591 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:50,591 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 06:07:50,598 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:07:50,598 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:07:50,605 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:50,609 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:50,610 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:50,612 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:50,613 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:50,615 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:50,616 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:50,617 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:50,618 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:50,619 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:50,620 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:50,782 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 06:07:50,782 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:51,304 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 06:07:51,325 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:51,325 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 06:07:51,328 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:07:51,328 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:07:51,339 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:51,346 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:51,355 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:51,368 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:51,377 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:51,387 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:51,398 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:51,410 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:51,421 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:51,430 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:51,434 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:51,441 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 06:07:51,441 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:51,613 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 06:07:51,614 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:51,614 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 53 [2018-01-21 06:07:51,614 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:51,615 INFO L409 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-01-21 06:07:51,615 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-01-21 06:07:51,615 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=966, Invalid=1790, Unknown=0, NotChecked=0, Total=2756 [2018-01-21 06:07:51,615 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 36 states. [2018-01-21 06:07:51,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:51,678 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-01-21 06:07:51,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-01-21 06:07:51,679 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 33 [2018-01-21 06:07:51,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:51,679 INFO L225 Difference]: With dead ends: 44 [2018-01-21 06:07:51,679 INFO L226 Difference]: Without dead ends: 35 [2018-01-21 06:07:51,680 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1123 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1003, Invalid=1859, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 06:07:51,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-01-21 06:07:51,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-01-21 06:07:51,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-01-21 06:07:51,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-01-21 06:07:51,683 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-01-21 06:07:51,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:51,684 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-01-21 06:07:51,684 INFO L433 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-01-21 06:07:51,684 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-01-21 06:07:51,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 06:07:51,685 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:51,685 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 06:07:51,685 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:51,685 INFO L82 PathProgramCache]: Analyzing trace with hash -1935590064, now seen corresponding path program 16 times [2018-01-21 06:07:51,685 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:51,686 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:51,686 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:51,686 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:51,686 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:51,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:51,694 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:52,010 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 06:07:52,011 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:52,011 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:52,011 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:52,011 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:52,011 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:52,011 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 06:07:52,017 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:07:52,017 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:07:52,031 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:52,033 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:52,167 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 06:07:52,167 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:52,620 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 06:07:52,640 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:52,640 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 06:07:52,643 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:07:52,643 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:07:52,675 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:52,678 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:52,682 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 06:07:52,682 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:52,826 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 06:07:52,827 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:52,827 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 56 [2018-01-21 06:07:52,827 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:52,828 INFO L409 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-01-21 06:07:52,828 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-01-21 06:07:52,829 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1077, Invalid=2003, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 06:07:52,829 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 38 states. [2018-01-21 06:07:52,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:52,905 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-01-21 06:07:52,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 06:07:52,905 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 34 [2018-01-21 06:07:52,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:52,906 INFO L225 Difference]: With dead ends: 45 [2018-01-21 06:07:52,906 INFO L226 Difference]: Without dead ends: 36 [2018-01-21 06:07:52,907 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1116, Invalid=2076, Unknown=0, NotChecked=0, Total=3192 [2018-01-21 06:07:52,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-21 06:07:52,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-21 06:07:52,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-21 06:07:52,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-01-21 06:07:52,911 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-01-21 06:07:52,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:52,911 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-01-21 06:07:52,911 INFO L433 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-01-21 06:07:52,911 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-01-21 06:07:52,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-21 06:07:52,912 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:52,912 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 06:07:52,912 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:52,913 INFO L82 PathProgramCache]: Analyzing trace with hash 1276432011, now seen corresponding path program 17 times [2018-01-21 06:07:52,913 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:52,913 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:52,913 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:52,914 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:52,914 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:52,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:52,922 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:53,159 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 06:07:53,159 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:53,159 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:53,160 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:53,160 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:53,160 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:53,160 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 06:07:53,171 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:07:53,171 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:53,174 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,175 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,176 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,176 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,177 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,178 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,179 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,179 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,180 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,184 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,185 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:53,186 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:53,318 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 06:07:53,318 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:53,906 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 06:07:53,926 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:53,926 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 06:07:53,929 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:07:53,929 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:53,933 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,935 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,938 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,941 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,945 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,949 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,953 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,958 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,964 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,974 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:53,983 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:53,986 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:53,991 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 06:07:53,991 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:54,111 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 06:07:54,112 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:54,112 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 59 [2018-01-21 06:07:54,112 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:54,112 INFO L409 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-01-21 06:07:54,112 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-01-21 06:07:54,113 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2228, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 06:07:54,113 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 40 states. [2018-01-21 06:07:54,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:54,156 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-01-21 06:07:54,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 06:07:54,156 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 35 [2018-01-21 06:07:54,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:54,157 INFO L225 Difference]: With dead ends: 46 [2018-01-21 06:07:54,157 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 06:07:54,158 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 06:07:54,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 06:07:54,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 06:07:54,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 06:07:54,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-01-21 06:07:54,162 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-01-21 06:07:54,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:54,162 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-01-21 06:07:54,162 INFO L433 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-01-21 06:07:54,162 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-01-21 06:07:54,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 06:07:54,163 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:54,163 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 06:07:54,163 INFO L371 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:54,163 INFO L82 PathProgramCache]: Analyzing trace with hash 2064868528, now seen corresponding path program 18 times [2018-01-21 06:07:54,163 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:54,164 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:54,164 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:54,164 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:54,164 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:54,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:54,172 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:54,356 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 06:07:54,356 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:54,357 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:54,357 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:54,357 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:54,357 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:54,357 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 06:07:54,362 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:07:54,362 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:07:54,369 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,371 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,372 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,373 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,374 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,375 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,376 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,377 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,378 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,379 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:54,380 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:54,381 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:54,523 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 06:07:54,523 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:55,065 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 06:07:55,084 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:55,084 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 06:07:55,087 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:07:55,087 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:07:55,096 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,103 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,111 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,119 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,127 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,136 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,145 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,155 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,165 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,176 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:55,184 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:55,187 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:55,192 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:07:55,192 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:55,327 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 06:07:55,328 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:55,328 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 62 [2018-01-21 06:07:55,328 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:55,328 INFO L409 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-01-21 06:07:55,328 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-01-21 06:07:55,329 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1317, Invalid=2465, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 06:07:55,329 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 42 states. [2018-01-21 06:07:55,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:55,379 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-01-21 06:07:55,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 06:07:55,379 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 36 [2018-01-21 06:07:55,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:55,380 INFO L225 Difference]: With dead ends: 47 [2018-01-21 06:07:55,380 INFO L226 Difference]: Without dead ends: 38 [2018-01-21 06:07:55,381 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 06:07:55,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-01-21 06:07:55,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-01-21 06:07:55,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 06:07:55,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-01-21 06:07:55,384 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-01-21 06:07:55,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:55,384 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-01-21 06:07:55,384 INFO L433 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-01-21 06:07:55,385 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-01-21 06:07:55,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 06:07:55,385 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:55,385 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 06:07:55,385 INFO L371 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:55,386 INFO L82 PathProgramCache]: Analyzing trace with hash 736596779, now seen corresponding path program 19 times [2018-01-21 06:07:55,386 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:55,386 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:55,387 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:55,387 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:55,387 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:55,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:55,395 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:55,582 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 06:07:55,600 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:55,600 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:55,601 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:55,601 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:55,601 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:55,601 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 06:07:55,606 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:55,606 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:07:55,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:55,618 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:55,772 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 06:07:55,773 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:56,363 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 06:07:56,383 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:56,383 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 06:07:56,385 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:56,386 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:07:56,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:56,422 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:56,428 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 06:07:56,428 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:56,565 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 06:07:56,566 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:56,566 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 65 [2018-01-21 06:07:56,566 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:56,566 INFO L409 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-01-21 06:07:56,566 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-01-21 06:07:56,567 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1446, Invalid=2714, Unknown=0, NotChecked=0, Total=4160 [2018-01-21 06:07:56,567 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 44 states. [2018-01-21 06:07:56,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:56,609 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-01-21 06:07:56,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 06:07:56,610 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 37 [2018-01-21 06:07:56,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:56,610 INFO L225 Difference]: With dead ends: 48 [2018-01-21 06:07:56,610 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 06:07:56,611 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1491, Invalid=2799, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 06:07:56,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 06:07:56,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 06:07:56,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 06:07:56,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-01-21 06:07:56,613 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-01-21 06:07:56,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:56,613 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-01-21 06:07:56,613 INFO L433 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-01-21 06:07:56,614 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-01-21 06:07:56,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-01-21 06:07:56,614 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:56,614 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 06:07:56,614 INFO L371 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:56,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1785121776, now seen corresponding path program 20 times [2018-01-21 06:07:56,614 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:56,615 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:56,615 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:07:56,615 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:56,615 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:56,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:56,622 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:56,826 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 06:07:56,826 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:56,826 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:56,826 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:56,827 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:56,827 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:56,827 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 06:07:56,832 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:07:56,832 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:56,838 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:56,843 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:56,844 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:56,845 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:57,022 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 06:07:57,022 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:57,654 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 06:07:57,674 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:57,674 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 06:07:57,677 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:07:57,677 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:57,686 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:57,697 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:57,708 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:57,711 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:57,716 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 06:07:57,716 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:57,863 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 06:07:57,864 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:57,864 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 68 [2018-01-21 06:07:57,864 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:57,864 INFO L409 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-01-21 06:07:57,865 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-01-21 06:07:57,865 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1581, Invalid=2975, Unknown=0, NotChecked=0, Total=4556 [2018-01-21 06:07:57,865 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 46 states. [2018-01-21 06:07:57,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:57,910 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-01-21 06:07:57,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 06:07:57,910 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 38 [2018-01-21 06:07:57,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:57,911 INFO L225 Difference]: With dead ends: 49 [2018-01-21 06:07:57,911 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 06:07:57,911 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 06:07:57,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 06:07:57,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 06:07:57,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 06:07:57,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-01-21 06:07:57,914 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-01-21 06:07:57,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:57,915 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-01-21 06:07:57,915 INFO L433 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-01-21 06:07:57,915 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-01-21 06:07:57,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 06:07:57,915 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:57,915 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 06:07:57,915 INFO L371 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:57,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1645981643, now seen corresponding path program 21 times [2018-01-21 06:07:57,916 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:57,916 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:57,917 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:57,917 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:57,917 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:57,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:57,923 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:58,159 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 06:07:58,160 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:58,160 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:58,160 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:58,160 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:58,160 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:58,160 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 06:07:58,165 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:07:58,165 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:07:58,171 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,173 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,174 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,175 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,176 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,177 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,178 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,179 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,180 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,181 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,182 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,183 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:58,183 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:58,185 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:58,365 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 06:07:58,366 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:59,047 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 06:07:59,067 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:59,067 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 06:07:59,070 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:07:59,070 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:07:59,079 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,086 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,094 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,102 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,110 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,119 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,128 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,139 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,149 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,160 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,171 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,182 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:59,191 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:59,194 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:59,199 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 06:07:59,200 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:59,366 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 06:07:59,367 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:59,367 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 71 [2018-01-21 06:07:59,367 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:59,367 INFO L409 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-01-21 06:07:59,368 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-01-21 06:07:59,368 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1722, Invalid=3248, Unknown=0, NotChecked=0, Total=4970 [2018-01-21 06:07:59,368 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 48 states. [2018-01-21 06:07:59,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:59,455 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-01-21 06:07:59,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 06:07:59,456 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 39 [2018-01-21 06:07:59,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:59,456 INFO L225 Difference]: With dead ends: 50 [2018-01-21 06:07:59,456 INFO L226 Difference]: Without dead ends: 41 [2018-01-21 06:07:59,457 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 06:07:59,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-01-21 06:07:59,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-01-21 06:07:59,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 06:07:59,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-01-21 06:07:59,460 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-01-21 06:07:59,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:59,461 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-01-21 06:07:59,461 INFO L433 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-01-21 06:07:59,461 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-01-21 06:07:59,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-01-21 06:07:59,461 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:59,461 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 06:07:59,462 INFO L371 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:59,462 INFO L82 PathProgramCache]: Analyzing trace with hash 636005232, now seen corresponding path program 22 times [2018-01-21 06:07:59,462 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:59,463 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:59,463 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:59,463 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:59,463 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:59,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:59,470 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:59,746 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 06:07:59,746 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:59,747 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:59,747 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:59,747 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:59,747 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:59,747 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 06:07:59,752 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:07:59,752 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:07:59,765 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:59,766 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:59,961 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 06:07:59,961 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:00,749 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 06:08:00,768 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:00,768 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 06:08:00,771 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:00,771 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:00,806 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:00,809 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:00,814 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 06:08:00,815 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:00,972 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 06:08:00,973 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:00,974 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 74 [2018-01-21 06:08:00,974 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:00,974 INFO L409 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-01-21 06:08:00,974 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-01-21 06:08:00,974 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1869, Invalid=3533, Unknown=0, NotChecked=0, Total=5402 [2018-01-21 06:08:00,975 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 50 states. [2018-01-21 06:08:01,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:01,040 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-01-21 06:08:01,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 06:08:01,040 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 40 [2018-01-21 06:08:01,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:01,041 INFO L225 Difference]: With dead ends: 51 [2018-01-21 06:08:01,041 INFO L226 Difference]: Without dead ends: 42 [2018-01-21 06:08:01,041 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 06:08:01,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-01-21 06:08:01,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-01-21 06:08:01,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-01-21 06:08:01,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-01-21 06:08:01,044 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-01-21 06:08:01,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:01,044 INFO L432 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-01-21 06:08:01,045 INFO L433 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-01-21 06:08:01,045 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-01-21 06:08:01,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 06:08:01,045 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:01,045 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 06:08:01,045 INFO L371 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:01,046 INFO L82 PathProgramCache]: Analyzing trace with hash -608492437, now seen corresponding path program 23 times [2018-01-21 06:08:01,046 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:01,046 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:01,046 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:01,046 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:01,046 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:01,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:01,054 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:01,400 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 06:08:01,400 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:01,400 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:01,400 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:01,400 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:01,400 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:01,401 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 06:08:01,405 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:01,405 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:01,409 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,410 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,411 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,412 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,413 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,413 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,414 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,415 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,416 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,417 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,418 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,418 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,423 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:01,424 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:01,426 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:01,634 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 06:08:01,635 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:02,431 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 06:08:02,451 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:02,451 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 06:08:02,454 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:02,454 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:02,458 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,459 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,463 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,466 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,470 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,475 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,479 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,484 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,490 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,497 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,503 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,510 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,522 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:02,532 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:02,535 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:02,541 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 06:08:02,541 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:02,766 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 06:08:02,767 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:02,767 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 77 [2018-01-21 06:08:02,767 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:02,767 INFO L409 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-01-21 06:08:02,768 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-01-21 06:08:02,768 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2022, Invalid=3830, Unknown=0, NotChecked=0, Total=5852 [2018-01-21 06:08:02,768 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 52 states. [2018-01-21 06:08:02,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:02,874 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-01-21 06:08:02,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 06:08:02,874 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 41 [2018-01-21 06:08:02,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:02,874 INFO L225 Difference]: With dead ends: 52 [2018-01-21 06:08:02,874 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 06:08:02,875 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 06:08:02,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 06:08:02,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-21 06:08:02,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 06:08:02,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-01-21 06:08:02,877 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-01-21 06:08:02,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:02,877 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-01-21 06:08:02,877 INFO L433 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-01-21 06:08:02,878 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-01-21 06:08:02,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 06:08:02,878 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:02,878 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 06:08:02,878 INFO L371 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:02,878 INFO L82 PathProgramCache]: Analyzing trace with hash -533214512, now seen corresponding path program 24 times [2018-01-21 06:08:02,878 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:02,879 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:02,879 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:02,879 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:02,879 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:02,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:02,886 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:03,150 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 06:08:03,150 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:03,150 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:03,150 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:03,150 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:03,150 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:03,150 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 06:08:03,155 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:03,155 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:03,162 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,164 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,165 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,166 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,167 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,168 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,169 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,170 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,171 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,172 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,173 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,174 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,176 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:03,176 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:03,177 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:03,400 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 06:08:03,400 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:04,246 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 06:08:04,266 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:04,266 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 06:08:04,269 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:04,269 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:04,278 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,285 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,293 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,301 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,309 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,318 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,327 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,337 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,348 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,358 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,369 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,381 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,393 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:04,403 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:04,406 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:04,412 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 06:08:04,412 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:04,602 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 06:08:04,603 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:04,603 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 80 [2018-01-21 06:08:04,604 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:04,604 INFO L409 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-01-21 06:08:04,605 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-01-21 06:08:04,605 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2181, Invalid=4139, Unknown=0, NotChecked=0, Total=6320 [2018-01-21 06:08:04,605 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 54 states. [2018-01-21 06:08:04,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:04,691 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-01-21 06:08:04,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 06:08:04,691 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 42 [2018-01-21 06:08:04,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:04,691 INFO L225 Difference]: With dead ends: 53 [2018-01-21 06:08:04,691 INFO L226 Difference]: Without dead ends: 44 [2018-01-21 06:08:04,692 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 06:08:04,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-01-21 06:08:04,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-01-21 06:08:04,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 06:08:04,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-01-21 06:08:04,695 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-01-21 06:08:04,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:04,696 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-01-21 06:08:04,696 INFO L433 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-01-21 06:08:04,696 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-01-21 06:08:04,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-01-21 06:08:04,696 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:04,697 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 06:08:04,697 INFO L371 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:04,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1800401163, now seen corresponding path program 25 times [2018-01-21 06:08:04,697 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:04,698 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:04,698 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:04,698 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:04,698 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:04,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:04,707 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:05,013 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 06:08:05,013 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:05,013 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:05,013 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:05,014 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:05,014 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:05,014 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 06:08:05,019 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:05,019 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:05,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:05,032 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:05,272 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 06:08:05,272 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:06,239 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 06:08:06,275 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:06,276 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 06:08:06,278 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:06,278 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:06,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:06,307 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:06,313 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 06:08:06,313 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:06,500 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 06:08:06,501 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:06,502 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 83 [2018-01-21 06:08:06,502 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:06,502 INFO L409 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-01-21 06:08:06,502 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-01-21 06:08:06,502 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=4460, Unknown=0, NotChecked=0, Total=6806 [2018-01-21 06:08:06,503 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 56 states. [2018-01-21 06:08:06,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:06,553 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-01-21 06:08:06,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-21 06:08:06,553 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 43 [2018-01-21 06:08:06,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:06,553 INFO L225 Difference]: With dead ends: 54 [2018-01-21 06:08:06,554 INFO L226 Difference]: Without dead ends: 45 [2018-01-21 06:08:06,554 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 06:08:06,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-01-21 06:08:06,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-01-21 06:08:06,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-01-21 06:08:06,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-01-21 06:08:06,557 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-01-21 06:08:06,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:06,557 INFO L432 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-01-21 06:08:06,557 INFO L433 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-01-21 06:08:06,557 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-01-21 06:08:06,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-21 06:08:06,558 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:06,558 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 06:08:06,558 INFO L371 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:06,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1128043056, now seen corresponding path program 26 times [2018-01-21 06:08:06,558 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:06,559 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:06,559 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:06,559 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:06,559 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:06,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:06,566 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:06,975 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 06:08:06,976 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:06,976 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:06,976 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:06,976 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:06,976 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:06,976 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 06:08:06,986 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:06,987 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:06,995 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:07,001 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:07,003 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:07,005 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:07,326 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 06:08:07,326 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:08,292 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 06:08:08,312 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:08,312 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 06:08:08,315 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:08,315 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:08,325 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:08,339 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:08,351 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:08,354 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:08,360 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 06:08:08,360 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:08,575 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 06:08:08,576 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:08,577 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 86 [2018-01-21 06:08:08,577 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:08,577 INFO L409 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-01-21 06:08:08,577 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-01-21 06:08:08,578 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2517, Invalid=4793, Unknown=0, NotChecked=0, Total=7310 [2018-01-21 06:08:08,578 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 58 states. [2018-01-21 06:08:08,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:08,641 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-01-21 06:08:08,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-01-21 06:08:08,641 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 44 [2018-01-21 06:08:08,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:08,641 INFO L225 Difference]: With dead ends: 55 [2018-01-21 06:08:08,641 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 06:08:08,642 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 06:08:08,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 06:08:08,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-01-21 06:08:08,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 06:08:08,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-01-21 06:08:08,645 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-01-21 06:08:08,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:08,645 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-01-21 06:08:08,645 INFO L433 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-01-21 06:08:08,645 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-01-21 06:08:08,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-01-21 06:08:08,646 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:08,646 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 06:08:08,646 INFO L371 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:08,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1759778219, now seen corresponding path program 27 times [2018-01-21 06:08:08,646 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:08,647 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:08,647 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:08,647 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:08,647 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:08,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:08,655 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:09,076 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 06:08:09,076 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:09,076 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:09,077 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:09,077 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:09,077 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:09,077 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 06:08:09,082 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:09,082 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:09,089 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,091 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,093 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,094 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,096 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,097 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,099 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,100 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,101 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,102 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,104 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,105 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,106 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,107 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,108 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:09,109 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:09,110 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:09,380 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 06:08:09,380 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:10,421 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 06:08:10,441 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:10,441 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 06:08:10,444 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:10,444 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:10,453 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,460 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,468 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,476 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,484 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,493 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,503 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,513 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,523 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,535 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,546 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,558 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,570 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,582 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,596 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:10,606 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:10,609 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:10,615 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 06:08:10,616 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:10,833 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 06:08:10,834 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:10,834 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 89 [2018-01-21 06:08:10,834 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:10,834 INFO L409 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-01-21 06:08:10,835 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-01-21 06:08:10,835 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2694, Invalid=5138, Unknown=0, NotChecked=0, Total=7832 [2018-01-21 06:08:10,835 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 60 states. [2018-01-21 06:08:10,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:10,890 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-01-21 06:08:10,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 06:08:10,890 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 45 [2018-01-21 06:08:10,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:10,890 INFO L225 Difference]: With dead ends: 56 [2018-01-21 06:08:10,890 INFO L226 Difference]: Without dead ends: 47 [2018-01-21 06:08:10,891 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3319 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2755, Invalid=5255, Unknown=0, NotChecked=0, Total=8010 [2018-01-21 06:08:10,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-01-21 06:08:10,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-01-21 06:08:10,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 06:08:10,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-01-21 06:08:10,894 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-01-21 06:08:10,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:10,894 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-01-21 06:08:10,894 INFO L433 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-01-21 06:08:10,894 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-01-21 06:08:10,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 06:08:10,895 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:10,895 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 06:08:10,895 INFO L371 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:10,895 INFO L82 PathProgramCache]: Analyzing trace with hash -131268208, now seen corresponding path program 28 times [2018-01-21 06:08:10,895 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:10,896 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:10,896 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:10,896 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:10,896 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:10,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:10,904 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:11,244 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 06:08:11,244 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:11,279 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:11,279 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:11,279 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:11,279 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:11,279 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 06:08:11,286 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:11,286 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:11,301 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:11,302 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:11,607 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 06:08:11,607 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:12,706 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 06:08:12,726 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:12,726 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 06:08:12,729 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:12,729 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:12,767 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:12,771 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:12,783 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 06:08:12,784 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:13,019 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 06:08:13,020 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:13,021 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 92 [2018-01-21 06:08:13,021 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:13,021 INFO L409 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-01-21 06:08:13,021 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-01-21 06:08:13,022 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2877, Invalid=5495, Unknown=0, NotChecked=0, Total=8372 [2018-01-21 06:08:13,022 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 62 states. [2018-01-21 06:08:13,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:13,085 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-01-21 06:08:13,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 06:08:13,085 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 46 [2018-01-21 06:08:13,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:13,086 INFO L225 Difference]: With dead ends: 57 [2018-01-21 06:08:13,086 INFO L226 Difference]: Without dead ends: 48 [2018-01-21 06:08:13,086 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3554 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2940, Invalid=5616, Unknown=0, NotChecked=0, Total=8556 [2018-01-21 06:08:13,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-01-21 06:08:13,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-01-21 06:08:13,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 06:08:13,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-01-21 06:08:13,089 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-01-21 06:08:13,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:13,089 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-01-21 06:08:13,089 INFO L433 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-01-21 06:08:13,089 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-01-21 06:08:13,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 06:08:13,090 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:13,090 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 06:08:13,090 INFO L371 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:13,090 INFO L82 PathProgramCache]: Analyzing trace with hash 1375834699, now seen corresponding path program 29 times [2018-01-21 06:08:13,090 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:13,091 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:13,091 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:13,091 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:13,091 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:13,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:13,102 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:13,498 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 06:08:13,498 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:13,498 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:13,498 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:13,499 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:13,499 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:13,499 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 06:08:13,503 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:13,504 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:13,508 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,508 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,509 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,510 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,511 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,511 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,512 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,513 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,514 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,515 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,515 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,516 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,517 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,518 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,519 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,523 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:13,524 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:13,526 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:13,836 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 06:08:13,836 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:15,009 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 06:08:15,028 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:15,028 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 06:08:15,032 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:15,032 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:15,036 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,038 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,041 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,044 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,048 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,053 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,058 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,063 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,069 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,075 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,081 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,088 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,095 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,103 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,111 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,125 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:15,136 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:15,139 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:15,145 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 06:08:15,146 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:15,385 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 06:08:15,386 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:15,386 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 95 [2018-01-21 06:08:15,386 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:15,387 INFO L409 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-01-21 06:08:15,387 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-01-21 06:08:15,387 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3066, Invalid=5864, Unknown=0, NotChecked=0, Total=8930 [2018-01-21 06:08:15,387 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 64 states. [2018-01-21 06:08:15,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:15,456 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-01-21 06:08:15,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-21 06:08:15,457 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 47 [2018-01-21 06:08:15,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:15,457 INFO L225 Difference]: With dead ends: 58 [2018-01-21 06:08:15,457 INFO L226 Difference]: Without dead ends: 49 [2018-01-21 06:08:15,458 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 06:08:15,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-21 06:08:15,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-01-21 06:08:15,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-01-21 06:08:15,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-01-21 06:08:15,461 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-01-21 06:08:15,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:15,461 INFO L432 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-01-21 06:08:15,461 INFO L433 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-01-21 06:08:15,461 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-01-21 06:08:15,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-01-21 06:08:15,462 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:15,462 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 06:08:15,462 INFO L371 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:15,462 INFO L82 PathProgramCache]: Analyzing trace with hash 851384560, now seen corresponding path program 30 times [2018-01-21 06:08:15,462 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:15,463 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:15,463 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:15,463 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:15,463 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:15,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:15,470 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:15,850 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 06:08:15,850 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:15,851 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:15,851 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:15,851 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:15,851 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:15,851 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 06:08:15,855 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:15,856 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:15,862 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,864 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,865 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,866 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,867 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,868 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,869 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,870 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,871 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,872 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,873 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,874 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,875 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,876 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,878 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,879 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:15,879 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:15,881 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:16,203 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 06:08:16,203 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:17,529 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 06:08:17,549 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:17,549 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 06:08:17,552 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:08:17,552 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:08:17,562 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,569 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,577 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,585 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,593 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,602 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,612 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,622 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,632 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,642 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,653 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,665 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,677 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,690 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,703 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,716 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:08:17,727 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:17,730 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:17,737 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 06:08:17,737 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:18,034 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 06:08:18,035 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:18,035 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 98 [2018-01-21 06:08:18,035 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:18,035 INFO L409 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-01-21 06:08:18,035 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-01-21 06:08:18,036 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3261, Invalid=6245, Unknown=0, NotChecked=0, Total=9506 [2018-01-21 06:08:18,036 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 66 states. [2018-01-21 06:08:18,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:18,110 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-01-21 06:08:18,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-01-21 06:08:18,110 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 48 [2018-01-21 06:08:18,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:18,110 INFO L225 Difference]: With dead ends: 59 [2018-01-21 06:08:18,110 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 06:08:18,111 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4048 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3328, Invalid=6374, Unknown=0, NotChecked=0, Total=9702 [2018-01-21 06:08:18,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 06:08:18,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-01-21 06:08:18,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 06:08:18,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-01-21 06:08:18,113 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-01-21 06:08:18,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:18,113 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-01-21 06:08:18,113 INFO L433 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-01-21 06:08:18,113 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-01-21 06:08:18,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-21 06:08:18,114 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:18,114 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 06:08:18,114 INFO L371 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:18,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1773299435, now seen corresponding path program 31 times [2018-01-21 06:08:18,114 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:18,115 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:18,115 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:18,115 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:18,115 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:18,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:18,128 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:18,621 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 06:08:18,621 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:18,621 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:18,621 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:18,621 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:18,621 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:18,621 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 06:08:18,626 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:18,626 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:18,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:18,641 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:18,987 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 06:08:18,988 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:20,298 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 06:08:20,318 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:20,318 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 06:08:20,321 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:20,321 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:08:20,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:20,353 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:20,360 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 06:08:20,360 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:20,613 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 06:08:20,613 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:20,614 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 101 [2018-01-21 06:08:20,614 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:20,614 INFO L409 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-01-21 06:08:20,614 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-01-21 06:08:20,615 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3462, Invalid=6638, Unknown=0, NotChecked=0, Total=10100 [2018-01-21 06:08:20,615 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 68 states. [2018-01-21 06:08:20,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:20,672 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-01-21 06:08:20,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 06:08:20,672 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 49 [2018-01-21 06:08:20,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:20,673 INFO L225 Difference]: With dead ends: 60 [2018-01-21 06:08:20,673 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 06:08:20,673 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4307 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3531, Invalid=6771, Unknown=0, NotChecked=0, Total=10302 [2018-01-21 06:08:20,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 06:08:20,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-01-21 06:08:20,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-01-21 06:08:20,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-01-21 06:08:20,675 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-01-21 06:08:20,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:20,676 INFO L432 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-01-21 06:08:20,676 INFO L433 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-01-21 06:08:20,676 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-01-21 06:08:20,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-01-21 06:08:20,676 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:20,676 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 06:08:20,676 INFO L371 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:20,676 INFO L82 PathProgramCache]: Analyzing trace with hash 287889488, now seen corresponding path program 32 times [2018-01-21 06:08:20,676 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:20,677 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:20,677 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:08:20,677 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:20,677 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:20,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:20,689 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:21,221 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 06:08:21,221 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:21,221 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:21,221 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:21,221 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:21,221 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:21,221 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 06:08:21,226 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:21,226 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:21,233 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:21,240 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:21,241 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:21,243 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:21,615 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 06:08:21,615 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:23,057 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 06:08:23,076 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:23,077 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 06:08:23,079 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:08:23,079 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:23,090 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:23,105 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:23,118 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:23,122 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:23,130 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 06:08:23,130 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:23,408 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 06:08:23,410 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:23,410 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 104 [2018-01-21 06:08:23,410 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:23,410 INFO L409 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-01-21 06:08:23,411 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-01-21 06:08:23,411 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3669, Invalid=7043, Unknown=0, NotChecked=0, Total=10712 [2018-01-21 06:08:23,411 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 70 states. [2018-01-21 06:08:23,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:23,576 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-01-21 06:08:23,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-01-21 06:08:23,576 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 50 [2018-01-21 06:08:23,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:23,577 INFO L225 Difference]: With dead ends: 61 [2018-01-21 06:08:23,577 INFO L226 Difference]: Without dead ends: 52 [2018-01-21 06:08:23,577 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 06:08:23,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-01-21 06:08:23,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-01-21 06:08:23,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-21 06:08:23,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-01-21 06:08:23,579 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-01-21 06:08:23,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:23,580 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-01-21 06:08:23,580 INFO L433 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-01-21 06:08:23,580 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-01-21 06:08:23,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-01-21 06:08:23,580 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:23,581 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 06:08:23,581 INFO L371 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:23,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1484821387, now seen corresponding path program 33 times [2018-01-21 06:08:23,581 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:23,582 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:23,582 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:23,582 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:23,582 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:23,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:23,595 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:24,056 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 06:08:24,056 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:24,056 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:24,056 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:24,056 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:24,056 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:24,057 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 06:08:24,061 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:24,061 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:24,068 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,070 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,071 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,072 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,073 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,074 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,075 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,076 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,077 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,078 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,079 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,080 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,081 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,082 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,083 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,085 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,086 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,087 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:24,087 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:24,089 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:24,467 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 06:08:24,467 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:25,939 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 06:08:25,959 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:25,959 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 06:08:25,961 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:08:25,962 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:08:25,972 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:25,978 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:25,986 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:25,994 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,003 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,012 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,022 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,032 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,043 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,054 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,065 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,077 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,090 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,103 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,117 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,131 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,146 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,161 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:08:26,173 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:26,177 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:26,184 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 06:08:26,184 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:26,470 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 06:08:26,471 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:26,472 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 107 [2018-01-21 06:08:26,472 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:26,472 INFO L409 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-01-21 06:08:26,472 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-01-21 06:08:26,473 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3882, Invalid=7460, Unknown=0, NotChecked=0, Total=11342 [2018-01-21 06:08:26,473 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 72 states. [2018-01-21 06:08:26,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:26,566 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-01-21 06:08:26,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-01-21 06:08:26,566 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 51 [2018-01-21 06:08:26,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:26,567 INFO L225 Difference]: With dead ends: 62 [2018-01-21 06:08:26,567 INFO L226 Difference]: Without dead ends: 53 [2018-01-21 06:08:26,568 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4849 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3955, Invalid=7601, Unknown=0, NotChecked=0, Total=11556 [2018-01-21 06:08:26,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-01-21 06:08:26,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-01-21 06:08:26,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-21 06:08:26,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-01-21 06:08:26,571 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-01-21 06:08:26,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:26,571 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-01-21 06:08:26,572 INFO L433 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-01-21 06:08:26,572 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-01-21 06:08:26,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 06:08:26,572 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:26,572 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 06:08:26,572 INFO L371 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:26,573 INFO L82 PathProgramCache]: Analyzing trace with hash -64995408, now seen corresponding path program 34 times [2018-01-21 06:08:26,573 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:26,573 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:26,573 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:26,574 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:26,574 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:26,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:26,587 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:27,150 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 06:08:27,150 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:27,150 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:27,150 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:27,150 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:27,150 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:27,150 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 06:08:27,155 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:27,155 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:27,170 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:27,172 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:27,570 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 06:08:27,571 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:29,147 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 06:08:29,167 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:29,167 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 06:08:29,170 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:08:29,170 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:08:29,217 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:29,221 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:29,232 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 06:08:29,232 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:29,564 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 06:08:29,565 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:29,566 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 110 [2018-01-21 06:08:29,566 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:29,566 INFO L409 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-01-21 06:08:29,566 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-01-21 06:08:29,567 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=4101, Invalid=7889, Unknown=0, NotChecked=0, Total=11990 [2018-01-21 06:08:29,567 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 74 states. [2018-01-21 06:08:29,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:29,621 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-01-21 06:08:29,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-21 06:08:29,621 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 52 [2018-01-21 06:08:29,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:29,622 INFO L225 Difference]: With dead ends: 63 [2018-01-21 06:08:29,622 INFO L226 Difference]: Without dead ends: 54 [2018-01-21 06:08:29,622 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 06:08:29,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-01-21 06:08:29,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-01-21 06:08:29,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-01-21 06:08:29,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-01-21 06:08:29,625 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-01-21 06:08:29,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:29,625 INFO L432 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-01-21 06:08:29,625 INFO L433 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-01-21 06:08:29,625 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-01-21 06:08:29,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-01-21 06:08:29,626 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:29,626 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 06:08:29,626 INFO L371 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:29,626 INFO L82 PathProgramCache]: Analyzing trace with hash -864675797, now seen corresponding path program 35 times [2018-01-21 06:08:29,626 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:29,627 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:29,627 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:29,627 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:29,627 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:29,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:29,635 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:08:30,221 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 06:08:30,221 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:30,221 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:08:30,221 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:08:30,221 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:08:30,221 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:30,221 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 06:08:30,226 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:30,226 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:30,230 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,231 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,231 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,232 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,233 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,233 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,234 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,235 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,236 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,237 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,238 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,239 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,240 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,241 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,242 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,243 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,244 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,245 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,248 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:30,249 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:30,251 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:30,666 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 06:08:30,666 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:32,284 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 06:08:32,304 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:08:32,304 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 71 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:08:32,306 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:08:32,307 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:08:32,317 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,320 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,325 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,331 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,337 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,344 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,352 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,361 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,370 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,381 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,391 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,402 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,414 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,427 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,440 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,453 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,468 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,482 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,505 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:08:32,524 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:08:32,528 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:08:32,537 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 06:08:32,537 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:08:32,829 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 06:08:32,830 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:08:32,830 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 113 [2018-01-21 06:08:32,830 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:08:32,830 INFO L409 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-01-21 06:08:32,831 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-01-21 06:08:32,831 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=4326, Invalid=8330, Unknown=0, NotChecked=0, Total=12656 [2018-01-21 06:08:32,831 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 76 states. [2018-01-21 06:08:32,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:08:32,896 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-01-21 06:08:32,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-01-21 06:08:32,896 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 53 [2018-01-21 06:08:32,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:08:32,897 INFO L225 Difference]: With dead ends: 64 [2018-01-21 06:08:32,897 INFO L226 Difference]: Without dead ends: 55 [2018-01-21 06:08:32,898 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 136 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5423 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4403, Invalid=8479, Unknown=0, NotChecked=0, Total=12882 [2018-01-21 06:08:32,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-21 06:08:32,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-01-21 06:08:32,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-21 06:08:32,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-01-21 06:08:32,901 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2018-01-21 06:08:32,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:08:32,901 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-01-21 06:08:32,901 INFO L433 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-01-21 06:08:32,901 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-01-21 06:08:32,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-01-21 06:08:32,902 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:08:32,902 INFO L322 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:08:32,902 INFO L371 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:08:32,902 INFO L82 PathProgramCache]: Analyzing trace with hash 115035920, now seen corresponding path program 36 times [2018-01-21 06:08:32,903 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:08:32,903 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:32,903 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:08:32,903 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:08:32,903 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:08:32,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:08:32,917 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. Received shutdown request... [2018-01-21 06:08:33,031 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 06:08:33,033 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:08:33,033 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:08:33,033 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:08:33,033 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:08:33,033 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:08:33,033 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:08:33,033 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:08:33,033 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 06:08:33,033 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:08:33,033 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 06:08:33,034 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 06:08:33,034 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.01 06:08:33 BoogieIcfgContainer [2018-01-21 06:08:33,034 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-01-21 06:08:33,035 INFO L168 Benchmark]: Toolchain (without parser) took 54249.12 ms. Allocated memory was 304.1 MB in the beginning and 856.2 MB in the end (delta: 552.1 MB). Free memory was 263.4 MB in the beginning and 356.0 MB in the end (delta: -92.6 MB). Peak memory consumption was 459.5 MB. Max. memory is 5.3 GB. [2018-01-21 06:08:33,035 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 304.1 MB. Free memory is still 268.4 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-21 06:08:33,036 INFO L168 Benchmark]: CACSL2BoogieTranslator took 176.40 ms. Allocated memory is still 304.1 MB. Free memory was 262.4 MB in the beginning and 255.3 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 MB. Max. memory is 5.3 GB. [2018-01-21 06:08:33,036 INFO L168 Benchmark]: Boogie Preprocessor took 29.78 ms. Allocated memory is still 304.1 MB. Free memory was 255.3 MB in the beginning and 253.3 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-21 06:08:33,036 INFO L168 Benchmark]: RCFGBuilder took 193.25 ms. Allocated memory is still 304.1 MB. Free memory was 253.3 MB in the beginning and 241.7 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. [2018-01-21 06:08:33,036 INFO L168 Benchmark]: TraceAbstraction took 53843.26 ms. Allocated memory was 304.1 MB in the beginning and 856.2 MB in the end (delta: 552.1 MB). Free memory was 240.7 MB in the beginning and 356.0 MB in the end (delta: -115.3 MB). Peak memory consumption was 436.8 MB. Max. memory is 5.3 GB. [2018-01-21 06:08:33,037 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 304.1 MB. Free memory is still 268.4 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 176.40 ms. Allocated memory is still 304.1 MB. Free memory was 262.4 MB in the beginning and 255.3 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 29.78 ms. Allocated memory is still 304.1 MB. Free memory was 255.3 MB in the beginning and 253.3 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 193.25 ms. Allocated memory is still 304.1 MB. Free memory was 253.3 MB in the beginning and 241.7 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. * TraceAbstraction took 53843.26 ms. Allocated memory was 304.1 MB in the beginning and 856.2 MB in the end (delta: 552.1 MB). Free memory was 240.7 MB in the beginning and 356.0 MB in the end (delta: -115.3 MB). Peak memory consumption was 436.8 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) : 0.195708 RENAME_VARIABLES(MILLISECONDS) : 0.078514 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 0.149652 PROJECTAWAY(MILLISECONDS) : 0.074672 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.073007 DISJOIN(MILLISECONDS) : 0.000000 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.110934 ADD_EQUALITY(MILLISECONDS) : 0.037317 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.013795 #CONJOIN_DISJUNCTIVE : 34 #RENAME_VARIABLES : 64 #UNFREEZE : 0 #CONJOIN : 64 #PROJECTAWAY : 66 #ADD_WEAK_EQUALITY : 4 #DISJOIN : 0 #RENAME_VARIABLES_DISJUNCTIVE : 64 #ADD_EQUALITY : 35 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 2 * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 1]: not all allocated memory was freed not all allocated memory was freed We found a FailurePath: - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.initErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. UNSAFE Result, 0.1s OverallTime, 1 OverallIterations, 1 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 3 NumberOfCodeBlocks, 3 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 1]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 1). Cancelled while BasicCegarLoop was analyzing trace of length 55 with TraceHistMax 36, while InterpolatingTraceCheckCraig was constructing Craig interpolants, while PredicateComparison was comparing new predicate (quantifier-free) to 12 known predicates. - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.startErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 53.5s OverallTime, 37 OverallIterations, 36 TraceHistogramMax, 2.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 615 SDtfs, 117 SDslu, 11554 SDs, 0 SdLazy, 2569 SolverSat, 135 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5780 GetRequests, 3572 SyntacticMatches, 70 SemanticMatches, 2138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69020 ImplicationChecksByTransitivity, 32.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=55occurred in iteration=36, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.7s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 36 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 3.0s SatisfiabilityAnalysisTime, 45.4s InterpolantComputationTime, 3798 NumberOfCodeBlocks, 3798 NumberOfCodeBlocksAsserted, 460 NumberOfCheckSat, 6142 ConstructedInterpolants, 0 QuantifiedInterpolants, 973390 SizeOfPredicates, 70 NumberOfNonLiveVariables, 8330 ConjunctsInSsa, 1470 ConjunctsInUnsatCore, 176 InterpolantComputations, 1 PerfectInterpolantSequences, 0/38850 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 25]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 25). Cancelled while IsEmpty was searching accepting run (input had 22 states). - StatisticsResult: Ultimate Automizer benchmark data for error location: mainErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 0.0s OverallTime, 0 OverallIterations, 0 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, REUSE_STATISTICS: No data available RESULT: Ultimate proved your program to be incorrect! Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-Benchmark-0-2018-01-21_06-08-33-046.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-VPDomainBenchmark-0-2018-01-21_06-08-33-046.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-BenchmarkWithCounters-0-2018-01-21_06-08-33-046.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-0-2018-01-21_06-08-33-046.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-1-2018-01-21_06-08-33-046.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-2-2018-01-21_06-08-33-046.csv Completed graceful shutdown