java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:34:19,769 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:34:19,771 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:34:19,785 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:34:19,786 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:34:19,786 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:34:19,787 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:34:19,788 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:34:19,790 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:34:19,790 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:34:19,791 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:34:19,791 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:34:19,792 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:34:19,793 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:34:19,794 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:34:19,797 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:34:19,799 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:34:19,801 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:34:19,802 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:34:19,803 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:34:19,806 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 10:34:19,810 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:34:19,811 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:34:19,811 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf [2018-01-21 10:34:19,821 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:34:19,822 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:34:19,822 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:34:19,823 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:34:19,823 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:34:19,823 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:34:19,823 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:34:19,823 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:34:19,824 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:34:19,824 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:34:19,824 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:34:19,825 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:34:19,825 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:34:19,825 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:34:19,825 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:34:19,825 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:34:19,826 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:34:19,826 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:34:19,826 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:34:19,826 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:34:19,826 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:34:19,827 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:34:19,827 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:34:19,827 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:34:19,827 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:34:19,827 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:34:19,827 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:34:19,828 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:34:19,828 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:34:19,828 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:34:19,828 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:34:19,828 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:34:19,829 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:34:19,829 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:34:19,829 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:34:19,829 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:34:19,829 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:34:19,830 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:34:19,830 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:34:19,863 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:34:19,872 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:34:19,875 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:34:19,877 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:34:19,877 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:34:19,878 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 10:34:20,011 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:34:20,017 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:34:20,040 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:34:20,041 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:34:20,046 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:34:20,047 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:34:20" (1/1) ... [2018-01-21 10:34:20,050 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1285ed85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20, skipping insertion in model container [2018-01-21 10:34:20,051 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:34:20" (1/1) ... [2018-01-21 10:34:20,069 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:34:20,084 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:34:20,183 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:34:20,197 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:34:20,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20 WrapperNode [2018-01-21 10:34:20,204 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:34:20,205 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:34:20,205 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:34:20,205 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:34:20,221 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20" (1/1) ... [2018-01-21 10:34:20,221 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20" (1/1) ... [2018-01-21 10:34:20,232 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20" (1/1) ... [2018-01-21 10:34:20,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20" (1/1) ... [2018-01-21 10:34:20,235 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20" (1/1) ... [2018-01-21 10:34:20,237 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20" (1/1) ... [2018-01-21 10:34:20,238 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20" (1/1) ... [2018-01-21 10:34:20,240 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:34:20,240 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:34:20,240 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:34:20,240 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:34:20,241 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:34:20,285 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:34:20,285 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:34:20,286 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 10:34:20,286 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:34:20,286 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:34:20,286 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:34:20,286 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:34:20,286 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:34:20,287 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:34:20,287 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 10:34:20,287 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:34:20,287 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:34:20,287 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:34:20,441 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:34:20,441 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:34:20 BoogieIcfgContainer [2018-01-21 10:34:20,442 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:34:20,442 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:34:20,442 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:34:20,444 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:34:20,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:34:20" (1/3) ... [2018-01-21 10:34:20,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15216911 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:34:20, skipping insertion in model container [2018-01-21 10:34:20,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:34:20" (2/3) ... [2018-01-21 10:34:20,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15216911 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:34:20, skipping insertion in model container [2018-01-21 10:34:20,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:34:20" (3/3) ... [2018-01-21 10:34:20,447 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 10:34:20,453 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:34:20,458 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 10:34:20,503 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:34:20,504 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:34:20,504 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:34:20,504 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:34:20,504 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:34:20,504 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:34:20,504 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:34:20,505 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:34:20,505 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:34:20,524 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:34:20,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:34:20,529 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:20,530 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:34:20,531 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:34:20,535 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 10:34:20,537 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:20,576 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:20,577 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:20,577 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:20,577 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:20,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:34:20,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:34:20,632 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:34:20,638 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:34:20,644 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:34:20,644 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:34:20,644 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:34:20,644 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:34:20,644 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:34:20,645 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:34:20,645 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:34:20,645 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 10:34:20,645 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:34:20,647 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:34:20,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 10:34:20,649 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:20,649 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:20,649 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 10:34:20,649 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 10:34:20,649 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:20,651 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:20,651 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:20,651 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:20,651 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:20,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:20,676 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:20,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:20,709 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:34:20,709 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:34:20,709 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:34:20,711 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:34:20,721 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:34:20,721 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:34:20,723 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:34:20,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:20,745 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:34:20,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:34:20,747 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 10:34:20,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:20,753 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:34:20,754 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 10:34:20,757 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:34:20,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 10:34:20,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 10:34:20,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 10:34:20,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 10:34:20,850 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 10:34:20,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:20,850 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 10:34:20,850 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:34:20,850 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 10:34:20,850 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 10:34:20,853 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:34:20,853 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:34:20,853 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:34:20,853 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:34:20,853 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:34:20,853 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:34:20,854 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:34:20,854 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:34:20,854 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:34:20,856 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:34:20,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 10:34:20,857 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:20,858 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:20,858 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:20,858 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 10:34:20,858 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:20,859 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:20,859 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:20,859 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:20,860 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:20,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:20,869 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:20,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:20,882 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:34:20,882 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:34:20,883 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:34:20,883 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:34:20,883 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:34:20,883 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:34:20,884 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:34:20,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:20,890 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:34:20,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:34:20,890 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 10:34:20,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:20,892 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:34:20,893 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 10:34:20,893 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:34:20,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 10:34:20,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 10:34:20,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 10:34:20,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 10:34:20,907 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 10:34:20,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:20,907 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 10:34:20,907 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:34:20,907 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 10:34:20,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 10:34:20,908 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:20,908 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:20,909 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:20,909 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 10:34:20,909 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:20,910 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:20,910 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:20,911 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:20,911 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:20,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:20,924 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:20,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:20,964 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:34:20,964 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:34:20,964 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:34:20,966 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:34:20,967 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:34:20,967 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:34:20,967 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 10:34:21,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:21,029 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 10:34:21,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:34:21,030 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 10:34:21,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:21,034 INFO L225 Difference]: With dead ends: 66 [2018-01-21 10:34:21,034 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 10:34:21,035 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:34:21,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 10:34:21,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 10:34:21,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 10:34:21,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 10:34:21,048 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 10:34:21,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:21,049 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 10:34:21,049 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:34:21,049 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 10:34:21,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 10:34:21,050 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:21,050 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:21,050 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:21,051 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 10:34:21,051 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:21,052 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:21,052 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:21,052 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:21,052 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:21,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:21,069 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:21,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:21,198 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:21,199 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:21,200 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 10:34:21,201 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 10:34:21,243 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:34:21,244 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:34:22,556 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:34:22,558 INFO L268 AbstractInterpreter]: Visited 30 different actions 82 times. Merged at 14 different actions 31 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 18 variables. [2018-01-21 10:34:22,566 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:34:22,566 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:22,566 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:22,576 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:22,576 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:22,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:22,609 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:22,647 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:22,647 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:22,732 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:22,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:22,767 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 10:34:22,774 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:22,774 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:22,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:22,809 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:22,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:22,816 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:22,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:34:22,850 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:22,850 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4, 4, 4] total 12 [2018-01-21 10:34:22,850 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:22,851 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:34:22,851 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:34:22,851 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-01-21 10:34:22,851 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-01-21 10:34:23,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:23,127 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2018-01-21 10:34:23,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 10:34:23,127 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-01-21 10:34:23,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:23,129 INFO L225 Difference]: With dead ends: 96 [2018-01-21 10:34:23,129 INFO L226 Difference]: Without dead ends: 79 [2018-01-21 10:34:23,130 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:34:23,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-01-21 10:34:23,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 50. [2018-01-21 10:34:23,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 10:34:23,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-01-21 10:34:23,138 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 31 [2018-01-21 10:34:23,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:23,139 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-01-21 10:34:23,139 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:34:23,139 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-01-21 10:34:23,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 10:34:23,141 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:23,141 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:23,141 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:23,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1947199059, now seen corresponding path program 2 times [2018-01-21 10:34:23,142 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:23,143 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:23,143 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:23,143 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:23,143 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:23,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:23,160 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:23,204 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 10:34:23,205 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:23,205 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:23,205 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:23,205 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:23,205 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:23,206 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 10:34:23,221 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:23,221 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:23,236 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:23,246 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:23,248 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:23,251 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:23,314 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 10:34:23,314 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:23,426 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 10:34:23,460 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 10:34:23,460 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-21 10:34:23,460 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:34:23,461 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 10:34:23,461 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 10:34:23,461 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-21 10:34:23,461 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-01-21 10:34:23,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:23,603 INFO L93 Difference]: Finished difference Result 98 states and 109 transitions. [2018-01-21 10:34:23,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 10:34:23,604 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2018-01-21 10:34:23,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:23,605 INFO L225 Difference]: With dead ends: 98 [2018-01-21 10:34:23,605 INFO L226 Difference]: Without dead ends: 63 [2018-01-21 10:34:23,606 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 10:34:23,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-01-21 10:34:23,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2018-01-21 10:34:23,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-21 10:34:23,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2018-01-21 10:34:23,613 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 42 [2018-01-21 10:34:23,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:23,613 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2018-01-21 10:34:23,614 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 10:34:23,614 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2018-01-21 10:34:23,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 10:34:23,615 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:23,616 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:23,616 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:23,616 INFO L82 PathProgramCache]: Analyzing trace with hash 84514625, now seen corresponding path program 1 times [2018-01-21 10:34:23,616 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:23,617 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:23,617 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:23,617 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:23,618 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:23,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:23,635 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:23,696 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 10:34:23,697 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:23,697 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:23,697 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 48 with the following transitions: [2018-01-21 10:34:23,697 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 10:34:23,699 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:34:23,699 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:34:24,546 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:34:24,547 INFO L268 AbstractInterpreter]: Visited 34 different actions 110 times. Merged at 22 different actions 51 times. Never widened. Found 9 fixpoints after 5 different actions. Largest state had 21 variables. [2018-01-21 10:34:24,548 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:34:24,548 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:24,549 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:24,556 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:24,556 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:24,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:24,584 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:24,606 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 10:34:24,607 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:24,659 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 10:34:24,693 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:24,693 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:24,700 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:24,700 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:24,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:24,745 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:24,752 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 10:34:24,753 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:24,786 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 10:34:24,788 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:24,788 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 10:34:24,789 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:24,789 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 10:34:24,789 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 10:34:24,789 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 10:34:24,790 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand 6 states. [2018-01-21 10:34:24,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:24,927 INFO L93 Difference]: Finished difference Result 105 states and 119 transitions. [2018-01-21 10:34:24,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 10:34:24,928 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-21 10:34:24,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:24,930 INFO L225 Difference]: With dead ends: 105 [2018-01-21 10:34:24,930 INFO L226 Difference]: Without dead ends: 84 [2018-01-21 10:34:24,930 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 10:34:24,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-01-21 10:34:24,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 64. [2018-01-21 10:34:24,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-01-21 10:34:24,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2018-01-21 10:34:24,939 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 47 [2018-01-21 10:34:24,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:24,939 INFO L432 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2018-01-21 10:34:24,940 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 10:34:24,940 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2018-01-21 10:34:24,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-01-21 10:34:24,942 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:24,942 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:24,942 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:24,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1267511486, now seen corresponding path program 2 times [2018-01-21 10:34:24,942 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:24,943 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:24,943 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:24,943 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:24,944 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:24,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:24,963 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:25,057 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:34:25,057 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:25,084 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:25,084 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:25,084 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:25,084 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:25,084 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:25,092 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:25,092 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:25,106 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:25,123 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:25,126 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:25,130 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:25,228 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 10:34:25,229 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:25,426 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 10:34:25,460 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:25,460 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:25,466 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:25,466 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:25,479 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:25,500 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:25,513 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:25,518 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:25,567 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:34:25,567 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:25,747 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:34:25,749 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:25,750 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 10:34:25,750 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:25,750 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 10:34:25,751 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 10:34:25,751 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-21 10:34:25,751 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand 12 states. [2018-01-21 10:34:25,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:25,962 INFO L93 Difference]: Finished difference Result 172 states and 198 transitions. [2018-01-21 10:34:25,963 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 10:34:25,963 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 63 [2018-01-21 10:34:25,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:25,965 INFO L225 Difference]: With dead ends: 172 [2018-01-21 10:34:25,965 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 10:34:25,968 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 234 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-21 10:34:25,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 10:34:25,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 89. [2018-01-21 10:34:25,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-01-21 10:34:25,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2018-01-21 10:34:25,981 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 63 [2018-01-21 10:34:25,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:25,982 INFO L432 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2018-01-21 10:34:25,982 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 10:34:25,982 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2018-01-21 10:34:25,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-01-21 10:34:25,984 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:25,984 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:25,984 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:25,984 INFO L82 PathProgramCache]: Analyzing trace with hash 86499937, now seen corresponding path program 3 times [2018-01-21 10:34:25,984 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:25,985 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:25,985 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:25,985 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:25,986 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:26,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:26,009 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:26,109 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-21 10:34:26,110 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:26,110 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:26,110 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:26,110 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:26,110 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:26,111 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:26,118 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:26,118 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:26,133 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:26,140 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:26,144 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:26,149 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:26,151 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:26,154 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:26,277 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 10:34:26,278 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:26,437 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 10:34:26,458 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:26,459 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:26,463 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:26,463 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:26,484 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:26,502 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:26,526 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:26,556 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:26,568 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:26,574 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:26,586 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 10:34:26,586 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:26,665 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 10:34:26,667 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:26,667 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-21 10:34:26,667 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:26,667 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 10:34:26,667 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 10:34:26,668 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:34:26,668 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand 11 states. [2018-01-21 10:34:26,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:26,887 INFO L93 Difference]: Finished difference Result 215 states and 249 transitions. [2018-01-21 10:34:26,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 10:34:26,887 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 89 [2018-01-21 10:34:26,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:26,888 INFO L225 Difference]: With dead ends: 215 [2018-01-21 10:34:26,889 INFO L226 Difference]: Without dead ends: 186 [2018-01-21 10:34:26,889 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 344 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-21 10:34:26,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-01-21 10:34:26,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 127. [2018-01-21 10:34:26,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-01-21 10:34:26,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 147 transitions. [2018-01-21 10:34:26,901 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 147 transitions. Word has length 89 [2018-01-21 10:34:26,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:26,902 INFO L432 AbstractCegarLoop]: Abstraction has 127 states and 147 transitions. [2018-01-21 10:34:26,902 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 10:34:26,902 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 147 transitions. [2018-01-21 10:34:26,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-01-21 10:34:26,905 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:26,905 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:26,905 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:26,905 INFO L82 PathProgramCache]: Analyzing trace with hash 1835683312, now seen corresponding path program 4 times [2018-01-21 10:34:26,905 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:26,906 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:26,906 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:26,907 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:26,907 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:26,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:26,935 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:27,072 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-21 10:34:27,072 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:27,073 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:27,073 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:27,073 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:27,073 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:27,073 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:27,081 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:34:27,081 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:34:27,118 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:27,122 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:27,287 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 10:34:27,287 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:27,504 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 10:34:27,525 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:27,525 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:27,528 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:34:27,528 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:34:27,576 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:27,582 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:27,600 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 10:34:27,600 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:27,763 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 10:34:27,764 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:27,764 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-21 10:34:27,764 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:27,765 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 10:34:27,765 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 10:34:27,765 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:34:27,765 INFO L87 Difference]: Start difference. First operand 127 states and 147 transitions. Second operand 18 states. [2018-01-21 10:34:28,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:28,090 INFO L93 Difference]: Finished difference Result 335 states and 391 transitions. [2018-01-21 10:34:28,090 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 10:34:28,090 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 120 [2018-01-21 10:34:28,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:28,093 INFO L225 Difference]: With dead ends: 335 [2018-01-21 10:34:28,093 INFO L226 Difference]: Without dead ends: 258 [2018-01-21 10:34:28,094 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 452 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-21 10:34:28,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-01-21 10:34:28,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 162. [2018-01-21 10:34:28,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-01-21 10:34:28,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 187 transitions. [2018-01-21 10:34:28,113 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 187 transitions. Word has length 120 [2018-01-21 10:34:28,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:28,114 INFO L432 AbstractCegarLoop]: Abstraction has 162 states and 187 transitions. [2018-01-21 10:34:28,114 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 10:34:28,114 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 187 transitions. [2018-01-21 10:34:28,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-01-21 10:34:28,116 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:28,116 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:28,116 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:28,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1639693249, now seen corresponding path program 5 times [2018-01-21 10:34:28,117 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:28,118 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,118 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:28,118 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:28,118 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:28,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:28,146 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:28,271 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-21 10:34:28,271 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:28,271 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:28,271 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:28,271 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:28,271 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:28,271 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:28,277 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:34:28,277 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:28,288 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,292 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,296 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,300 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,305 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,310 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,312 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:28,315 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:28,423 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 10:34:28,423 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:28,652 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 10:34:28,673 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:28,673 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:28,677 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:34:28,677 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:28,688 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,693 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,705 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,718 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,740 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,770 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:28,787 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:28,792 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:28,818 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 10:34:28,818 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:29,087 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 10:34:29,089 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:29,089 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-21 10:34:29,089 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:29,089 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 10:34:29,090 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 10:34:29,090 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:34:29,090 INFO L87 Difference]: Start difference. First operand 162 states and 187 transitions. Second operand 18 states. [2018-01-21 10:34:29,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:29,482 INFO L93 Difference]: Finished difference Result 376 states and 433 transitions. [2018-01-21 10:34:29,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 10:34:29,483 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 151 [2018-01-21 10:34:29,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:29,485 INFO L225 Difference]: With dead ends: 376 [2018-01-21 10:34:29,485 INFO L226 Difference]: Without dead ends: 225 [2018-01-21 10:34:29,486 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 583 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 10:34:29,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-01-21 10:34:29,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 166. [2018-01-21 10:34:29,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-01-21 10:34:29,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 187 transitions. [2018-01-21 10:34:29,501 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 187 transitions. Word has length 151 [2018-01-21 10:34:29,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:29,502 INFO L432 AbstractCegarLoop]: Abstraction has 166 states and 187 transitions. [2018-01-21 10:34:29,502 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 10:34:29,502 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 187 transitions. [2018-01-21 10:34:29,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-01-21 10:34:29,504 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:29,504 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:29,504 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:29,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1261295644, now seen corresponding path program 6 times [2018-01-21 10:34:29,504 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:29,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:29,505 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:29,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:29,506 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:29,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:29,533 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:29,675 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:34:29,675 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:29,675 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:29,675 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:29,675 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:29,675 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:29,675 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:29,680 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:34:29,681 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:34:29,694 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,696 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,699 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,703 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,707 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,712 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,717 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,722 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,728 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,730 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:29,733 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:29,763 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:34:29,764 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:29,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:34:29,883 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:29,883 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:29,886 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:34:29,887 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:34:29,904 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,912 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,929 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,955 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:29,990 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:30,040 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:30,113 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:30,257 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:30,435 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:30,473 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:30,482 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:30,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:34:30,503 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:30,573 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:34:30,576 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:30,576 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 10:34:30,576 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:30,577 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 10:34:30,577 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 10:34:30,577 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 10:34:30,577 INFO L87 Difference]: Start difference. First operand 166 states and 187 transitions. Second operand 11 states. [2018-01-21 10:34:30,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:30,737 INFO L93 Difference]: Finished difference Result 261 states and 295 transitions. [2018-01-21 10:34:30,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 10:34:30,737 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 187 [2018-01-21 10:34:30,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:30,739 INFO L225 Difference]: With dead ends: 261 [2018-01-21 10:34:30,740 INFO L226 Difference]: Without dead ends: 220 [2018-01-21 10:34:30,740 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 739 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 10:34:30,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-21 10:34:30,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 175. [2018-01-21 10:34:30,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-01-21 10:34:30,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 198 transitions. [2018-01-21 10:34:30,758 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 198 transitions. Word has length 187 [2018-01-21 10:34:30,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:30,758 INFO L432 AbstractCegarLoop]: Abstraction has 175 states and 198 transitions. [2018-01-21 10:34:30,758 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 10:34:30,758 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 198 transitions. [2018-01-21 10:34:30,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-01-21 10:34:30,761 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:30,762 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:30,762 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:30,762 INFO L82 PathProgramCache]: Analyzing trace with hash 2078734259, now seen corresponding path program 7 times [2018-01-21 10:34:30,762 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:30,763 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:30,763 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:30,763 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:30,763 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:30,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:30,795 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:30,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-21 10:34:30,978 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:30,978 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:30,978 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:30,978 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:30,978 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:30,979 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:30,984 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:30,984 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:31,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:31,053 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:31,203 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 10:34:31,203 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:31,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 10:34:31,455 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:31,455 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:31,458 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:31,458 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:34:31,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:31,562 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:31,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 10:34:31,592 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:31,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 10:34:31,768 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:31,768 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-21 10:34:31,768 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:31,769 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 10:34:31,769 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 10:34:31,769 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-21 10:34:31,770 INFO L87 Difference]: Start difference. First operand 175 states and 198 transitions. Second operand 23 states. [2018-01-21 10:34:32,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:32,151 INFO L93 Difference]: Finished difference Result 454 states and 513 transitions. [2018-01-21 10:34:32,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 10:34:32,151 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 218 [2018-01-21 10:34:32,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:32,154 INFO L225 Difference]: With dead ends: 454 [2018-01-21 10:34:32,154 INFO L226 Difference]: Without dead ends: 360 [2018-01-21 10:34:32,156 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 894 GetRequests, 839 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 10:34:32,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-01-21 10:34:32,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 215. [2018-01-21 10:34:32,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-01-21 10:34:32,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 244 transitions. [2018-01-21 10:34:32,176 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 244 transitions. Word has length 218 [2018-01-21 10:34:32,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:32,176 INFO L432 AbstractCegarLoop]: Abstraction has 215 states and 244 transitions. [2018-01-21 10:34:32,177 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 10:34:32,177 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 244 transitions. [2018-01-21 10:34:32,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2018-01-21 10:34:32,181 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:32,181 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:32,181 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:32,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1659522376, now seen corresponding path program 8 times [2018-01-21 10:34:32,181 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:32,182 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:32,182 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:34:32,182 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:32,183 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:32,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:32,220 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:32,464 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-21 10:34:32,464 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:32,464 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:32,465 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:32,465 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:32,465 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:32,465 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:32,470 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:32,470 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:32,488 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:32,518 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:32,523 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:32,528 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:32,682 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 10:34:32,682 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:32,956 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 10:34:32,977 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:32,977 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:32,980 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:34:32,980 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:33,009 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:33,065 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:33,110 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:33,122 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:33,185 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 10:34:33,185 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:33,478 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 10:34:33,480 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:33,480 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-21 10:34:33,480 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:33,481 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 10:34:33,481 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 10:34:33,481 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-21 10:34:33,481 INFO L87 Difference]: Start difference. First operand 215 states and 244 transitions. Second operand 26 states. [2018-01-21 10:34:34,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:34,133 INFO L93 Difference]: Finished difference Result 559 states and 631 transitions. [2018-01-21 10:34:34,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 10:34:34,134 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 269 [2018-01-21 10:34:34,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:34,137 INFO L225 Difference]: With dead ends: 559 [2018-01-21 10:34:34,137 INFO L226 Difference]: Without dead ends: 453 [2018-01-21 10:34:34,138 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1101 GetRequests, 1038 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 10:34:34,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2018-01-21 10:34:34,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 260. [2018-01-21 10:34:34,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2018-01-21 10:34:34,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 296 transitions. [2018-01-21 10:34:34,156 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 296 transitions. Word has length 269 [2018-01-21 10:34:34,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:34,157 INFO L432 AbstractCegarLoop]: Abstraction has 260 states and 296 transitions. [2018-01-21 10:34:34,157 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 10:34:34,157 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 296 transitions. [2018-01-21 10:34:34,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-01-21 10:34:34,161 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:34,162 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:34,162 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:34,162 INFO L82 PathProgramCache]: Analyzing trace with hash 469392129, now seen corresponding path program 9 times [2018-01-21 10:34:34,162 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:34,163 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:34,163 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:34,163 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:34,163 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:34,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:34,197 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:34,634 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-21 10:34:34,634 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:34,635 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:34,635 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:34,635 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:34,635 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:34,635 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:34,641 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:34,641 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:34,664 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:34,673 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:34,677 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:34,681 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:34,687 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:34,692 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:34,698 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:34,706 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:34,708 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:34,714 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:34,886 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 10:34:34,886 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:35,225 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 10:34:35,245 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:35,245 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:35,249 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:35,249 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:35,275 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:35,284 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:35,324 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:35,356 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:35,424 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:35,599 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:35,943 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:36,494 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:36,535 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:36,543 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:36,589 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 10:34:36,589 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:36,786 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 10:34:36,788 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:36,788 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-21 10:34:36,788 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:36,788 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 10:34:36,789 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 10:34:36,789 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-21 10:34:36,789 INFO L87 Difference]: Start difference. First operand 260 states and 296 transitions. Second operand 21 states. [2018-01-21 10:34:37,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:37,221 INFO L93 Difference]: Finished difference Result 639 states and 732 transitions. [2018-01-21 10:34:37,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 10:34:37,221 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 325 [2018-01-21 10:34:37,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:37,226 INFO L225 Difference]: With dead ends: 639 [2018-01-21 10:34:37,226 INFO L226 Difference]: Without dead ends: 586 [2018-01-21 10:34:37,228 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1318 GetRequests, 1280 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:34:37,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2018-01-21 10:34:37,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 318. [2018-01-21 10:34:37,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2018-01-21 10:34:37,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 367 transitions. [2018-01-21 10:34:37,255 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 367 transitions. Word has length 325 [2018-01-21 10:34:37,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:37,256 INFO L432 AbstractCegarLoop]: Abstraction has 318 states and 367 transitions. [2018-01-21 10:34:37,256 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 10:34:37,256 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 367 transitions. [2018-01-21 10:34:37,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-01-21 10:34:37,259 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:37,260 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:37,260 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:37,260 INFO L82 PathProgramCache]: Analyzing trace with hash -1594188886, now seen corresponding path program 10 times [2018-01-21 10:34:37,260 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:37,261 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:37,261 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:37,261 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:37,261 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:37,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:37,308 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:37,693 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-21 10:34:37,693 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:37,693 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:37,693 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:37,693 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:37,694 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:37,694 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:37,699 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:34:37,700 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:34:37,793 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:37,801 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:38,109 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 10:34:38,110 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:38,537 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 10:34:38,558 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:38,558 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:38,561 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:34:38,561 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:34:38,733 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:38,746 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:38,836 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 10:34:38,837 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:39,238 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 10:34:39,240 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:39,241 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-21 10:34:39,241 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:39,242 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 10:34:39,242 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 10:34:39,243 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 10:34:39,243 INFO L87 Difference]: Start difference. First operand 318 states and 367 transitions. Second operand 32 states. [2018-01-21 10:34:40,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:40,264 INFO L93 Difference]: Finished difference Result 837 states and 962 transitions. [2018-01-21 10:34:40,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 10:34:40,264 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 386 [2018-01-21 10:34:40,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:40,269 INFO L225 Difference]: With dead ends: 837 [2018-01-21 10:34:40,269 INFO L226 Difference]: Without dead ends: 697 [2018-01-21 10:34:40,272 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1575 GetRequests, 1496 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 10:34:40,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2018-01-21 10:34:40,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 373. [2018-01-21 10:34:40,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373 states. [2018-01-21 10:34:40,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 428 transitions. [2018-01-21 10:34:40,353 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 428 transitions. Word has length 386 [2018-01-21 10:34:40,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:40,354 INFO L432 AbstractCegarLoop]: Abstraction has 373 states and 428 transitions. [2018-01-21 10:34:40,354 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 10:34:40,354 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 428 transitions. [2018-01-21 10:34:40,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2018-01-21 10:34:40,358 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:40,358 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:40,358 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:40,359 INFO L82 PathProgramCache]: Analyzing trace with hash -655925471, now seen corresponding path program 11 times [2018-01-21 10:34:40,359 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:40,359 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:40,359 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:40,360 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:40,360 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:40,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:40,411 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:40,841 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-21 10:34:40,841 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:40,841 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:40,842 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:40,842 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:40,842 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:40,842 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:40,848 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:34:40,848 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:40,878 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:40,888 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:40,898 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:40,909 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:40,923 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:40,936 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:40,952 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:40,967 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:40,970 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:40,979 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:41,309 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 10:34:41,309 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:41,892 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 10:34:41,913 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:41,913 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:41,916 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:34:41,917 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:34:41,952 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:41,967 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,000 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,054 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,148 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,324 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,554 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,863 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:34:42,917 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:42,927 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:43,004 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 10:34:43,004 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:43,450 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 10:34:43,453 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:34:43,453 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19, 19, 19, 19] total 40 [2018-01-21 10:34:43,454 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:34:43,454 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 10:34:43,454 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 10:34:43,455 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1305, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 10:34:43,455 INFO L87 Difference]: Start difference. First operand 373 states and 428 transitions. Second operand 32 states. [2018-01-21 10:34:44,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:34:44,721 INFO L93 Difference]: Finished difference Result 727 states and 820 transitions. [2018-01-21 10:34:44,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 10:34:44,722 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 447 [2018-01-21 10:34:44,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:34:44,725 INFO L225 Difference]: With dead ends: 727 [2018-01-21 10:34:44,726 INFO L226 Difference]: Without dead ends: 575 [2018-01-21 10:34:44,728 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1842 GetRequests, 1753 SyntacticMatches, 22 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1373 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=773, Invalid=3919, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 10:34:44,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2018-01-21 10:34:44,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 374. [2018-01-21 10:34:44,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2018-01-21 10:34:44,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 429 transitions. [2018-01-21 10:34:44,758 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 429 transitions. Word has length 447 [2018-01-21 10:34:44,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:34:44,759 INFO L432 AbstractCegarLoop]: Abstraction has 374 states and 429 transitions. [2018-01-21 10:34:44,759 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 10:34:44,759 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 429 transitions. [2018-01-21 10:34:44,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2018-01-21 10:34:44,764 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:34:44,764 INFO L322 BasicCegarLoop]: trace histogram [81, 68, 68, 68, 68, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:34:44,764 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:34:44,764 INFO L82 PathProgramCache]: Analyzing trace with hash 832198916, now seen corresponding path program 12 times [2018-01-21 10:34:44,765 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:34:44,765 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:44,765 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:34:44,766 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:34:44,766 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:34:44,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:34:44,823 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:34:45,321 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 0 proven. 416 refuted. 0 times theorem prover too weak. 13626 trivial. 0 not checked. [2018-01-21 10:34:45,329 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:45,329 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:34:45,329 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:34:45,329 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:34:45,329 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:45,329 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:34:45,334 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:34:45,335 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:34:45,363 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,373 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,377 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,384 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,389 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,397 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,404 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,413 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,423 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,433 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,444 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,456 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,472 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,485 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,500 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,523 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:45,527 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:34:45,537 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:34:45,793 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 10:34:45,793 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:34:46,524 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 10:34:46,547 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:46,547 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 28 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:46,550 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:34:46,550 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:34:46,591 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:46,605 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:46,643 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:46,697 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:46,855 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:47,279 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:50,526 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:34:53,939 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:05,985 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown