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_mostprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 03:22:05,751 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 03:22:05,752 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 03:22:05,769 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 03:22:05,769 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 03:22:05,770 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 03:22:05,771 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 03:22:05,773 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 03:22:05,775 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 03:22:05,776 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 03:22:05,777 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 03:22:05,777 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 03:22:05,778 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 03:22:05,779 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 03:22:05,780 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 03:22:05,782 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 03:22:05,784 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 03:22:05,786 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 03:22:05,788 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 03:22:05,789 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 03:22:05,792 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 03:22:05,798 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_mostprecise.epf [2018-01-21 03:22:05,813 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 03:22:05,813 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 03:22:05,814 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 03:22:05,814 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 03:22:05,814 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 03:22:05,815 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 03:22:05,815 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 03:22:05,815 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 03:22:05,815 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 03:22:05,816 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 03:22:05,816 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 03:22:05,816 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 03:22:05,816 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 03:22:05,817 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 03:22:05,817 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 03:22:05,818 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 03:22:05,818 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 03:22:05,818 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 03:22:05,818 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 03:22:05,818 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 03:22:05,819 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 03:22:05,819 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 03:22:05,819 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 03:22:05,819 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 03:22:05,819 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 03:22:05,820 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 03:22:05,820 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 03:22:05,820 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:22:05,820 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 03:22:05,820 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 03:22:05,821 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 03:22:05,821 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 03:22:05,821 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 03:22:05,821 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 03:22:05,821 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 03:22:05,822 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 03:22:05,822 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 03:22:05,824 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 03:22:05,825 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 03:22:05,825 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 03:22:05,895 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 03:22:05,917 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 03:22:05,922 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 03:22:05,923 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 03:22:05,924 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 03:22:05,924 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-21 03:22:06,052 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 03:22:06,058 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 03:22:06,059 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 03:22:06,059 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 03:22:06,065 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 03:22:06,066 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:22:06" (1/1) ... [2018-01-21 03:22:06,069 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 03:22:06, skipping insertion in model container [2018-01-21 03:22:06,069 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:22:06" (1/1) ... [2018-01-21 03:22:06,087 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:22:06,103 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:22:06,244 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:22:06,262 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:22:06,269 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06 WrapperNode [2018-01-21 03:22:06,269 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 03:22:06,270 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 03:22:06,270 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 03:22:06,270 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 03:22:06,286 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06" (1/1) ... [2018-01-21 03:22:06,286 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06" (1/1) ... [2018-01-21 03:22:06,296 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06" (1/1) ... [2018-01-21 03:22:06,297 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06" (1/1) ... [2018-01-21 03:22:06,302 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06" (1/1) ... [2018-01-21 03:22:06,305 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06" (1/1) ... [2018-01-21 03:22:06,307 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06" (1/1) ... [2018-01-21 03:22:06,308 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 03:22:06,309 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 03:22:06,309 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 03:22:06,309 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 03:22:06,310 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06" (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 03:22:06,375 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 03:22:06,375 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 03:22:06,375 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 03:22:06,375 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 03:22:06,376 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 03:22:06,376 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 03:22:06,376 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 03:22:06,376 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 03:22:06,376 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 03:22:06,376 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 03:22:06,377 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 03:22:06,377 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 03:22:06,377 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 03:22:06,655 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 03:22:06,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:22:06 BoogieIcfgContainer [2018-01-21 03:22:06,656 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 03:22:06,657 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 03:22:06,657 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 03:22:06,658 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 03:22:06,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 03:22:06" (1/3) ... [2018-01-21 03:22:06,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c5711b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:22:06, skipping insertion in model container [2018-01-21 03:22:06,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:06" (2/3) ... [2018-01-21 03:22:06,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c5711b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:22:06, skipping insertion in model container [2018-01-21 03:22:06,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:22:06" (3/3) ... [2018-01-21 03:22:06,662 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-21 03:22:06,672 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 03:22:06,679 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 03:22:06,733 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:22:06,733 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:22:06,734 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:22:06,734 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:22:06,734 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:22:06,734 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:22:06,734 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:22:06,734 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 03:22:06,735 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:22:06,757 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 03:22:06,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 03:22:06,769 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:06,770 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 03:22:06,770 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 03:22:06,779 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 03:22:06,782 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:06,841 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,842 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:06,842 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,842 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:06,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:22:06,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:22:06,913 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:22:06,921 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:22:06,929 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:22:06,929 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:22:06,929 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:22:06,929 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:22:06,930 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:22:06,930 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:22:06,930 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:22:06,931 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 03:22:06,931 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:22:06,933 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 03:22:06,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 03:22:06,934 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:06,934 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:06,935 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 03:22:06,935 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 03:22:06,935 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:06,936 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,937 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:06,937 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,937 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:06,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:06,967 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:07,013 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 03:22:07,015 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:22:07,015 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:22:07,015 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:22:07,017 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:22:07,032 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:22:07,032 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:22:07,035 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 03:22:07,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:07,074 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 03:22:07,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:22:07,076 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 03:22:07,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:07,090 INFO L225 Difference]: With dead ends: 72 [2018-01-21 03:22:07,090 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 03:22:07,094 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 03:22:07,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 03:22:07,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 03:22:07,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 03:22:07,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 03:22:07,198 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 03:22:07,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:07,198 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 03:22:07,198 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:22:07,198 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 03:22:07,198 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 03:22:07,200 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:22:07,201 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:22:07,201 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:22:07,201 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:22:07,201 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:22:07,201 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:22:07,201 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:22:07,201 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 03:22:07,201 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:22:07,203 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 03:22:07,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 03:22:07,204 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:07,204 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 03:22:07,205 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:07,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 03:22:07,205 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:07,207 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:07,207 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:07,207 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:07,207 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:07,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:07,216 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:07,231 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 03:22:07,233 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:22:07,233 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:22:07,233 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:22:07,234 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:22:07,234 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:22:07,234 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:22:07,234 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 03:22:07,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:07,239 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 03:22:07,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:22:07,240 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 03:22:07,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:07,242 INFO L225 Difference]: With dead ends: 72 [2018-01-21 03:22:07,242 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 03:22:07,243 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 03:22:07,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 03:22:07,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 03:22:07,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 03:22:07,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 03:22:07,254 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 03:22:07,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:07,254 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 03:22:07,254 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:22:07,254 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 03:22:07,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 03:22:07,255 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:07,255 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 03:22:07,255 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:07,255 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 03:22:07,256 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:07,256 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:07,257 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:07,257 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:07,257 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:07,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:07,269 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:07,318 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 03:22:07,319 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:22:07,319 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 03:22:07,319 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:22:07,321 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 03:22:07,321 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 03:22:07,322 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 03:22:07,322 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 03:22:07,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:07,410 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 03:22:07,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 03:22:07,410 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 03:22:07,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:07,415 INFO L225 Difference]: With dead ends: 66 [2018-01-21 03:22:07,415 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 03:22:07,416 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 03:22:07,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 03:22:07,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 03:22:07,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 03:22:07,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 03:22:07,434 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 03:22:07,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:07,435 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 03:22:07,435 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 03:22:07,435 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 03:22:07,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 03:22:07,436 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:07,436 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:07,436 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:07,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 03:22:07,437 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:07,438 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:07,438 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:07,438 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:07,438 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:07,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:07,464 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:07,721 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:07,722 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:22:07,722 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 03:22:07,722 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:22:07,723 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 03:22:07,723 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 03:22:07,723 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-01-21 03:22:07,724 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 03:22:07,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:07,941 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 03:22:07,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 03:22:07,941 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 03:22:07,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:07,942 INFO L225 Difference]: With dead ends: 80 [2018-01-21 03:22:07,943 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 03:22:07,943 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-01-21 03:22:07,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 03:22:07,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 03:22:07,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 03:22:07,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 03:22:07,950 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 03:22:07,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:07,950 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 03:22:07,950 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 03:22:07,951 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 03:22:07,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 03:22:07,952 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:07,952 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:07,952 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:07,953 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 03:22:07,953 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:07,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:07,954 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:07,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:07,955 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:07,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:07,974 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:08,114 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:08,115 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:08,115 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:08,122 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 03:22:08,124 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 03:22:08,199 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:22:08,200 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 03:22:12,348 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 03:22:12,349 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-21 03:22:12,397 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 03:22:12,398 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:12,398 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 03:22:12,414 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:12,415 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:12,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:12,466 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:12,835 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:12,836 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:13,122 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:13,148 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:13,149 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 03:22:13,155 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:13,156 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:13,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:13,203 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:13,243 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 03:22:13,243 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:13,386 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 03:22:13,389 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:13,390 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 4, 4] total 15 [2018-01-21 03:22:13,390 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:13,390 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 03:22:13,391 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 03:22:13,391 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2018-01-21 03:22:13,391 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-21 03:22:13,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:13,661 INFO L93 Difference]: Finished difference Result 87 states and 94 transitions. [2018-01-21 03:22:13,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 03:22:13,662 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 03:22:13,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:13,664 INFO L225 Difference]: With dead ends: 87 [2018-01-21 03:22:13,664 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 03:22:13,665 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-01-21 03:22:13,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 03:22:13,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2018-01-21 03:22:13,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 03:22:13,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-01-21 03:22:13,671 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 36 [2018-01-21 03:22:13,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:13,671 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-01-21 03:22:13,671 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 03:22:13,671 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-01-21 03:22:13,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 03:22:13,673 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:13,673 INFO L322 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1] [2018-01-21 03:22:13,673 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:13,673 INFO L82 PathProgramCache]: Analyzing trace with hash -524554428, now seen corresponding path program 2 times [2018-01-21 03:22:13,674 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:13,675 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:13,675 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:13,675 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:13,675 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:13,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:13,695 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:13,889 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:13,890 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:13,890 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:13,890 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:13,890 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:13,890 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:13,890 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 03:22:13,896 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:13,897 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:13,907 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:13,912 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:13,914 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:13,916 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:13,996 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:13,997 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:14,114 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:14,136 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:14,136 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:14,143 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:14,143 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:14,154 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:14,165 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:14,172 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:14,176 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:14,199 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 03:22:14,200 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:14,237 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 03:22:14,238 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:14,238 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 4, 4] total 18 [2018-01-21 03:22:14,238 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:14,239 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 03:22:14,239 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 03:22:14,239 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2018-01-21 03:22:14,239 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 10 states. [2018-01-21 03:22:14,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:14,387 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2018-01-21 03:22:14,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 03:22:14,388 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 41 [2018-01-21 03:22:14,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:14,389 INFO L225 Difference]: With dead ends: 97 [2018-01-21 03:22:14,389 INFO L226 Difference]: Without dead ends: 56 [2018-01-21 03:22:14,390 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2018-01-21 03:22:14,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-01-21 03:22:14,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2018-01-21 03:22:14,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-21 03:22:14,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-01-21 03:22:14,396 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 41 [2018-01-21 03:22:14,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:14,397 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-01-21 03:22:14,397 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 03:22:14,397 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-01-21 03:22:14,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 03:22:14,401 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:14,401 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 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] [2018-01-21 03:22:14,401 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:14,401 INFO L82 PathProgramCache]: Analyzing trace with hash -438141712, now seen corresponding path program 3 times [2018-01-21 03:22:14,401 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:14,402 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:14,403 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:14,403 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:14,403 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:14,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:14,422 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:14,613 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:14,613 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:14,613 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:14,613 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:14,613 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:14,613 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:14,613 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:14,628 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:14,628 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:14,638 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:14,643 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:14,647 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:14,650 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:14,709 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 03:22:14,710 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:14,793 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 03:22:14,822 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:14,822 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:14,828 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:14,828 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:14,851 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:14,863 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:14,872 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:14,877 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:14,889 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 03:22:14,889 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:15,009 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 03:22:15,011 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:15,011 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 4, 4] total 11 [2018-01-21 03:22:15,011 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:15,011 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 03:22:15,012 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 03:22:15,012 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-01-21 03:22:15,012 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 9 states. [2018-01-21 03:22:15,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:15,190 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2018-01-21 03:22:15,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 03:22:15,191 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2018-01-21 03:22:15,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:15,192 INFO L225 Difference]: With dead ends: 131 [2018-01-21 03:22:15,192 INFO L226 Difference]: Without dead ends: 85 [2018-01-21 03:22:15,193 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-01-21 03:22:15,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-01-21 03:22:15,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2018-01-21 03:22:15,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-01-21 03:22:15,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 72 transitions. [2018-01-21 03:22:15,199 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 72 transitions. Word has length 46 [2018-01-21 03:22:15,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:15,199 INFO L432 AbstractCegarLoop]: Abstraction has 67 states and 72 transitions. [2018-01-21 03:22:15,199 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 03:22:15,199 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 72 transitions. [2018-01-21 03:22:15,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-01-21 03:22:15,201 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:15,202 INFO L322 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 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] [2018-01-21 03:22:15,202 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:15,202 INFO L82 PathProgramCache]: Analyzing trace with hash 515188947, now seen corresponding path program 4 times [2018-01-21 03:22:15,202 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:15,203 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:15,203 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:15,203 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:15,203 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:15,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:15,226 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:15,397 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 03:22:15,397 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:15,397 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:15,397 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:15,397 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:15,397 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:15,397 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:15,404 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:22:15,404 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:22:15,429 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:15,432 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:15,513 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-21 03:22:15,514 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:15,713 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 03:22:15,734 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:15,735 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:15,738 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:22:15,738 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:22:15,812 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:15,819 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:15,835 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-21 03:22:15,835 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:15,902 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 03:22:15,904 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:15,904 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-21 03:22:15,904 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:15,907 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 03:22:15,908 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 03:22:15,908 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2018-01-21 03:22:15,908 INFO L87 Difference]: Start difference. First operand 67 states and 72 transitions. Second operand 14 states. [2018-01-21 03:22:16,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:16,142 INFO L93 Difference]: Finished difference Result 134 states and 145 transitions. [2018-01-21 03:22:16,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 03:22:16,143 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 82 [2018-01-21 03:22:16,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:16,144 INFO L225 Difference]: With dead ends: 134 [2018-01-21 03:22:16,144 INFO L226 Difference]: Without dead ends: 75 [2018-01-21 03:22:16,145 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 314 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=201, Invalid=449, Unknown=0, NotChecked=0, Total=650 [2018-01-21 03:22:16,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-21 03:22:16,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2018-01-21 03:22:16,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-01-21 03:22:16,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-01-21 03:22:16,153 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 82 [2018-01-21 03:22:16,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:16,153 INFO L432 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-01-21 03:22:16,153 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 03:22:16,153 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-01-21 03:22:16,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-01-21 03:22:16,155 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:16,155 INFO L322 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 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] [2018-01-21 03:22:16,155 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:16,155 INFO L82 PathProgramCache]: Analyzing trace with hash -611097235, now seen corresponding path program 5 times [2018-01-21 03:22:16,156 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:16,156 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:16,157 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:16,157 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:16,157 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:16,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:16,177 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:16,611 WARN L146 SmtUtils]: Spent 331ms on a formula simplification. DAG size of input: 12 DAG size of output 10 [2018-01-21 03:22:16,810 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 03:22:16,811 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:16,811 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:16,811 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:16,811 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:16,811 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:16,811 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:16,825 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:22:16,825 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:16,834 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:16,836 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:16,838 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:16,840 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:16,842 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:16,863 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:16,868 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:16,870 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:17,041 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-21 03:22:17,042 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:17,185 WARN L143 SmtUtils]: Spent 138ms on a formula simplification that was a NOOP. DAG size: 25 [2018-01-21 03:22:17,357 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 03:22:17,378 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:17,378 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:17,382 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:22:17,383 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:17,396 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:17,400 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:17,408 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:17,417 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:17,429 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:17,447 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:17,463 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:17,469 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:17,486 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-21 03:22:17,486 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:17,565 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 03:22:17,568 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:17,568 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-21 03:22:17,568 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:17,569 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 03:22:17,569 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 03:22:17,569 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-01-21 03:22:17,570 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 16 states. [2018-01-21 03:22:17,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:17,798 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2018-01-21 03:22:17,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 03:22:17,799 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 92 [2018-01-21 03:22:17,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:17,801 INFO L225 Difference]: With dead ends: 144 [2018-01-21 03:22:17,801 INFO L226 Difference]: Without dead ends: 80 [2018-01-21 03:22:17,802 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 352 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=268, Invalid=602, Unknown=0, NotChecked=0, Total=870 [2018-01-21 03:22:17,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-21 03:22:17,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 77. [2018-01-21 03:22:17,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-21 03:22:17,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-01-21 03:22:17,810 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 92 [2018-01-21 03:22:17,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:17,811 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-01-21 03:22:17,811 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 03:22:17,811 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-01-21 03:22:17,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-01-21 03:22:17,813 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:17,813 INFO L322 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 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] [2018-01-21 03:22:17,813 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:17,814 INFO L82 PathProgramCache]: Analyzing trace with hash -556985837, now seen corresponding path program 6 times [2018-01-21 03:22:17,814 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:17,815 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:17,815 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:17,815 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:17,815 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:17,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:17,838 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:18,148 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 5 proven. 296 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-01-21 03:22:18,148 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:18,148 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:18,148 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:18,149 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:18,149 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:18,149 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:18,154 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:22:18,154 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:22:18,166 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,168 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,171 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,181 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,185 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,187 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:18,190 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:18,219 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 03:22:18,219 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:18,291 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 03:22:18,313 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:18,313 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:18,317 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:22:18,317 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:22:18,332 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,338 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,350 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,371 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,392 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:18,403 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:18,407 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:18,422 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 03:22:18,422 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:18,503 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 03:22:18,505 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:18,505 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5, 5, 5] total 16 [2018-01-21 03:22:18,505 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:18,506 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 03:22:18,506 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 03:22:18,506 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2018-01-21 03:22:18,507 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-01-21 03:22:18,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:18,677 INFO L93 Difference]: Finished difference Result 183 states and 202 transitions. [2018-01-21 03:22:18,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 03:22:18,678 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 102 [2018-01-21 03:22:18,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:18,679 INFO L225 Difference]: With dead ends: 183 [2018-01-21 03:22:18,679 INFO L226 Difference]: Without dead ends: 114 [2018-01-21 03:22:18,680 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:22:18,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-01-21 03:22:18,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 91. [2018-01-21 03:22:18,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-01-21 03:22:18,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2018-01-21 03:22:18,690 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 102 [2018-01-21 03:22:18,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:18,691 INFO L432 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2018-01-21 03:22:18,691 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 03:22:18,691 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2018-01-21 03:22:18,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-01-21 03:22:18,694 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:18,694 INFO L322 BasicCegarLoop]: trace histogram [24, 21, 21, 21, 21, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:18,694 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:18,694 INFO L82 PathProgramCache]: Analyzing trace with hash 294495146, now seen corresponding path program 7 times [2018-01-21 03:22:18,694 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:18,695 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:18,695 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:18,695 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:18,696 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:18,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:18,718 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:19,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 03:22:19,028 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:19,028 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:19,028 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:19,029 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:19,029 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:19,029 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:19,040 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:19,041 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:19,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:19,085 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:19,289 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-21 03:22:19,290 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:19,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 03:22:19,556 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:19,556 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:19,559 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:19,559 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:19,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:19,630 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:19,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-21 03:22:19,651 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:19,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 03:22:19,747 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:19,747 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-21 03:22:19,748 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:19,748 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 03:22:19,748 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 03:22:19,749 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=582, Unknown=0, NotChecked=0, Total=812 [2018-01-21 03:22:19,749 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand 20 states. [2018-01-21 03:22:19,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:19,999 INFO L93 Difference]: Finished difference Result 182 states and 198 transitions. [2018-01-21 03:22:19,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 03:22:19,999 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 158 [2018-01-21 03:22:20,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:20,000 INFO L225 Difference]: With dead ends: 182 [2018-01-21 03:22:20,000 INFO L226 Difference]: Without dead ends: 99 [2018-01-21 03:22:20,001 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 650 GetRequests, 612 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=432, Invalid=974, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 03:22:20,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-01-21 03:22:20,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2018-01-21 03:22:20,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 03:22:20,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2018-01-21 03:22:20,014 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 158 [2018-01-21 03:22:20,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:20,014 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2018-01-21 03:22:20,014 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 03:22:20,014 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2018-01-21 03:22:20,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-01-21 03:22:20,016 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:20,016 INFO L322 BasicCegarLoop]: trace histogram [27, 24, 24, 24, 24, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:20,016 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:20,017 INFO L82 PathProgramCache]: Analyzing trace with hash 1051815268, now seen corresponding path program 8 times [2018-01-21 03:22:20,017 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:20,018 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:20,018 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:20,018 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:20,018 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:20,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:20,045 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:20,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 03:22:20,380 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:20,380 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:20,380 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:20,380 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:20,380 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:20,380 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:20,386 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:20,386 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:20,399 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:20,420 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:20,426 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:20,429 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:20,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-21 03:22:20,597 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:20,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 03:22:20,952 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:20,952 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:20,955 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:20,955 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:20,974 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:21,012 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:21,037 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:21,046 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:21,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-21 03:22:21,081 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:21,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 03:22:21,225 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:21,225 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-21 03:22:21,225 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:21,226 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 03:22:21,226 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 03:22:21,227 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=712, Unknown=0, NotChecked=0, Total=992 [2018-01-21 03:22:21,227 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 22 states. [2018-01-21 03:22:21,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:21,568 INFO L93 Difference]: Finished difference Result 192 states and 208 transitions. [2018-01-21 03:22:21,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 03:22:21,568 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 173 [2018-01-21 03:22:21,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:21,569 INFO L225 Difference]: With dead ends: 192 [2018-01-21 03:22:21,569 INFO L226 Difference]: Without dead ends: 104 [2018-01-21 03:22:21,570 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 670 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=529, Invalid=1193, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 03:22:21,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-01-21 03:22:21,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 101. [2018-01-21 03:22:21,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-21 03:22:21,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 108 transitions. [2018-01-21 03:22:21,581 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 108 transitions. Word has length 173 [2018-01-21 03:22:21,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:21,581 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 108 transitions. [2018-01-21 03:22:21,581 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 03:22:21,581 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 108 transitions. [2018-01-21 03:22:21,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-01-21 03:22:21,585 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:21,585 INFO L322 BasicCegarLoop]: trace histogram [30, 27, 27, 27, 27, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:21,585 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:21,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1142155370, now seen corresponding path program 9 times [2018-01-21 03:22:21,585 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:21,586 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:21,587 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:21,587 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:21,587 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:21,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:21,616 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:22,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 8 proven. 1090 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2018-01-21 03:22:22,099 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:22,099 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:22,099 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:22,099 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:22,099 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:22,099 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:22,111 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:22,111 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:22,132 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:22,137 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:22,143 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:22,152 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:22,165 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:22,169 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:22,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 03:22:22,217 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:22,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 03:22:22,340 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:22,341 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:22,344 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:22,344 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:22,364 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:22,373 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:22,388 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:22,411 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:22,423 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:22,428 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:22,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 03:22:22,455 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:22,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 03:22:22,501 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:22,501 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6, 6, 6] total 21 [2018-01-21 03:22:22,501 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:22,501 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 03:22:22,502 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 03:22:22,502 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-01-21 03:22:22,502 INFO L87 Difference]: Start difference. First operand 101 states and 108 transitions. Second operand 17 states. [2018-01-21 03:22:22,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:22,713 INFO L93 Difference]: Finished difference Result 236 states and 260 transitions. [2018-01-21 03:22:22,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 03:22:22,714 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 188 [2018-01-21 03:22:22,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:22,715 INFO L225 Difference]: With dead ends: 236 [2018-01-21 03:22:22,716 INFO L226 Difference]: Without dead ends: 143 [2018-01-21 03:22:22,716 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 744 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=338, Unknown=0, NotChecked=0, Total=462 [2018-01-21 03:22:22,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-21 03:22:22,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 115. [2018-01-21 03:22:22,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-21 03:22:22,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-01-21 03:22:22,726 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 188 [2018-01-21 03:22:22,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:22,727 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-01-21 03:22:22,727 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 03:22:22,727 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-01-21 03:22:22,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-01-21 03:22:22,731 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:22,731 INFO L322 BasicCegarLoop]: trace histogram [44, 40, 40, 40, 40, 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 03:22:22,731 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:22,731 INFO L82 PathProgramCache]: Analyzing trace with hash 132824627, now seen corresponding path program 10 times [2018-01-21 03:22:22,732 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:22,732 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:22,732 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:22,732 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:22,733 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:22,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:22,766 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:23,352 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 03:22:23,352 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:23,352 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:23,352 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:23,352 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:23,352 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:23,353 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:23,358 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:22:23,359 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:22:23,417 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:23,421 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:23,694 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-21 03:22:23,694 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:24,284 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 03:22:24,306 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:24,306 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:24,309 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:22:24,310 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:22:24,753 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:24,767 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:24,812 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-21 03:22:24,812 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:25,136 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 03:22:25,139 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:25,139 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-21 03:22:25,140 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:25,140 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 03:22:25,141 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 03:22:25,141 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 03:22:25,141 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 26 states. [2018-01-21 03:22:25,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:25,767 INFO L93 Difference]: Finished difference Result 230 states and 251 transitions. [2018-01-21 03:22:25,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 03:22:25,769 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 264 [2018-01-21 03:22:25,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:25,771 INFO L225 Difference]: With dead ends: 230 [2018-01-21 03:22:25,771 INFO L226 Difference]: Without dead ends: 123 [2018-01-21 03:22:25,773 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1080 GetRequests, 1030 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=753, Invalid=1697, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 03:22:25,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-21 03:22:25,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2018-01-21 03:22:25,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-01-21 03:22:25,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 129 transitions. [2018-01-21 03:22:25,782 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 129 transitions. Word has length 264 [2018-01-21 03:22:25,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:25,783 INFO L432 AbstractCegarLoop]: Abstraction has 120 states and 129 transitions. [2018-01-21 03:22:25,783 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 03:22:25,783 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 129 transitions. [2018-01-21 03:22:25,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-01-21 03:22:25,785 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:25,785 INFO L322 BasicCegarLoop]: trace histogram [48, 44, 44, 44, 44, 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 03:22:25,785 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:25,786 INFO L82 PathProgramCache]: Analyzing trace with hash -171303065, now seen corresponding path program 11 times [2018-01-21 03:22:25,786 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:25,787 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:25,787 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:25,787 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:25,787 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:25,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:25,820 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:26,512 WARN L146 SmtUtils]: Spent 220ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 03:22:26,690 WARN L146 SmtUtils]: Spent 109ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 03:22:26,872 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 03:22:26,872 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:26,872 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:26,872 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:26,872 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:26,872 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:26,873 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:26,881 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:22:26,881 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:26,903 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,906 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,910 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,915 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,920 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,929 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,936 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,943 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,952 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,961 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,971 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,982 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,995 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:26,997 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:27,004 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:27,310 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-21 03:22:27,311 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:28,004 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 03:22:28,039 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:28,039 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:28,043 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:22:28,044 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:28,072 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,077 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,089 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,109 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,141 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,191 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,260 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,348 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,437 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,588 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:28,775 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:29,036 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:29,405 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:29,456 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:29,467 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:29,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-21 03:22:29,540 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:29,751 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 03:22:29,753 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:29,753 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-21 03:22:29,753 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:29,754 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 03:22:29,754 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 03:22:29,755 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 03:22:29,755 INFO L87 Difference]: Start difference. First operand 120 states and 129 transitions. Second operand 28 states. [2018-01-21 03:22:30,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:30,317 INFO L93 Difference]: Finished difference Result 240 states and 261 transitions. [2018-01-21 03:22:30,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 03:22:30,317 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 284 [2018-01-21 03:22:30,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:30,319 INFO L225 Difference]: With dead ends: 240 [2018-01-21 03:22:30,319 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 03:22:30,320 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1162 GetRequests, 1108 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=880, Invalid=1982, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 03:22:30,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 03:22:30,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 125. [2018-01-21 03:22:30,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-01-21 03:22:30,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2018-01-21 03:22:30,326 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 284 [2018-01-21 03:22:30,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:30,327 INFO L432 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2018-01-21 03:22:30,327 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 03:22:30,327 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2018-01-21 03:22:30,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-01-21 03:22:30,329 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:30,329 INFO L322 BasicCegarLoop]: trace histogram [52, 48, 48, 48, 48, 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 03:22:30,330 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:30,330 INFO L82 PathProgramCache]: Analyzing trace with hash -2029948749, now seen corresponding path program 12 times [2018-01-21 03:22:30,330 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:30,331 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:30,331 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:30,331 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:30,331 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:30,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:30,369 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:30,987 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 11 proven. 2673 refuted. 0 times theorem prover too weak. 3414 trivial. 0 not checked. [2018-01-21 03:22:30,987 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:30,987 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:30,988 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:30,988 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:30,988 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:30,988 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:30,994 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:22:30,994 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:22:31,014 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,016 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,021 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,024 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,028 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,033 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,048 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,057 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,074 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,079 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:31,088 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:31,190 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 03:22:31,190 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:31,327 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 03:22:31,362 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:31,363 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:31,367 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:22:31,367 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:22:31,402 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,412 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,430 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,451 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,471 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,498 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,537 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,619 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,895 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:31,921 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:31,930 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:31,982 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 03:22:31,983 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:32,082 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 03:22:32,085 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:32,085 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7, 7, 7, 7] total 26 [2018-01-21 03:22:32,085 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:32,086 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 03:22:32,086 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 03:22:32,087 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2018-01-21 03:22:32,087 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand 21 states. [2018-01-21 03:22:32,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:32,309 INFO L93 Difference]: Finished difference Result 289 states and 318 transitions. [2018-01-21 03:22:32,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 03:22:32,310 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 304 [2018-01-21 03:22:32,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:32,312 INFO L225 Difference]: With dead ends: 289 [2018-01-21 03:22:32,312 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 03:22:32,313 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1231 GetRequests, 1206 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2018-01-21 03:22:32,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 03:22:32,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 139. [2018-01-21 03:22:32,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-01-21 03:22:32,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-01-21 03:22:32,323 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 304 [2018-01-21 03:22:32,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:32,323 INFO L432 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-01-21 03:22:32,323 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 03:22:32,323 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-01-21 03:22:32,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2018-01-21 03:22:32,326 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:32,326 INFO L322 BasicCegarLoop]: trace histogram [70, 65, 65, 65, 65, 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 03:22:32,326 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:32,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1350287972, now seen corresponding path program 13 times [2018-01-21 03:22:32,327 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:32,328 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:32,328 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:32,328 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:32,328 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:32,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:32,366 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:32,800 WARN L146 SmtUtils]: Spent 105ms on a formula simplification. DAG size of input: 12 DAG size of output 10 [2018-01-21 03:22:33,221 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 03:22:33,222 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:33,222 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:33,222 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:33,222 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:33,222 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:33,222 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:33,230 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:33,230 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:33,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:33,313 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:33,736 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-21 03:22:33,736 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:34,654 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 03:22:34,677 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:34,677 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:34,683 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:34,683 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:34,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:34,877 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:34,976 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-21 03:22:34,976 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:35,234 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 03:22:35,235 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:35,236 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-21 03:22:35,236 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:35,236 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 03:22:35,236 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 03:22:35,237 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=1557, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 03:22:35,237 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 32 states. [2018-01-21 03:22:35,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:35,848 INFO L93 Difference]: Finished difference Result 278 states and 304 transitions. [2018-01-21 03:22:35,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 03:22:35,852 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 400 [2018-01-21 03:22:35,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:35,854 INFO L225 Difference]: With dead ends: 278 [2018-01-21 03:22:35,854 INFO L226 Difference]: Without dead ends: 147 [2018-01-21 03:22:35,856 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1630 GetRequests, 1568 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1164, Invalid=2618, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 03:22:35,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-01-21 03:22:35,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2018-01-21 03:22:35,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-01-21 03:22:35,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 155 transitions. [2018-01-21 03:22:35,865 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 155 transitions. Word has length 400 [2018-01-21 03:22:35,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:35,865 INFO L432 AbstractCegarLoop]: Abstraction has 144 states and 155 transitions. [2018-01-21 03:22:35,865 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 03:22:35,865 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 155 transitions. [2018-01-21 03:22:35,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-21 03:22:35,868 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:35,869 INFO L322 BasicCegarLoop]: trace histogram [75, 70, 70, 70, 70, 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 03:22:35,869 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:35,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1570210812, now seen corresponding path program 14 times [2018-01-21 03:22:35,869 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:35,870 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:35,870 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:35,870 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:35,870 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:35,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:35,907 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:36,728 WARN L146 SmtUtils]: Spent 113ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 03:22:37,175 WARN L146 SmtUtils]: Spent 362ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 03:22:37,467 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 03:22:37,467 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:37,467 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:37,467 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:37,468 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:37,468 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:37,468 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:37,477 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:37,477 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:37,508 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:37,566 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:37,579 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:37,587 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:38,315 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-21 03:22:38,316 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:38,717 WARN L143 SmtUtils]: Spent 220ms on a formula simplification that was a NOOP. DAG size: 52 [2018-01-21 03:22:38,893 WARN L143 SmtUtils]: Spent 175ms on a formula simplification that was a NOOP. DAG size: 52 [2018-01-21 03:22:40,481 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 03:22:40,502 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:40,503 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:40,506 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:40,506 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:40,532 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:40,605 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:40,681 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:40,698 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:40,809 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-21 03:22:40,809 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:41,044 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 03:22:41,046 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:41,046 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-21 03:22:41,046 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:41,047 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 03:22:41,047 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 03:22:41,048 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=685, Invalid=1765, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 03:22:41,048 INFO L87 Difference]: Start difference. First operand 144 states and 155 transitions. Second operand 34 states. [2018-01-21 03:22:41,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:41,653 INFO L93 Difference]: Finished difference Result 288 states and 314 transitions. [2018-01-21 03:22:41,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 03:22:41,653 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 425 [2018-01-21 03:22:41,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:41,654 INFO L225 Difference]: With dead ends: 288 [2018-01-21 03:22:41,654 INFO L226 Difference]: Without dead ends: 152 [2018-01-21 03:22:41,656 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1732 GetRequests, 1666 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1321, Invalid=2969, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 03:22:41,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-01-21 03:22:41,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 149. [2018-01-21 03:22:41,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-01-21 03:22:41,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 160 transitions. [2018-01-21 03:22:41,664 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 160 transitions. Word has length 425 [2018-01-21 03:22:41,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:41,664 INFO L432 AbstractCegarLoop]: Abstraction has 149 states and 160 transitions. [2018-01-21 03:22:41,665 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 03:22:41,665 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 160 transitions. [2018-01-21 03:22:41,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2018-01-21 03:22:41,668 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:41,668 INFO L322 BasicCegarLoop]: trace histogram [80, 75, 75, 75, 75, 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 03:22:41,668 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:41,669 INFO L82 PathProgramCache]: Analyzing trace with hash -877517212, now seen corresponding path program 15 times [2018-01-21 03:22:41,669 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:41,669 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:41,669 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:41,670 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:41,670 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:41,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:41,708 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:42,211 WARN L146 SmtUtils]: Spent 100ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 03:22:42,735 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 14 proven. 5315 refuted. 0 times theorem prover too weak. 9416 trivial. 0 not checked. [2018-01-21 03:22:42,735 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:42,735 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:42,736 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:42,736 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:42,736 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:42,736 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:42,741 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:42,741 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:42,765 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,768 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,772 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,776 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,783 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,788 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,794 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,799 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,806 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,813 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,821 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,829 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,837 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,846 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,856 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,882 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,899 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:42,902 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:42,908 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:44,186 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-21 03:22:44,187 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:45,875 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-21 03:22:45,911 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:45,911 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:45,915 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:45,915 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:45,958 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:45,970 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:45,991 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:46,023 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:46,086 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:46,206 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:46,410 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:46,727 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:47,186 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:48,066 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command Received shutdown request... [2018-01-21 03:22:48,781 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:49,927 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown