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_imprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 00:49:57,632 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 00:49:57,635 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 00:49:57,651 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 00:49:57,652 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 00:49:57,653 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 00:49:57,654 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 00:49:57,656 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 00:49:57,658 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 00:49:57,659 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 00:49:57,660 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 00:49:57,660 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 00:49:57,661 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 00:49:57,663 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 00:49:57,663 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 00:49:57,666 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 00:49:57,668 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 00:49:57,670 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 00:49:57,672 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 00:49:57,673 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 00:49:57,675 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 00:49:57,680 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 00:49:57,681 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 00:49:57,681 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_imprecise.epf [2018-01-21 00:49:57,691 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 00:49:57,692 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 00:49:57,692 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 00:49:57,693 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 00:49:57,693 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 00:49:57,693 INFO L133 SettingsManager]: * Deactivate Weak Equivalences=true [2018-01-21 00:49:57,693 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 00:49:57,693 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 00:49:57,694 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 00:49:57,694 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 00:49:57,694 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 00:49:57,694 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 00:49:57,695 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 00:49:57,695 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 00:49:57,695 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 00:49:57,695 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 00:49:57,695 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 00:49:57,695 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 00:49:57,696 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 00:49:57,696 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 00:49:57,696 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 00:49:57,696 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 00:49:57,696 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 00:49:57,697 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 00:49:57,697 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 00:49:57,697 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 00:49:57,697 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 00:49:57,697 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 00:49:57,698 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 00:49:57,698 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 00:49:57,698 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 00:49:57,698 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 00:49:57,698 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 00:49:57,699 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 00:49:57,699 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 00:49:57,699 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 00:49:57,699 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 00:49:57,700 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 00:49:57,700 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 00:49:57,735 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 00:49:57,748 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 00:49:57,752 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 00:49:57,754 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 00:49:57,754 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 00:49:57,755 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 00:49:57,869 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 00:49:57,874 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 00:49:57,875 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 00:49:57,875 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 00:49:57,880 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 00:49:57,880 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:49:57" (1/1) ... [2018-01-21 00:49:57,883 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fff9275 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:57, skipping insertion in model container [2018-01-21 00:49:57,883 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:49:57" (1/1) ... [2018-01-21 00:49:57,902 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:49:57,917 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:49:58,026 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:49:58,041 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:49:58,048 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58 WrapperNode [2018-01-21 00:49:58,048 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 00:49:58,049 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 00:49:58,049 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 00:49:58,049 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 00:49:58,062 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58" (1/1) ... [2018-01-21 00:49:58,062 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58" (1/1) ... [2018-01-21 00:49:58,069 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58" (1/1) ... [2018-01-21 00:49:58,069 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58" (1/1) ... [2018-01-21 00:49:58,072 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58" (1/1) ... [2018-01-21 00:49:58,076 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58" (1/1) ... [2018-01-21 00:49:58,077 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58" (1/1) ... [2018-01-21 00:49:58,078 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 00:49:58,078 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 00:49:58,078 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 00:49:58,078 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 00:49:58,079 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58" (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 00:49:58,125 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 00:49:58,126 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 00:49:58,126 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 00:49:58,126 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 00:49:58,126 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 00:49:58,126 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 00:49:58,126 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 00:49:58,126 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 00:49:58,126 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 00:49:58,126 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 00:49:58,127 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 00:49:58,127 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 00:49:58,127 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 00:49:58,275 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 00:49:58,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:49:58 BoogieIcfgContainer [2018-01-21 00:49:58,276 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 00:49:58,277 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 00:49:58,277 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 00:49:58,278 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 00:49:58,279 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 12:49:57" (1/3) ... [2018-01-21 00:49:58,279 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e682505 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:49:58, skipping insertion in model container [2018-01-21 00:49:58,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:49:58" (2/3) ... [2018-01-21 00:49:58,280 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e682505 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:49:58, skipping insertion in model container [2018-01-21 00:49:58,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:49:58" (3/3) ... [2018-01-21 00:49:58,281 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 00:49:58,287 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 00:49:58,293 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 00:49:58,332 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:49:58,332 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:49:58,332 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:49:58,332 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:49:58,332 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:49:58,332 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:49:58,332 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:49:58,332 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 00:49:58,333 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:49:58,351 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 00:49:58,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 00:49:58,357 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:49:58,358 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 00:49:58,359 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 00:49:58,364 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 00:49:58,367 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:49:58,412 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,412 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:49:58,412 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,412 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:49:58,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:49:58,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:49:58,466 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 00:49:58,473 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:49:58,478 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:49:58,478 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:49:58,478 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:49:58,479 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:49:58,479 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:49:58,479 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:49:58,479 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:49:58,479 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 00:49:58,479 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:49:58,480 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 00:49:58,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 00:49:58,481 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:49:58,482 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:49:58,482 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 00:49:58,482 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 00:49:58,482 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:49:58,483 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,483 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:49:58,483 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,483 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:49:58,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:49:58,506 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:49:58,538 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 00:49:58,539 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:49:58,540 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:49:58,540 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:49:58,541 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:49:58,551 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:49:58,552 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:49:58,554 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 00:49:58,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:49:58,582 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 00:49:58,583 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:49:58,584 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 00:49:58,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:49:58,592 INFO L225 Difference]: With dead ends: 72 [2018-01-21 00:49:58,593 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 00:49:58,596 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 00:49:58,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 00:49:58,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 00:49:58,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 00:49:58,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 00:49:58,688 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 00:49:58,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:49:58,689 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 00:49:58,689 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:49:58,689 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 00:49:58,689 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 00:49:58,692 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:49:58,692 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:49:58,692 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:49:58,692 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:49:58,692 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:49:58,693 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:49:58,693 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:49:58,693 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 00:49:58,693 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:49:58,695 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 00:49:58,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 00:49:58,696 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:49:58,696 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 00:49:58,696 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:49:58,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 00:49:58,697 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:49:58,698 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,698 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:49:58,698 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,698 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:49:58,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:49:58,705 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:49:58,715 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 00:49:58,715 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:49:58,715 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:49:58,715 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:49:58,715 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:49:58,716 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:49:58,716 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:49:58,716 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 00:49:58,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:49:58,720 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 00:49:58,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:49:58,720 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 00:49:58,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:49:58,722 INFO L225 Difference]: With dead ends: 72 [2018-01-21 00:49:58,722 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 00:49:58,722 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 00:49:58,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 00:49:58,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 00:49:58,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 00:49:58,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 00:49:58,732 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 00:49:58,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:49:58,733 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 00:49:58,733 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:49:58,733 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 00:49:58,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 00:49:58,733 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:49:58,734 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 00:49:58,734 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:49:58,734 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 00:49:58,734 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:49:58,735 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,735 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:49:58,735 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,735 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:49:58,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:49:58,746 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:49:58,777 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 00:49:58,777 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:49:58,778 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 00:49:58,778 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:49:58,779 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 00:49:58,780 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 00:49:58,780 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 00:49:58,780 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 00:49:58,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:49:58,818 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 00:49:58,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 00:49:58,819 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 00:49:58,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:49:58,822 INFO L225 Difference]: With dead ends: 66 [2018-01-21 00:49:58,823 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 00:49:58,824 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 00:49:58,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 00:49:58,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 00:49:58,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 00:49:58,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 00:49:58,836 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 00:49:58,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:49:58,836 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 00:49:58,836 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 00:49:58,836 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 00:49:58,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 00:49:58,837 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:49:58,838 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 00:49:58,838 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:49:58,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 00:49:58,838 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:49:58,839 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,839 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:49:58,839 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:58,839 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:49:58,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:49:58,859 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:49:59,041 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:49:59,041 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:49:59,041 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:49:59,042 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 00:49:59,044 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 00:49:59,087 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:49:59,087 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:49:59,374 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:49:59,375 INFO L268 AbstractInterpreter]: Visited 30 different actions 66 times. Merged at 14 different actions 22 times. Never widened. Found 3 fixpoints after 3 different actions. Largest state had 18 variables. [2018-01-21 00:49:59,384 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:49:59,385 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:49:59,385 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 00:49:59,396 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:49:59,397 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:49:59,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:49:59,436 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:49:59,477 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:49:59,477 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:49:59,523 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:49:59,558 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:49:59,558 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 00:49:59,562 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:49:59,563 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:49:59,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:49:59,600 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:49:59,607 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:49:59,607 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:49:59,640 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:49:59,641 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:49:59,642 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4, 4, 4] total 12 [2018-01-21 00:49:59,642 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:49:59,642 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 00:49:59,642 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 00:49:59,643 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-01-21 00:49:59,643 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-01-21 00:49:59,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:49:59,919 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2018-01-21 00:49:59,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 00:49:59,921 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-01-21 00:49:59,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:49:59,923 INFO L225 Difference]: With dead ends: 96 [2018-01-21 00:49:59,924 INFO L226 Difference]: Without dead ends: 79 [2018-01-21 00:49:59,924 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:49:59,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-01-21 00:49:59,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 50. [2018-01-21 00:49:59,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 00:49:59,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-01-21 00:49:59,934 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 31 [2018-01-21 00:49:59,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:49:59,934 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-01-21 00:49:59,934 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 00:49:59,934 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-01-21 00:49:59,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 00:49:59,936 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:49:59,936 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:49:59,936 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:49:59,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1947199059, now seen corresponding path program 2 times [2018-01-21 00:49:59,937 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:49:59,938 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:59,938 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:49:59,938 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:49:59,938 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:49:59,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:49:59,959 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:00,010 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 00:50:00,011 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:00,011 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:00,011 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:00,011 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:00,012 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:00,012 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 00:50:00,021 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:50:00,021 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:00,036 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:00,048 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:00,050 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:00,054 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:00,131 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 00:50:00,131 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:00,291 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 00:50:00,312 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 00:50:00,312 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-21 00:50:00,313 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:50:00,313 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 00:50:00,313 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 00:50:00,314 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-21 00:50:00,314 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-01-21 00:50:00,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:00,400 INFO L93 Difference]: Finished difference Result 98 states and 109 transitions. [2018-01-21 00:50:00,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 00:50:00,400 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2018-01-21 00:50:00,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:00,402 INFO L225 Difference]: With dead ends: 98 [2018-01-21 00:50:00,402 INFO L226 Difference]: Without dead ends: 63 [2018-01-21 00:50:00,403 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 00:50:00,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-01-21 00:50:00,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2018-01-21 00:50:00,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-21 00:50:00,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2018-01-21 00:50:00,408 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 42 [2018-01-21 00:50:00,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:00,409 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2018-01-21 00:50:00,409 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 00:50:00,409 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2018-01-21 00:50:00,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 00:50:00,410 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:00,410 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:00,410 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:00,410 INFO L82 PathProgramCache]: Analyzing trace with hash 84514625, now seen corresponding path program 1 times [2018-01-21 00:50:00,410 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:00,411 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:00,411 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:00,411 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:00,412 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:00,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:00,430 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:00,477 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:00,477 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:00,477 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:00,477 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 48 with the following transitions: [2018-01-21 00:50:00,478 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 00:50:00,479 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:50:00,480 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:50:00,740 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:50:00,741 INFO L268 AbstractInterpreter]: Visited 34 different actions 109 times. Merged at 22 different actions 50 times. Never widened. Found 9 fixpoints after 6 different actions. Largest state had 21 variables. [2018-01-21 00:50:00,743 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:50:00,743 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:00,743 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:00,766 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:00,766 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:50:00,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:00,798 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:00,809 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:00,809 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:00,867 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:00,888 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:00,888 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:00,891 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:00,891 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:50:00,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:00,930 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:00,936 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:00,936 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:00,965 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:00,968 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:00,968 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 00:50:00,968 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:00,969 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 00:50:00,969 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 00:50:00,969 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 00:50:00,969 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand 6 states. [2018-01-21 00:50:01,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:01,056 INFO L93 Difference]: Finished difference Result 105 states and 119 transitions. [2018-01-21 00:50:01,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 00:50:01,057 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-21 00:50:01,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:01,058 INFO L225 Difference]: With dead ends: 105 [2018-01-21 00:50:01,058 INFO L226 Difference]: Without dead ends: 84 [2018-01-21 00:50:01,059 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 00:50:01,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-01-21 00:50:01,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 64. [2018-01-21 00:50:01,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-01-21 00:50:01,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2018-01-21 00:50:01,068 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 47 [2018-01-21 00:50:01,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:01,069 INFO L432 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2018-01-21 00:50:01,069 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 00:50:01,069 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2018-01-21 00:50:01,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-01-21 00:50:01,071 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:01,071 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:01,071 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:01,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1267511486, now seen corresponding path program 2 times [2018-01-21 00:50:01,071 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:01,072 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:01,073 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:01,073 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:01,073 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:01,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:01,095 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:01,178 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:50:01,178 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:01,178 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:01,178 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:01,178 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:01,179 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:01,179 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:01,186 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:50:01,187 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:01,199 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:01,214 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:01,217 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:01,221 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:01,292 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 00:50:01,292 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:01,415 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 00:50:01,435 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:01,436 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:01,440 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:50:01,440 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:01,453 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:01,483 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:01,507 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:01,513 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:01,569 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:50:01,570 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:01,633 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:50:01,636 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:01,636 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 00:50:01,636 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:01,637 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 00:50:01,637 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 00:50:01,638 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-21 00:50:01,638 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand 12 states. [2018-01-21 00:50:01,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:01,861 INFO L93 Difference]: Finished difference Result 172 states and 198 transitions. [2018-01-21 00:50:01,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 00:50:01,862 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 63 [2018-01-21 00:50:01,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:01,863 INFO L225 Difference]: With dead ends: 172 [2018-01-21 00:50:01,864 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 00:50:01,865 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 234 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-21 00:50:01,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 00:50:01,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 89. [2018-01-21 00:50:01,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-01-21 00:50:01,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2018-01-21 00:50:01,877 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 63 [2018-01-21 00:50:01,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:01,877 INFO L432 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2018-01-21 00:50:01,877 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 00:50:01,877 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2018-01-21 00:50:01,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-01-21 00:50:01,878 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:01,879 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:01,879 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:01,879 INFO L82 PathProgramCache]: Analyzing trace with hash 86499937, now seen corresponding path program 3 times [2018-01-21 00:50:01,879 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:01,880 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:01,880 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:01,880 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:01,880 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:01,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:01,906 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:02,017 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-21 00:50:02,017 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:02,017 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:02,018 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:02,018 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:02,019 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:02,019 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:02,025 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:50:02,025 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:50:02,039 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:02,045 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:02,050 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:02,057 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:02,059 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:02,064 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:02,145 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 00:50:02,145 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:02,335 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 00:50:02,355 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:02,355 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:02,359 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:50:02,359 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:50:02,371 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:02,382 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:02,401 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:02,430 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:02,442 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:02,447 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:02,457 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 00:50:02,457 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:02,532 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 00:50:02,533 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:02,534 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-21 00:50:02,534 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:02,534 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 00:50:02,534 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 00:50:02,534 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:50:02,535 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand 11 states. [2018-01-21 00:50:02,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:02,706 INFO L93 Difference]: Finished difference Result 215 states and 249 transitions. [2018-01-21 00:50:02,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 00:50:02,706 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 89 [2018-01-21 00:50:02,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:02,708 INFO L225 Difference]: With dead ends: 215 [2018-01-21 00:50:02,708 INFO L226 Difference]: Without dead ends: 186 [2018-01-21 00:50:02,709 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 344 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-21 00:50:02,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-01-21 00:50:02,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 127. [2018-01-21 00:50:02,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-01-21 00:50:02,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 147 transitions. [2018-01-21 00:50:02,721 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 147 transitions. Word has length 89 [2018-01-21 00:50:02,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:02,721 INFO L432 AbstractCegarLoop]: Abstraction has 127 states and 147 transitions. [2018-01-21 00:50:02,722 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 00:50:02,722 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 147 transitions. [2018-01-21 00:50:02,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-01-21 00:50:02,723 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:02,724 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:02,724 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:02,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1835683312, now seen corresponding path program 4 times [2018-01-21 00:50:02,724 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:02,725 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:02,725 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:02,725 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:02,725 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:02,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:02,755 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:02,847 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-21 00:50:02,848 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:02,848 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:02,848 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:02,848 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:02,848 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:02,848 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:02,854 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:50:02,855 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:50:02,883 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:02,886 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:03,082 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 00:50:03,082 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:03,347 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 00:50:03,369 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:03,369 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:03,373 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:50:03,373 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:50:03,424 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:03,431 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:03,466 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 00:50:03,466 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:03,654 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 00:50:03,656 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:03,656 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-21 00:50:03,656 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:03,657 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 00:50:03,657 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 00:50:03,657 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-21 00:50:03,657 INFO L87 Difference]: Start difference. First operand 127 states and 147 transitions. Second operand 18 states. [2018-01-21 00:50:04,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:04,050 INFO L93 Difference]: Finished difference Result 335 states and 391 transitions. [2018-01-21 00:50:04,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 00:50:04,051 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 120 [2018-01-21 00:50:04,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:04,053 INFO L225 Difference]: With dead ends: 335 [2018-01-21 00:50:04,053 INFO L226 Difference]: Without dead ends: 258 [2018-01-21 00:50:04,054 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 452 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-21 00:50:04,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-01-21 00:50:04,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 162. [2018-01-21 00:50:04,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-01-21 00:50:04,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 187 transitions. [2018-01-21 00:50:04,071 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 187 transitions. Word has length 120 [2018-01-21 00:50:04,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:04,071 INFO L432 AbstractCegarLoop]: Abstraction has 162 states and 187 transitions. [2018-01-21 00:50:04,071 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 00:50:04,071 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 187 transitions. [2018-01-21 00:50:04,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-01-21 00:50:04,073 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:04,073 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:04,073 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:04,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1639693249, now seen corresponding path program 5 times [2018-01-21 00:50:04,073 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:04,074 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:04,074 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:04,074 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:04,074 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:04,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:04,106 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:04,276 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-21 00:50:04,276 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:04,276 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:04,277 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:04,277 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:04,277 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:04,277 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:04,282 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:50:04,282 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:04,293 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,296 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,299 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,302 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,306 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,311 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,312 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:04,315 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:04,401 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 00:50:04,402 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:04,593 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 00:50:04,615 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:04,615 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:04,618 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:50:04,618 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:04,630 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,635 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,645 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,658 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,680 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,709 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:04,725 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:04,731 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:04,750 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 00:50:04,750 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:05,016 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 00:50:05,018 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:05,019 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-21 00:50:05,019 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:05,019 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 00:50:05,020 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 00:50:05,020 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-21 00:50:05,020 INFO L87 Difference]: Start difference. First operand 162 states and 187 transitions. Second operand 18 states. [2018-01-21 00:50:05,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:05,478 INFO L93 Difference]: Finished difference Result 376 states and 433 transitions. [2018-01-21 00:50:05,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 00:50:05,478 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 151 [2018-01-21 00:50:05,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:05,479 INFO L225 Difference]: With dead ends: 376 [2018-01-21 00:50:05,480 INFO L226 Difference]: Without dead ends: 225 [2018-01-21 00:50:05,481 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 583 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 00:50:05,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-01-21 00:50:05,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 166. [2018-01-21 00:50:05,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-01-21 00:50:05,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 187 transitions. [2018-01-21 00:50:05,494 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 187 transitions. Word has length 151 [2018-01-21 00:50:05,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:05,494 INFO L432 AbstractCegarLoop]: Abstraction has 166 states and 187 transitions. [2018-01-21 00:50:05,494 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 00:50:05,494 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 187 transitions. [2018-01-21 00:50:05,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-01-21 00:50:05,497 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:05,497 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:05,497 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:05,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1261295644, now seen corresponding path program 6 times [2018-01-21 00:50:05,498 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:05,498 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:05,499 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:05,499 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:05,499 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:05,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:05,528 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:05,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:50:05,675 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:05,675 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:05,675 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:05,675 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:05,675 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:05,675 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:05,681 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:50:05,681 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:50:05,694 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,696 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,698 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,702 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,715 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,720 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,725 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,730 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,736 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,738 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:05,741 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:05,769 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:50:05,769 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:05,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:50:05,901 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:05,901 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:05,904 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:50:05,904 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:50:05,921 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,929 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,947 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:05,972 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:06,006 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:06,057 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:06,133 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:06,286 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:06,476 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:06,512 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:06,520 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:06,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:50:06,538 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:06,608 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:50:06,611 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:06,611 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 00:50:06,611 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:06,612 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 00:50:06,612 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 00:50:06,612 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 00:50:06,612 INFO L87 Difference]: Start difference. First operand 166 states and 187 transitions. Second operand 11 states. [2018-01-21 00:50:06,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:06,729 INFO L93 Difference]: Finished difference Result 261 states and 295 transitions. [2018-01-21 00:50:06,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 00:50:06,730 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 187 [2018-01-21 00:50:06,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:06,732 INFO L225 Difference]: With dead ends: 261 [2018-01-21 00:50:06,732 INFO L226 Difference]: Without dead ends: 220 [2018-01-21 00:50:06,733 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 739 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 00:50:06,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-21 00:50:06,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 175. [2018-01-21 00:50:06,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-01-21 00:50:06,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 198 transitions. [2018-01-21 00:50:06,744 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 198 transitions. Word has length 187 [2018-01-21 00:50:06,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:06,744 INFO L432 AbstractCegarLoop]: Abstraction has 175 states and 198 transitions. [2018-01-21 00:50:06,744 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 00:50:06,744 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 198 transitions. [2018-01-21 00:50:06,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-01-21 00:50:06,748 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:06,748 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:06,748 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:06,748 INFO L82 PathProgramCache]: Analyzing trace with hash 2078734259, now seen corresponding path program 7 times [2018-01-21 00:50:06,748 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:06,749 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:06,749 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:06,749 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:06,749 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:06,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:06,790 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:07,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-21 00:50:07,355 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:07,355 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:07,355 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:07,355 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:07,355 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:07,356 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:07,362 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:07,362 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:50:07,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:07,413 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:07,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 00:50:07,560 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:07,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 00:50:07,820 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:07,821 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:07,823 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:07,824 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:50:07,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:07,919 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:07,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 00:50:07,966 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:08,154 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 00:50:08,156 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:08,156 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-21 00:50:08,156 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:08,156 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 00:50:08,157 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 00:50:08,157 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-21 00:50:08,157 INFO L87 Difference]: Start difference. First operand 175 states and 198 transitions. Second operand 23 states. [2018-01-21 00:50:08,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:08,576 INFO L93 Difference]: Finished difference Result 454 states and 513 transitions. [2018-01-21 00:50:08,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 00:50:08,576 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 218 [2018-01-21 00:50:08,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:08,578 INFO L225 Difference]: With dead ends: 454 [2018-01-21 00:50:08,578 INFO L226 Difference]: Without dead ends: 360 [2018-01-21 00:50:08,579 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 894 GetRequests, 839 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 00:50:08,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-01-21 00:50:08,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 215. [2018-01-21 00:50:08,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-01-21 00:50:08,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 244 transitions. [2018-01-21 00:50:08,596 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 244 transitions. Word has length 218 [2018-01-21 00:50:08,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:08,597 INFO L432 AbstractCegarLoop]: Abstraction has 215 states and 244 transitions. [2018-01-21 00:50:08,597 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 00:50:08,597 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 244 transitions. [2018-01-21 00:50:08,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2018-01-21 00:50:08,602 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:08,602 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:08,602 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:08,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1659522376, now seen corresponding path program 8 times [2018-01-21 00:50:08,603 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:08,603 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:08,603 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:08,604 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:08,604 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:08,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:08,643 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:08,884 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-21 00:50:08,884 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:08,884 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:08,885 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:08,885 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:08,885 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:08,885 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:08,890 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:50:08,890 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:08,910 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:08,945 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:08,954 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:08,959 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:09,116 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 00:50:09,117 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:09,451 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 00:50:09,471 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:09,472 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:09,474 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:50:09,475 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:09,495 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:09,552 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:09,594 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:09,604 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:09,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 00:50:09,667 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:09,953 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 00:50:09,955 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:09,955 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-21 00:50:09,955 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:09,956 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 00:50:09,956 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 00:50:09,956 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-21 00:50:09,956 INFO L87 Difference]: Start difference. First operand 215 states and 244 transitions. Second operand 26 states. [2018-01-21 00:50:10,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:10,897 INFO L93 Difference]: Finished difference Result 559 states and 631 transitions. [2018-01-21 00:50:10,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 00:50:10,897 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 269 [2018-01-21 00:50:10,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:10,900 INFO L225 Difference]: With dead ends: 559 [2018-01-21 00:50:10,900 INFO L226 Difference]: Without dead ends: 453 [2018-01-21 00:50:10,902 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1101 GetRequests, 1038 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 00:50:10,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2018-01-21 00:50:10,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 260. [2018-01-21 00:50:10,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2018-01-21 00:50:10,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 296 transitions. [2018-01-21 00:50:10,924 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 296 transitions. Word has length 269 [2018-01-21 00:50:10,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:10,924 INFO L432 AbstractCegarLoop]: Abstraction has 260 states and 296 transitions. [2018-01-21 00:50:10,924 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 00:50:10,924 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 296 transitions. [2018-01-21 00:50:10,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-01-21 00:50:10,927 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:10,927 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:10,928 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:10,928 INFO L82 PathProgramCache]: Analyzing trace with hash 469392129, now seen corresponding path program 9 times [2018-01-21 00:50:10,928 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:10,929 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:10,929 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:10,929 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:10,929 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:10,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:10,968 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:11,213 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-21 00:50:11,213 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:11,213 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:11,213 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:11,213 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:11,213 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:11,213 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:11,218 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:50:11,218 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:50:11,244 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:11,247 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:11,251 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:11,256 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:11,262 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:11,267 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:11,273 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:11,282 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:11,283 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:11,288 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:11,563 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 00:50:11,563 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:11,906 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 00:50:11,941 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:11,941 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:11,945 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:50:11,945 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:50:11,975 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:11,986 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:12,013 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:12,047 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:12,117 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:12,300 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:12,629 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:13,184 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:13,222 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:13,231 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:13,285 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 00:50:13,285 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:13,508 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 00:50:13,511 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:13,511 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-21 00:50:13,511 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:13,511 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 00:50:13,512 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 00:50:13,512 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-21 00:50:13,512 INFO L87 Difference]: Start difference. First operand 260 states and 296 transitions. Second operand 21 states. [2018-01-21 00:50:13,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:13,880 INFO L93 Difference]: Finished difference Result 639 states and 732 transitions. [2018-01-21 00:50:13,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 00:50:13,880 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 325 [2018-01-21 00:50:13,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:13,884 INFO L225 Difference]: With dead ends: 639 [2018-01-21 00:50:13,884 INFO L226 Difference]: Without dead ends: 586 [2018-01-21 00:50:13,885 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1318 GetRequests, 1280 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 00:50:13,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2018-01-21 00:50:13,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 318. [2018-01-21 00:50:13,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2018-01-21 00:50:13,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 367 transitions. [2018-01-21 00:50:13,909 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 367 transitions. Word has length 325 [2018-01-21 00:50:13,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:13,910 INFO L432 AbstractCegarLoop]: Abstraction has 318 states and 367 transitions. [2018-01-21 00:50:13,910 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 00:50:13,910 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 367 transitions. [2018-01-21 00:50:13,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-01-21 00:50:13,913 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:13,914 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:13,914 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:13,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1594188886, now seen corresponding path program 10 times [2018-01-21 00:50:13,914 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:13,915 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:13,915 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:13,915 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:13,915 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:13,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:13,960 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:14,424 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-21 00:50:14,425 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:14,425 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:14,425 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:14,425 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:14,425 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:14,425 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:14,431 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:50:14,431 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:50:14,498 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:14,504 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:14,805 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 00:50:14,805 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:15,209 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 00:50:15,229 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:15,229 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:15,232 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:50:15,232 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:50:15,362 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:15,372 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:15,439 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 00:50:15,440 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:15,759 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 00:50:15,761 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:15,761 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-21 00:50:15,762 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:15,762 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 00:50:15,763 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 00:50:15,763 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 00:50:15,763 INFO L87 Difference]: Start difference. First operand 318 states and 367 transitions. Second operand 32 states. [2018-01-21 00:50:16,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:16,838 INFO L93 Difference]: Finished difference Result 837 states and 962 transitions. [2018-01-21 00:50:16,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 00:50:16,838 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 386 [2018-01-21 00:50:16,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:16,843 INFO L225 Difference]: With dead ends: 837 [2018-01-21 00:50:16,843 INFO L226 Difference]: Without dead ends: 697 [2018-01-21 00:50:16,846 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1575 GetRequests, 1496 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 00:50:16,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2018-01-21 00:50:16,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 373. [2018-01-21 00:50:16,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373 states. [2018-01-21 00:50:16,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 428 transitions. [2018-01-21 00:50:16,875 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 428 transitions. Word has length 386 [2018-01-21 00:50:16,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:16,876 INFO L432 AbstractCegarLoop]: Abstraction has 373 states and 428 transitions. [2018-01-21 00:50:16,876 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 00:50:16,876 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 428 transitions. [2018-01-21 00:50:16,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2018-01-21 00:50:16,879 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:16,880 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:16,880 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:16,880 INFO L82 PathProgramCache]: Analyzing trace with hash -655925471, now seen corresponding path program 11 times [2018-01-21 00:50:16,880 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:16,881 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:16,881 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:16,881 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:16,881 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:16,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:16,929 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:17,495 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-21 00:50:17,495 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:17,495 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:17,496 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:17,496 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:17,496 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:17,496 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:17,502 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:50:17,503 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:17,531 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:17,538 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:17,545 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:17,553 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:17,562 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:17,571 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:17,581 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:17,592 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:17,593 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:17,601 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:17,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 00:50:17,898 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:18,623 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 00:50:18,656 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:18,656 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:18,660 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:50:18,660 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:18,704 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:18,728 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:18,778 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:18,854 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:18,968 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:19,136 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:19,358 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:19,703 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:19,770 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:19,785 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:19,893 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 00:50:19,893 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:20,380 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 00:50:20,383 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:20,384 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19, 19, 19, 19] total 40 [2018-01-21 00:50:20,384 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:20,385 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 00:50:20,385 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 00:50:20,385 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1305, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 00:50:20,386 INFO L87 Difference]: Start difference. First operand 373 states and 428 transitions. Second operand 32 states. [2018-01-21 00:50:21,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:21,478 INFO L93 Difference]: Finished difference Result 727 states and 820 transitions. [2018-01-21 00:50:21,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 00:50:21,478 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 447 [2018-01-21 00:50:21,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:21,481 INFO L225 Difference]: With dead ends: 727 [2018-01-21 00:50:21,481 INFO L226 Difference]: Without dead ends: 575 [2018-01-21 00:50:21,482 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1842 GetRequests, 1753 SyntacticMatches, 22 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1373 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=773, Invalid=3919, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 00:50:21,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2018-01-21 00:50:21,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 374. [2018-01-21 00:50:21,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2018-01-21 00:50:21,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 429 transitions. [2018-01-21 00:50:21,500 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 429 transitions. Word has length 447 [2018-01-21 00:50:21,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:21,501 INFO L432 AbstractCegarLoop]: Abstraction has 374 states and 429 transitions. [2018-01-21 00:50:21,501 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 00:50:21,501 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 429 transitions. [2018-01-21 00:50:21,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2018-01-21 00:50:21,503 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:21,504 INFO L322 BasicCegarLoop]: trace histogram [81, 68, 68, 68, 68, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:21,504 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:21,504 INFO L82 PathProgramCache]: Analyzing trace with hash 832198916, now seen corresponding path program 12 times [2018-01-21 00:50:21,504 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:21,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:21,505 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:21,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:21,505 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:21,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:21,542 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:22,423 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 0 proven. 416 refuted. 0 times theorem prover too weak. 13626 trivial. 0 not checked. [2018-01-21 00:50:22,423 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:22,423 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:22,424 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:22,424 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:22,424 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:22,424 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:22,429 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:50:22,429 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:50:22,459 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,463 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,467 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,474 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,479 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,494 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,500 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,510 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,520 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,530 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,541 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,552 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,566 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,579 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,593 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,609 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:22,612 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:22,620 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:22,885 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 00:50:22,885 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:23,225 WARN L143 SmtUtils]: Spent 110ms on a formula simplification that was a NOOP. DAG size: 36 [2018-01-21 00:50:23,335 WARN L143 SmtUtils]: Spent 108ms on a formula simplification that was a NOOP. DAG size: 36 [2018-01-21 00:50:24,198 WARN L143 SmtUtils]: Spent 164ms on a formula simplification that was a NOOP. DAG size: 36 [2018-01-21 00:50:24,956 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 00:50:24,978 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:24,978 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 28 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:50:24,982 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:50:24,982 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:50:25,023 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:25,037 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:25,077 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:25,135 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:25,294 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:25,674 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:28,804 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:32,019 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:50:44,059 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown