java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 03:15:54,262 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 03:15:54,337 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 03:15:54,354 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 03:15:54,354 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 03:15:54,355 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 03:15:54,356 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 03:15:54,358 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 03:15:54,360 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 03:15:54,361 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 03:15:54,362 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 03:15:54,362 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 03:15:54,363 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 03:15:54,365 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 03:15:54,366 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 03:15:54,368 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 03:15:54,370 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 03:15:54,373 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 03:15:54,374 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 03:15:54,375 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 03:15:54,378 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 03:15:54,383 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 03:15:54,384 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 03:15:54,384 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf [2018-01-21 03:15:54,393 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 03:15:54,393 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 03:15:54,394 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 03:15:54,394 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 03:15:54,394 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 03:15:54,394 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 03:15:54,394 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 03:15:54,394 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 03:15:54,394 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 03:15:54,395 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 03:15:54,395 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 03:15:54,395 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 03:15:54,396 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 03:15:54,396 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 03:15:54,396 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 03:15:54,396 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 03:15:54,396 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 03:15:54,396 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 03:15:54,396 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 03:15:54,397 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 03:15:54,397 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 03:15:54,397 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 03:15:54,397 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 03:15:54,397 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 03:15:54,398 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 03:15:54,398 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 03:15:54,398 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 03:15:54,398 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:15:54,398 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 03:15:54,398 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 03:15:54,398 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 03:15:54,399 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 03:15:54,399 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 03:15:54,399 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 03:15:54,399 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 03:15:54,399 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 03:15:54,399 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 03:15:54,399 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 03:15:54,400 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 03:15:54,400 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 03:15:54,434 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 03:15:54,445 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 03:15:54,450 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 03:15:54,454 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 03:15:54,454 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 03:15:54,455 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 03:15:54,650 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 03:15:54,656 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 03:15:54,657 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 03:15:54,657 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 03:15:54,665 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 03:15:54,666 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:15:54" (1/1) ... [2018-01-21 03:15:54,669 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60b199dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54, skipping insertion in model container [2018-01-21 03:15:54,670 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:15:54" (1/1) ... [2018-01-21 03:15:54,689 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:15:54,708 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:15:54,842 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:15:54,865 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:15:54,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54 WrapperNode [2018-01-21 03:15:54,872 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 03:15:54,873 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 03:15:54,873 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 03:15:54,873 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 03:15:54,885 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54" (1/1) ... [2018-01-21 03:15:54,885 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54" (1/1) ... [2018-01-21 03:15:54,892 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54" (1/1) ... [2018-01-21 03:15:54,893 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54" (1/1) ... [2018-01-21 03:15:54,895 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54" (1/1) ... [2018-01-21 03:15:54,898 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54" (1/1) ... [2018-01-21 03:15:54,899 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54" (1/1) ... [2018-01-21 03:15:54,901 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 03:15:54,901 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 03:15:54,901 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 03:15:54,901 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 03:15:54,902 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:15:54,949 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 03:15:54,949 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 03:15:54,949 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 03:15:54,949 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 03:15:54,949 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 03:15:54,949 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 03:15:54,950 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 03:15:54,950 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 03:15:54,950 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 03:15:54,950 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 03:15:54,950 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 03:15:54,950 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 03:15:54,951 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 03:15:55,130 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 03:15:55,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:15:55 BoogieIcfgContainer [2018-01-21 03:15:55,131 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 03:15:55,132 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 03:15:55,132 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 03:15:55,134 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 03:15:55,134 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 03:15:54" (1/3) ... [2018-01-21 03:15:55,135 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1eb060af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:15:55, skipping insertion in model container [2018-01-21 03:15:55,135 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:15:54" (2/3) ... [2018-01-21 03:15:55,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1eb060af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:15:55, skipping insertion in model container [2018-01-21 03:15:55,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:15:55" (3/3) ... [2018-01-21 03:15:55,138 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 03:15:55,150 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 03:15:55,158 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 03:15:55,206 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:15:55,206 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:15:55,207 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:15:55,207 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:15:55,207 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:15:55,207 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:15:55,207 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:15:55,207 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 03:15:55,208 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:15:55,230 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 03:15:55,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 03:15:55,237 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:15:55,238 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 03:15:55,239 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 03:15:55,244 INFO L82 PathProgramCache]: Analyzing trace with hash 102829, now seen corresponding path program 1 times [2018-01-21 03:15:55,247 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:15:55,307 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,307 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:15:55,308 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,308 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:15:55,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:15:55,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:15:55,375 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:15:55,383 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:15:55,391 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:15:55,391 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:15:55,391 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:15:55,392 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:15:55,392 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:15:55,392 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:15:55,392 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:15:55,392 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 03:15:55,392 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:15:55,394 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 03:15:55,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 03:15:55,395 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:15:55,396 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:15:55,396 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 03:15:55,396 INFO L82 PathProgramCache]: Analyzing trace with hash 33657389, now seen corresponding path program 1 times [2018-01-21 03:15:55,396 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:15:55,398 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,398 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:15:55,398 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,398 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:15:55,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:15:55,429 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:15:55,467 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:15:55,469 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:15:55,470 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:15:55,470 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:15:55,472 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:15:55,483 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:15:55,484 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:15:55,487 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 03:15:55,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:15:55,520 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 03:15:55,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:15:55,522 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 03:15:55,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:15:55,530 INFO L225 Difference]: With dead ends: 76 [2018-01-21 03:15:55,531 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 03:15:55,535 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:15:55,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 03:15:55,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 03:15:55,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 03:15:55,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 03:15:55,636 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 03:15:55,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:15:55,636 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 03:15:55,636 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:15:55,636 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 03:15:55,637 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 03:15:55,639 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:15:55,639 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:15:55,639 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:15:55,639 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:15:55,639 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:15:55,639 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:15:55,639 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:15:55,639 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 03:15:55,640 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:15:55,641 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 03:15:55,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 03:15:55,642 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:15:55,642 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:15:55,642 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:15:55,642 INFO L82 PathProgramCache]: Analyzing trace with hash 1331820257, now seen corresponding path program 1 times [2018-01-21 03:15:55,643 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:15:55,644 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,644 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:15:55,644 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,644 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:15:55,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:15:55,652 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:15:55,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:15:55,663 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:15:55,664 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:15:55,664 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:15:55,664 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:15:55,664 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:15:55,665 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:15:55,665 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 03:15:55,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:15:55,669 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 03:15:55,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:15:55,669 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 03:15:55,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:15:55,671 INFO L225 Difference]: With dead ends: 76 [2018-01-21 03:15:55,671 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 03:15:55,672 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:15:55,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 03:15:55,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 03:15:55,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 03:15:55,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-01-21 03:15:55,683 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 17 [2018-01-21 03:15:55,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:15:55,684 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-01-21 03:15:55,684 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:15:55,684 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-01-21 03:15:55,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 03:15:55,685 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:15:55,685 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:15:55,685 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:15:55,685 INFO L82 PathProgramCache]: Analyzing trace with hash -1785977394, now seen corresponding path program 1 times [2018-01-21 03:15:55,685 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:15:55,686 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,686 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:15:55,686 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,686 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:15:55,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:15:55,699 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:15:55,777 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 03:15:55,777 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:15:55,777 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 03:15:55,777 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:15:55,779 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 03:15:55,780 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 03:15:55,780 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 03:15:55,780 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 3 states. [2018-01-21 03:15:55,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:15:55,855 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2018-01-21 03:15:55,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 03:15:55,855 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 03:15:55,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:15:55,858 INFO L225 Difference]: With dead ends: 58 [2018-01-21 03:15:55,858 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 03:15:55,859 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 03:15:55,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 03:15:55,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 38. [2018-01-21 03:15:55,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 03:15:55,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-01-21 03:15:55,872 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 19 [2018-01-21 03:15:55,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:15:55,872 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-01-21 03:15:55,873 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 03:15:55,873 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-01-21 03:15:55,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 03:15:55,873 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:15:55,874 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, 1, 1, 1] [2018-01-21 03:15:55,874 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:15:55,874 INFO L82 PathProgramCache]: Analyzing trace with hash -751966911, now seen corresponding path program 1 times [2018-01-21 03:15:55,874 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:15:55,875 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,875 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:15:55,875 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:55,875 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:15:55,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:15:55,894 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:15:56,026 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:15:56,026 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:15:56,027 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 03:15:56,027 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:15:56,027 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 03:15:56,028 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 03:15:56,028 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-01-21 03:15:56,028 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 6 states. [2018-01-21 03:15:56,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:15:56,141 INFO L93 Difference]: Finished difference Result 79 states and 86 transitions. [2018-01-21 03:15:56,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 03:15:56,141 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-01-21 03:15:56,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:15:56,144 INFO L225 Difference]: With dead ends: 79 [2018-01-21 03:15:56,145 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 03:15:56,145 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-01-21 03:15:56,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 03:15:56,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2018-01-21 03:15:56,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 03:15:56,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2018-01-21 03:15:56,155 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 34 [2018-01-21 03:15:56,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:15:56,155 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2018-01-21 03:15:56,155 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 03:15:56,156 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2018-01-21 03:15:56,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 03:15:56,158 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:15:56,159 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:15:56,159 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:15:56,159 INFO L82 PathProgramCache]: Analyzing trace with hash -335791331, now seen corresponding path program 1 times [2018-01-21 03:15:56,159 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:15:56,161 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:56,161 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:15:56,161 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:56,161 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:15:56,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:15:56,182 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:15:56,224 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 03:15:56,225 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:15:56,225 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:15:56,226 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-21 03:15:56,228 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [74], [76], [77], [78], [79], [80], [81] [2018-01-21 03:15:56,293 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:15:56,293 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 03:15:59,152 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 03:15:59,154 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 03:15:59,194 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 03:15:59,194 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:15:59,195 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:15:59,217 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:15:59,217 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:15:59,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:15:59,270 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:15:59,349 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 03:15:59,349 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:15:59,441 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 03:15:59,481 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:15:59,481 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:15:59,503 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:15:59,503 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:15:59,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:15:59,552 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:15:59,562 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 03:15:59,563 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:15:59,642 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [MP cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (3)] Exception during sending of exit command (exit): Broken pipe [2018-01-21 03:15:59,645 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:15:59,645 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 03:15:59,646 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:15:59,646 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 03:15:59,647 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 03:15:59,647 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 03:15:59,647 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 5 states. [2018-01-21 03:15:59,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:15:59,689 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-01-21 03:15:59,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 03:15:59,690 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 03:15:59,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:15:59,691 INFO L225 Difference]: With dead ends: 67 [2018-01-21 03:15:59,691 INFO L226 Difference]: Without dead ends: 55 [2018-01-21 03:15:59,692 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 03:15:59,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-21 03:15:59,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2018-01-21 03:15:59,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 03:15:59,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-01-21 03:15:59,715 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-01-21 03:15:59,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:15:59,716 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-01-21 03:15:59,716 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 03:15:59,716 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-01-21 03:15:59,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 03:15:59,717 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:15:59,718 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 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, 1, 1, 1, 1, 1] [2018-01-21 03:15:59,718 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:15:59,718 INFO L82 PathProgramCache]: Analyzing trace with hash -291520001, now seen corresponding path program 2 times [2018-01-21 03:15:59,718 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:15:59,719 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:59,719 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:15:59,720 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:15:59,720 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:15:59,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:15:59,743 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:15:59,876 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 03:15:59,876 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:15:59,876 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:15:59,876 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:15:59,876 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:15:59,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:15:59,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:15:59,892 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:15:59,892 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:15:59,910 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:15:59,938 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:15:59,951 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:15:59,955 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:00,159 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 03:16:00,160 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:00,627 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 03:16:00,662 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 03:16:00,662 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 11 [2018-01-21 03:16:00,662 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:16:00,663 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 03:16:00,663 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 03:16:00,664 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 03:16:00,664 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 6 states. [2018-01-21 03:16:00,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:00,949 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-21 03:16:00,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 03:16:00,950 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-21 03:16:00,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:00,952 INFO L225 Difference]: With dead ends: 86 [2018-01-21 03:16:00,952 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 03:16:00,953 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2018-01-21 03:16:00,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 03:16:00,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2018-01-21 03:16:00,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 03:16:00,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2018-01-21 03:16:00,961 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 52 [2018-01-21 03:16:00,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:00,961 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2018-01-21 03:16:00,961 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 03:16:00,962 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2018-01-21 03:16:00,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 03:16:00,963 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:00,964 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 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, 1] [2018-01-21 03:16:00,964 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:00,964 INFO L82 PathProgramCache]: Analyzing trace with hash -41114337, now seen corresponding path program 3 times [2018-01-21 03:16:00,964 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:00,965 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:00,965 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:00,966 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:00,966 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:00,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:00,997 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:01,065 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 03:16:01,065 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:01,065 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:01,065 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:01,065 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:01,065 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:01,065 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 03:16:01,084 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:16:01,085 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:16:01,103 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:01,120 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:01,143 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:01,156 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:01,163 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:01,317 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 03:16:01,317 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:01,514 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 03:16:01,535 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:01,535 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 03:16:01,538 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:16:01,538 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:16:01,551 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:01,561 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:01,577 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:01,587 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:01,592 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:01,601 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 03:16:01,601 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:01,629 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 03:16:01,630 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:01,631 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 15 [2018-01-21 03:16:01,631 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:01,631 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 03:16:01,631 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 03:16:01,632 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-01-21 03:16:01,632 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 9 states. [2018-01-21 03:16:01,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:01,759 INFO L93 Difference]: Finished difference Result 107 states and 119 transitions. [2018-01-21 03:16:01,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 03:16:01,759 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 57 [2018-01-21 03:16:01,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:01,761 INFO L225 Difference]: With dead ends: 107 [2018-01-21 03:16:01,761 INFO L226 Difference]: Without dead ends: 95 [2018-01-21 03:16:01,762 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:16:01,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-01-21 03:16:01,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 78. [2018-01-21 03:16:01,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-21 03:16:01,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 86 transitions. [2018-01-21 03:16:01,773 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 86 transitions. Word has length 57 [2018-01-21 03:16:01,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:01,774 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 86 transitions. [2018-01-21 03:16:01,774 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 03:16:01,774 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 86 transitions. [2018-01-21 03:16:01,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 03:16:01,776 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:01,776 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:01,777 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:01,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1962089693, now seen corresponding path program 4 times [2018-01-21 03:16:01,777 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:01,778 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:01,778 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:01,778 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:01,779 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:01,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:01,805 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:01,918 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 03:16:01,918 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:01,918 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:01,918 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:01,918 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:01,918 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:01,919 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 03:16:01,927 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:16:01,927 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:16:01,958 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:01,962 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:02,052 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 03:16:02,053 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:02,272 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 03:16:02,293 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:02,293 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 03:16:02,296 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:16:02,297 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:16:02,353 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:02,360 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:02,386 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 03:16:02,387 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:02,542 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 03:16:02,549 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:02,549 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9, 9, 9] total 16 [2018-01-21 03:16:02,549 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:02,550 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 03:16:02,550 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 03:16:02,551 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2018-01-21 03:16:02,551 INFO L87 Difference]: Start difference. First operand 78 states and 86 transitions. Second operand 13 states. [2018-01-21 03:16:02,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:02,742 INFO L93 Difference]: Finished difference Result 200 states and 228 transitions. [2018-01-21 03:16:02,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 03:16:02,742 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 85 [2018-01-21 03:16:02,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:02,744 INFO L225 Difference]: With dead ends: 200 [2018-01-21 03:16:02,744 INFO L226 Difference]: Without dead ends: 149 [2018-01-21 03:16:02,744 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 320 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2018-01-21 03:16:02,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-01-21 03:16:02,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 106. [2018-01-21 03:16:02,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-01-21 03:16:02,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 116 transitions. [2018-01-21 03:16:02,758 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 116 transitions. Word has length 85 [2018-01-21 03:16:02,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:02,758 INFO L432 AbstractCegarLoop]: Abstraction has 106 states and 116 transitions. [2018-01-21 03:16:02,759 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 03:16:02,759 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 116 transitions. [2018-01-21 03:16:02,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-01-21 03:16:02,761 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:02,761 INFO L322 BasicCegarLoop]: trace histogram [12, 8, 8, 8, 8, 5, 4, 4, 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, 1] [2018-01-21 03:16:02,762 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:02,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1278120925, now seen corresponding path program 5 times [2018-01-21 03:16:02,762 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:02,763 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:02,763 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:02,763 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:02,763 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:02,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:02,790 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:02,882 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-01-21 03:16:02,882 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:02,882 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:02,883 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:02,883 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:02,883 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:02,887 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 03:16:02,895 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:16:02,896 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:02,910 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:02,916 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:02,924 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:02,925 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:02,930 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:03,011 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 03:16:03,011 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:03,170 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 03:16:03,192 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:03,193 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 03:16:03,196 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:16:03,196 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:03,216 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:03,228 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:03,246 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:03,256 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:03,262 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:03,283 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 03:16:03,283 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:03,435 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 03:16:03,437 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:03,437 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-21 03:16:03,437 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:03,438 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 03:16:03,438 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 03:16:03,438 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:16:03,439 INFO L87 Difference]: Start difference. First operand 106 states and 116 transitions. Second operand 14 states. [2018-01-21 03:16:03,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:03,661 INFO L93 Difference]: Finished difference Result 180 states and 196 transitions. [2018-01-21 03:16:03,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 03:16:03,662 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 113 [2018-01-21 03:16:03,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:03,663 INFO L225 Difference]: With dead ends: 180 [2018-01-21 03:16:03,663 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 03:16:03,664 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 434 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2018-01-21 03:16:03,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 03:16:03,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 105. [2018-01-21 03:16:03,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-01-21 03:16:03,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 114 transitions. [2018-01-21 03:16:03,676 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 114 transitions. Word has length 113 [2018-01-21 03:16:03,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:03,676 INFO L432 AbstractCegarLoop]: Abstraction has 105 states and 114 transitions. [2018-01-21 03:16:03,676 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 03:16:03,676 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 114 transitions. [2018-01-21 03:16:03,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-21 03:16:03,678 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:03,678 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 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, 1] [2018-01-21 03:16:03,678 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:03,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1614733819, now seen corresponding path program 6 times [2018-01-21 03:16:03,679 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:03,679 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:03,679 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:03,680 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:03,680 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:03,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:03,711 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:03,832 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 03:16:03,832 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:03,832 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:03,832 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:03,832 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:03,832 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:03,832 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 03:16:03,837 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:16:03,838 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:16:03,851 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:03,864 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:03,869 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:03,873 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:03,877 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:03,881 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:03,887 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:03,893 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:03,902 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:03,904 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:03,910 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:03,977 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 03:16:03,977 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:04,147 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 03:16:04,168 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:04,168 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 03:16:04,172 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:16:04,173 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:16:04,189 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:04,198 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:04,212 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:04,226 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:04,247 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:04,287 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:04,426 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:04,984 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:06,300 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:06,376 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:06,390 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:06,506 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 03:16:06,507 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:06,655 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 03:16:06,658 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:06,658 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10, 8, 8] total 25 [2018-01-21 03:16:06,659 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:06,659 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 03:16:06,660 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 03:16:06,660 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=438, Unknown=0, NotChecked=0, Total=600 [2018-01-21 03:16:06,660 INFO L87 Difference]: Start difference. First operand 105 states and 114 transitions. Second operand 13 states. [2018-01-21 03:16:07,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:07,039 INFO L93 Difference]: Finished difference Result 234 states and 263 transitions. [2018-01-21 03:16:07,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 03:16:07,040 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 146 [2018-01-21 03:16:07,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:07,042 INFO L225 Difference]: With dead ends: 234 [2018-01-21 03:16:07,042 INFO L226 Difference]: Without dead ends: 222 [2018-01-21 03:16:07,043 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 566 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=602, Unknown=0, NotChecked=0, Total=812 [2018-01-21 03:16:07,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-01-21 03:16:07,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 146. [2018-01-21 03:16:07,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-01-21 03:16:07,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 163 transitions. [2018-01-21 03:16:07,055 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 163 transitions. Word has length 146 [2018-01-21 03:16:07,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:07,056 INFO L432 AbstractCegarLoop]: Abstraction has 146 states and 163 transitions. [2018-01-21 03:16:07,056 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 03:16:07,056 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 163 transitions. [2018-01-21 03:16:07,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-21 03:16:07,057 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:07,057 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 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, 1] [2018-01-21 03:16:07,057 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:07,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1755240795, now seen corresponding path program 7 times [2018-01-21 03:16:07,058 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:07,058 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:07,059 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:07,059 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:07,059 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:07,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:07,108 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:07,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 03:16:07,294 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:07,294 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:07,294 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:07,294 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:07,294 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:07,294 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 03:16:07,301 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:07,301 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:16:07,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:07,350 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:07,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 03:16:07,564 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:07,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 03:16:07,975 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:07,975 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) [2018-01-21 03:16:07,986 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:07,987 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) 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 03:16:08,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:08,096 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:08,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 03:16:08,136 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:08,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 03:16:08,396 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:08,397 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13, 13, 13] total 25 [2018-01-21 03:16:08,397 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:08,397 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 03:16:08,397 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 03:16:08,398 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2018-01-21 03:16:08,398 INFO L87 Difference]: Start difference. First operand 146 states and 163 transitions. Second operand 20 states. [2018-01-21 03:16:08,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:08,775 INFO L93 Difference]: Finished difference Result 370 states and 422 transitions. [2018-01-21 03:16:08,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 03:16:08,775 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 189 [2018-01-21 03:16:08,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:08,778 INFO L225 Difference]: With dead ends: 370 [2018-01-21 03:16:08,778 INFO L226 Difference]: Without dead ends: 296 [2018-01-21 03:16:08,779 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 774 GetRequests, 726 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=244, Invalid=1016, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 03:16:08,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2018-01-21 03:16:08,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 184. [2018-01-21 03:16:08,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-01-21 03:16:08,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 204 transitions. [2018-01-21 03:16:08,794 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 204 transitions. Word has length 189 [2018-01-21 03:16:08,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:08,795 INFO L432 AbstractCegarLoop]: Abstraction has 184 states and 204 transitions. [2018-01-21 03:16:08,795 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 03:16:08,795 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 204 transitions. [2018-01-21 03:16:08,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2018-01-21 03:16:08,798 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:08,798 INFO L322 BasicCegarLoop]: trace histogram [31, 24, 24, 24, 24, 8, 7, 7, 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, 1] [2018-01-21 03:16:08,798 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:08,798 INFO L82 PathProgramCache]: Analyzing trace with hash 519411977, now seen corresponding path program 8 times [2018-01-21 03:16:08,799 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:08,799 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:08,800 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:08,800 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:08,800 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:08,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:08,837 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:09,094 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1842 trivial. 0 not checked. [2018-01-21 03:16:09,094 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:09,094 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:09,095 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:09,095 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:09,095 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:09,095 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 03:16:09,100 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:16:09,100 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:09,114 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:09,140 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:09,148 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:09,153 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:09,262 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 03:16:09,262 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:09,487 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 03:16:09,509 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:09,509 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 03:16:09,516 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:16:09,516 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:09,541 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:09,598 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:09,651 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:09,661 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:09,704 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 03:16:09,705 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:09,845 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 03:16:09,847 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:09,847 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11, 11, 11] total 23 [2018-01-21 03:16:09,847 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:09,848 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 03:16:09,848 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 03:16:09,848 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2018-01-21 03:16:09,849 INFO L87 Difference]: Start difference. First operand 184 states and 204 transitions. Second operand 19 states. [2018-01-21 03:16:10,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:10,361 INFO L93 Difference]: Finished difference Result 330 states and 362 transitions. [2018-01-21 03:16:10,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 03:16:10,362 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 232 [2018-01-21 03:16:10,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:10,364 INFO L225 Difference]: With dead ends: 330 [2018-01-21 03:16:10,364 INFO L226 Difference]: Without dead ends: 248 [2018-01-21 03:16:10,365 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 903 SyntacticMatches, 12 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=225, Invalid=897, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 03:16:10,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-01-21 03:16:10,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 183. [2018-01-21 03:16:10,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-01-21 03:16:10,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 202 transitions. [2018-01-21 03:16:10,404 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 202 transitions. Word has length 232 [2018-01-21 03:16:10,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:10,405 INFO L432 AbstractCegarLoop]: Abstraction has 183 states and 202 transitions. [2018-01-21 03:16:10,405 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 03:16:10,405 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 202 transitions. [2018-01-21 03:16:10,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-21 03:16:10,415 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:10,415 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 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, 1] [2018-01-21 03:16:10,416 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:10,416 INFO L82 PathProgramCache]: Analyzing trace with hash -881233501, now seen corresponding path program 9 times [2018-01-21 03:16:10,416 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:10,417 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:10,418 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:10,418 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:10,418 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:10,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:10,459 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:10,685 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 03:16:10,686 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:10,686 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:10,686 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:10,686 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:10,686 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:10,687 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 03:16:10,692 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:16:10,692 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:16:10,713 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:10,718 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:10,722 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:10,728 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:10,736 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:10,746 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:10,754 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:10,756 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:10,761 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:10,875 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 03:16:10,875 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:11,169 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 03:16:11,190 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:11,190 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 03:16:11,193 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:16:11,193 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:16:11,218 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:11,227 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:11,241 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:11,262 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:11,299 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:11,371 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:11,732 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:11,762 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:11,773 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:11,833 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 03:16:11,833 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:12,270 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 03:16:12,272 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:12,273 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 27 [2018-01-21 03:16:12,273 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:12,273 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 03:16:12,274 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 03:16:12,274 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2018-01-21 03:16:12,274 INFO L87 Difference]: Start difference. First operand 183 states and 202 transitions. Second operand 18 states. [2018-01-21 03:16:12,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:12,542 INFO L93 Difference]: Finished difference Result 420 states and 476 transitions. [2018-01-21 03:16:12,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 03:16:12,542 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 275 [2018-01-21 03:16:12,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:12,546 INFO L225 Difference]: With dead ends: 420 [2018-01-21 03:16:12,546 INFO L226 Difference]: Without dead ends: 408 [2018-01-21 03:16:12,547 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1115 GetRequests, 1082 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=281, Invalid=775, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 03:16:12,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2018-01-21 03:16:12,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 234. [2018-01-21 03:16:12,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-01-21 03:16:12,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 264 transitions. [2018-01-21 03:16:12,566 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 264 transitions. Word has length 275 [2018-01-21 03:16:12,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:12,567 INFO L432 AbstractCegarLoop]: Abstraction has 234 states and 264 transitions. [2018-01-21 03:16:12,567 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 03:16:12,567 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 264 transitions. [2018-01-21 03:16:12,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-21 03:16:12,569 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:12,569 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 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, 1] [2018-01-21 03:16:12,569 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:12,569 INFO L82 PathProgramCache]: Analyzing trace with hash 2119777693, now seen corresponding path program 10 times [2018-01-21 03:16:12,569 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:12,570 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:12,570 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:12,570 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:12,570 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:12,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:12,600 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:12,942 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 03:16:12,943 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:12,943 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:12,943 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:12,943 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:12,943 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:12,943 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 03:16:12,951 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:16:12,952 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:16:13,041 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:13,049 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:13,253 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 03:16:13,253 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:13,757 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 03:16:13,798 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:13,798 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 03:16:13,804 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:16:13,804 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:16:13,945 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:13,958 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:14,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 03:16:14,055 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:14,311 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 03:16:14,313 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:14,313 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 17, 17, 17] total 34 [2018-01-21 03:16:14,313 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:14,314 INFO L409 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-01-21 03:16:14,314 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-01-21 03:16:14,314 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=913, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 03:16:14,314 INFO L87 Difference]: Start difference. First operand 234 states and 264 transitions. Second operand 27 states. [2018-01-21 03:16:15,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:15,044 INFO L93 Difference]: Finished difference Result 592 states and 676 transitions. [2018-01-21 03:16:15,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 03:16:15,044 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 333 [2018-01-21 03:16:15,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:15,047 INFO L225 Difference]: With dead ends: 592 [2018-01-21 03:16:15,048 INFO L226 Difference]: Without dead ends: 495 [2018-01-21 03:16:15,049 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1358 GetRequests, 1292 SyntacticMatches, 18 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 812 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=445, Invalid=2005, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 03:16:15,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2018-01-21 03:16:15,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 282. [2018-01-21 03:16:15,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-01-21 03:16:15,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 316 transitions. [2018-01-21 03:16:15,074 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 316 transitions. Word has length 333 [2018-01-21 03:16:15,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:15,075 INFO L432 AbstractCegarLoop]: Abstraction has 282 states and 316 transitions. [2018-01-21 03:16:15,075 INFO L433 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-01-21 03:16:15,075 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 316 transitions. [2018-01-21 03:16:15,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 392 [2018-01-21 03:16:15,078 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:15,079 INFO L322 BasicCegarLoop]: trace histogram [58, 48, 48, 48, 48, 11, 10, 10, 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, 1] [2018-01-21 03:16:15,079 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:15,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1106394585, now seen corresponding path program 11 times [2018-01-21 03:16:15,079 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:15,080 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:15,080 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:15,080 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:15,080 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:15,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:15,172 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:15,602 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 6870 trivial. 0 not checked. [2018-01-21 03:16:15,603 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:15,603 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:15,603 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:15,603 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:15,603 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:15,603 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 03:16:15,610 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:16:15,611 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:15,645 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:15,661 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:15,675 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:15,698 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:15,715 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:15,729 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:15,747 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:15,749 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:15,756 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:16,171 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 03:16:16,171 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:16,743 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 03:16:16,776 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:16,776 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 03:16:16,780 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:16:16,780 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:16,813 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:16,823 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:16,844 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:16,884 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:16,936 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:17,564 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:17,745 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:17,783 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:17,795 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:17,896 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 03:16:17,896 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:18,172 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 03:16:18,174 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:18,174 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 17, 17, 17] total 36 [2018-01-21 03:16:18,174 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:18,175 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 03:16:18,175 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 03:16:18,176 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1062, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 03:16:18,176 INFO L87 Difference]: Start difference. First operand 282 states and 316 transitions. Second operand 28 states. [2018-01-21 03:16:18,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:18,908 INFO L93 Difference]: Finished difference Result 640 states and 719 transitions. [2018-01-21 03:16:18,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 03:16:18,908 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 391 [2018-01-21 03:16:18,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:18,910 INFO L225 Difference]: With dead ends: 640 [2018-01-21 03:16:18,911 INFO L226 Difference]: Without dead ends: 345 [2018-01-21 03:16:18,913 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1601 GetRequests, 1523 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=623, Invalid=3159, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 03:16:18,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-01-21 03:16:18,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 281. [2018-01-21 03:16:18,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2018-01-21 03:16:18,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 307 transitions. [2018-01-21 03:16:18,930 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 307 transitions. Word has length 391 [2018-01-21 03:16:18,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:18,930 INFO L432 AbstractCegarLoop]: Abstraction has 281 states and 307 transitions. [2018-01-21 03:16:18,930 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 03:16:18,930 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 307 transitions. [2018-01-21 03:16:18,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2018-01-21 03:16:18,932 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:18,932 INFO L322 BasicCegarLoop]: trace histogram [67, 56, 56, 56, 56, 12, 11, 11, 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, 1] [2018-01-21 03:16:18,932 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:18,933 INFO L82 PathProgramCache]: Analyzing trace with hash -785380599, now seen corresponding path program 12 times [2018-01-21 03:16:18,933 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:18,933 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:18,933 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:18,933 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:18,934 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:18,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:18,967 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:19,377 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 9262 trivial. 0 not checked. [2018-01-21 03:16:19,377 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:19,377 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:19,377 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:19,377 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:19,377 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:19,378 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 03:16:19,390 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:16:19,391 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:16:19,419 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,435 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,451 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,459 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,467 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,479 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,495 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,513 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,523 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,540 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,572 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,587 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,618 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,637 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,693 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,735 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,792 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:19,795 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:19,801 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:20,230 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 03:16:20,230 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:20,727 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 03:16:20,748 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:20,748 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 03:16:20,752 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:16:20,752 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:16:20,795 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:20,805 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:20,828 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:20,864 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:20,938 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:29,566 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:31,186 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:38,803 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:50,904 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