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.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/memset2_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:54:08,476 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:54:08,478 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:54:08,490 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:54:08,490 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:54:08,491 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:54:08,492 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:54:08,493 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:54:08,494 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:54:08,495 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:54:08,495 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:54:08,496 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:54:08,496 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:54:08,497 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:54:08,498 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:54:08,501 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:54:08,503 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:54:08,505 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:54:08,506 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:54:08,507 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:54:08,509 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-20 23:54:08,514 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:54:08,515 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:54:08,515 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.epf [2018-01-20 23:54:08,525 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:54:08,525 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:54:08,526 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:54:08,526 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:54:08,526 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:54:08,526 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:54:08,527 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:54:08,527 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:54:08,527 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:54:08,528 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:54:08,528 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:54:08,528 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:54:08,528 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:54:08,528 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:54:08,529 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:54:08,529 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:54:08,529 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:54:08,529 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:54:08,529 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:54:08,530 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:54:08,530 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:54:08,530 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:54:08,530 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:54:08,530 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:54:08,531 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:54:08,531 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:54:08,531 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:54:08,531 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:54:08,531 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:54:08,532 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:54:08,532 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:54:08,532 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:54:08,532 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:54:08,532 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:54:08,533 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:54:08,533 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:54:08,534 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:54:08,534 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:54:08,568 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:54:08,581 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:54:08,585 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:54:08,587 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:54:08,587 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:54:08,588 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/memset2_true-valid-memsafety_true-termination.c [2018-01-20 23:54:08,714 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:54:08,718 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:54:08,719 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:54:08,719 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:54:08,724 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:54:08,725 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:54:08" (1/1) ... [2018-01-20 23:54:08,727 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8d55d51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08, skipping insertion in model container [2018-01-20 23:54:08,727 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:54:08" (1/1) ... [2018-01-20 23:54:08,739 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:54:08,753 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:54:08,860 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:54:08,873 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:54:08,878 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08 WrapperNode [2018-01-20 23:54:08,878 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:54:08,879 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:54:08,879 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:54:08,879 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:54:08,897 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08" (1/1) ... [2018-01-20 23:54:08,897 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08" (1/1) ... [2018-01-20 23:54:08,909 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08" (1/1) ... [2018-01-20 23:54:08,909 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08" (1/1) ... [2018-01-20 23:54:08,912 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08" (1/1) ... [2018-01-20 23:54:08,916 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08" (1/1) ... [2018-01-20 23:54:08,917 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08" (1/1) ... [2018-01-20 23:54:08,919 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:54:08,919 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:54:08,919 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:54:08,920 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:54:08,921 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08" (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 [2018-01-20 23:54:08,971 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:54:08,971 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:54:08,971 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:54:08,972 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:54:08,972 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:54:08,972 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:54:08,972 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2018-01-20 23:54:08,972 INFO L136 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2018-01-20 23:54:08,972 INFO L128 BoogieDeclarations]: Found specification of procedure memset [2018-01-20 23:54:08,973 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:54:08,973 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:54:08,973 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:54:09,096 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:54:09,097 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:54:09 BoogieIcfgContainer [2018-01-20 23:54:09,097 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:54:09,098 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:54:09,098 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:54:09,099 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:54:09,100 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:54:08" (1/3) ... [2018-01-20 23:54:09,100 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@87a776 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:54:09, skipping insertion in model container [2018-01-20 23:54:09,101 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:54:08" (2/3) ... [2018-01-20 23:54:09,101 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@87a776 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:54:09, skipping insertion in model container [2018-01-20 23:54:09,101 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:54:09" (3/3) ... [2018-01-20 23:54:09,102 INFO L105 eAbstractionObserver]: Analyzing ICFG memset2_true-valid-memsafety_true-termination.c [2018-01-20 23:54:09,108 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:54:09,113 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-20 23:54:09,143 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:54:09,143 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:54:09,143 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:54:09,143 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:54:09,144 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:54:09,144 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:54:09,144 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:54:09,144 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:54:09,144 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:54:09,158 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-01-20 23:54:09,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:54:09,162 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:09,163 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:54:09,163 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:54:09,167 INFO L82 PathProgramCache]: Analyzing trace with hash 50935, now seen corresponding path program 1 times [2018-01-20 23:54:09,170 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:09,238 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:09,239 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:09,239 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:09,239 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:09,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:54:09,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:54:09,294 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:54:09,301 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:54:09,306 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:54:09,306 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:54:09,306 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:54:09,306 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:54:09,306 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:54:09,306 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:54:09,306 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:54:09,306 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:54:09,306 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:54:09,307 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-01-20 23:54:09,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-20 23:54:09,308 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:09,308 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:09,308 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:09,308 INFO L82 PathProgramCache]: Analyzing trace with hash 457189328, now seen corresponding path program 1 times [2018-01-20 23:54:09,308 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:09,309 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:09,309 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:09,309 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:09,310 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:09,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:09,334 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:09,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:09,409 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:54:09,409 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-20 23:54:09,409 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:54:09,410 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-20 23:54:09,420 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-20 23:54:09,420 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-20 23:54:09,422 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 4 states. [2018-01-20 23:54:09,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:09,458 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-01-20 23:54:09,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:54:09,459 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2018-01-20 23:54:09,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:09,467 INFO L225 Difference]: With dead ends: 33 [2018-01-20 23:54:09,467 INFO L226 Difference]: Without dead ends: 19 [2018-01-20 23:54:09,469 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-20 23:54:09,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-01-20 23:54:09,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-01-20 23:54:09,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-01-20 23:54:09,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-01-20 23:54:09,565 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-01-20 23:54:09,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:09,566 INFO L432 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-01-20 23:54:09,566 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-20 23:54:09,566 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-01-20 23:54:09,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-20 23:54:09,567 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:09,567 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:09,567 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:09,567 INFO L82 PathProgramCache]: Analyzing trace with hash -114007861, now seen corresponding path program 1 times [2018-01-20 23:54:09,568 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:09,568 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:09,569 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:09,569 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:09,569 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:09,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:09,583 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:09,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:09,661 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:09,661 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:09,662 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-01-20 23:54:09,664 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [9], [10], [14], [15], [17], [18], [19], [20], [22], [23], [24], [25], [26], [27] [2018-01-20 23:54:09,706 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:54:09,706 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:54:09,969 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:54:09,970 INFO L268 AbstractInterpreter]: Visited 18 different actions 22 times. Merged at 3 different actions 3 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 15 variables. [2018-01-20 23:54:09,985 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:54:09,985 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:09,986 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-01-20 23:54:09,992 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:09,992 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:10,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:10,017 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:10,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:10,065 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:10,190 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:10,212 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:10,213 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 [2018-01-20 23:54:10,217 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:10,217 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:10,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:10,243 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:10,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:10,249 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:10,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:10,340 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:10,340 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 11 [2018-01-20 23:54:10,341 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:10,342 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-20 23:54:10,342 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-20 23:54:10,343 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:54:10,343 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 8 states. [2018-01-20 23:54:10,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:10,378 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-01-20 23:54:10,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:54:10,379 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2018-01-20 23:54:10,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:10,380 INFO L225 Difference]: With dead ends: 29 [2018-01-20 23:54:10,380 INFO L226 Difference]: Without dead ends: 20 [2018-01-20 23:54:10,381 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2018-01-20 23:54:10,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-01-20 23:54:10,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-01-20 23:54:10,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-01-20 23:54:10,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-01-20 23:54:10,386 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-01-20 23:54:10,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:10,386 INFO L432 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-01-20 23:54:10,386 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-20 23:54:10,386 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-01-20 23:54:10,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:54:10,387 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:10,387 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:10,387 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:10,387 INFO L82 PathProgramCache]: Analyzing trace with hash -641251536, now seen corresponding path program 2 times [2018-01-20 23:54:10,388 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:10,388 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:10,389 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:10,389 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:10,389 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:10,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:10,404 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:10,532 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:10,533 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:10,533 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:10,533 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:10,533 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:10,533 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:10,534 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 [2018-01-20 23:54:10,543 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:10,543 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:10,555 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:10,568 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:10,573 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:10,575 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:10,611 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:10,611 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:10,789 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:10,813 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:10,814 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:10,818 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:10,818 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:10,833 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:10,841 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:10,847 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:10,851 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:10,856 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:10,856 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:10,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:10,948 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:10,948 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 14 [2018-01-20 23:54:10,948 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:10,949 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:54:10,949 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:54:10,949 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=113, Unknown=0, NotChecked=0, Total=182 [2018-01-20 23:54:10,949 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 10 states. [2018-01-20 23:54:10,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:10,977 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-01-20 23:54:10,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-20 23:54:10,977 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 19 [2018-01-20 23:54:10,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:10,978 INFO L225 Difference]: With dead ends: 30 [2018-01-20 23:54:10,978 INFO L226 Difference]: Without dead ends: 21 [2018-01-20 23:54:10,978 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2018-01-20 23:54:10,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-01-20 23:54:10,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-01-20 23:54:10,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-01-20 23:54:10,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-01-20 23:54:10,981 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-01-20 23:54:10,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:10,981 INFO L432 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-01-20 23:54:10,981 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:54:10,982 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-01-20 23:54:10,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-20 23:54:10,982 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:10,982 INFO L322 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:10,982 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:10,982 INFO L82 PathProgramCache]: Analyzing trace with hash 194063723, now seen corresponding path program 3 times [2018-01-20 23:54:10,983 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:10,983 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:10,983 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:10,983 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:10,984 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:10,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:10,994 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:11,047 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,047 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:11,047 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:11,047 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:11,047 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:11,047 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:11,048 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:11,053 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:11,053 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:11,060 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:11,062 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:11,063 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:11,063 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:11,065 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:11,100 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,100 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:11,226 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,245 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:11,246 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:11,249 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:11,249 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:11,262 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:11,269 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:11,277 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:11,283 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:11,286 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:11,290 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,290 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:11,327 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,328 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:11,328 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 17 [2018-01-20 23:54:11,328 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:11,329 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-20 23:54:11,329 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-20 23:54:11,329 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:54:11,329 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 12 states. [2018-01-20 23:54:11,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:11,348 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-01-20 23:54:11,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-20 23:54:11,349 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2018-01-20 23:54:11,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:11,350 INFO L225 Difference]: With dead ends: 31 [2018-01-20 23:54:11,350 INFO L226 Difference]: Without dead ends: 22 [2018-01-20 23:54:11,350 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=191, Unknown=0, NotChecked=0, Total=306 [2018-01-20 23:54:11,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-01-20 23:54:11,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-01-20 23:54:11,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-01-20 23:54:11,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-01-20 23:54:11,355 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-01-20 23:54:11,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:11,355 INFO L432 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-01-20 23:54:11,356 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-20 23:54:11,356 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-01-20 23:54:11,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-20 23:54:11,356 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:11,357 INFO L322 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:11,357 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:11,357 INFO L82 PathProgramCache]: Analyzing trace with hash 319032976, now seen corresponding path program 4 times [2018-01-20 23:54:11,357 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:11,359 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:11,359 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:11,359 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:11,359 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:11,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:11,372 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:11,439 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,439 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:11,440 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:11,440 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:11,440 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:11,440 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:11,440 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:11,446 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:11,446 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:11,455 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:11,457 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:11,487 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,487 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:11,608 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,628 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:11,628 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:11,631 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:11,632 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:11,652 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:11,655 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:11,659 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,660 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:11,735 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,737 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:11,737 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-20 23:54:11,737 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:11,738 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-20 23:54:11,738 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-20 23:54:11,738 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=239, Unknown=0, NotChecked=0, Total=380 [2018-01-20 23:54:11,739 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2018-01-20 23:54:11,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:11,780 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-01-20 23:54:11,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-20 23:54:11,780 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2018-01-20 23:54:11,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:11,781 INFO L225 Difference]: With dead ends: 32 [2018-01-20 23:54:11,781 INFO L226 Difference]: Without dead ends: 23 [2018-01-20 23:54:11,782 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=156, Invalid=264, Unknown=0, NotChecked=0, Total=420 [2018-01-20 23:54:11,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-01-20 23:54:11,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-01-20 23:54:11,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-01-20 23:54:11,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-01-20 23:54:11,785 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-01-20 23:54:11,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:11,785 INFO L432 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-01-20 23:54:11,786 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-20 23:54:11,786 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-01-20 23:54:11,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-20 23:54:11,787 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:11,787 INFO L322 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:11,787 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:11,787 INFO L82 PathProgramCache]: Analyzing trace with hash -101887477, now seen corresponding path program 5 times [2018-01-20 23:54:11,787 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:11,788 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:11,788 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:11,788 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:11,789 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:11,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:11,802 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:11,883 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,884 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:11,884 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:11,884 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:11,884 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:11,884 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:11,884 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:11,889 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:11,889 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:11,893 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:11,894 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:11,895 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:11,904 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:11,905 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:11,906 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:11,942 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:11,942 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:12,141 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,162 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:12,162 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:12,165 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:12,166 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:12,170 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:12,171 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:12,175 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:12,185 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:12,192 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:12,195 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:12,199 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,200 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:12,257 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,259 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:12,259 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-20 23:54:12,259 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:12,259 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-20 23:54:12,259 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-20 23:54:12,260 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=320, Unknown=0, NotChecked=0, Total=506 [2018-01-20 23:54:12,260 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 16 states. [2018-01-20 23:54:12,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:12,286 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-01-20 23:54:12,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-20 23:54:12,287 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 22 [2018-01-20 23:54:12,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:12,288 INFO L225 Difference]: With dead ends: 33 [2018-01-20 23:54:12,288 INFO L226 Difference]: Without dead ends: 24 [2018-01-20 23:54:12,288 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2018-01-20 23:54:12,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-01-20 23:54:12,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-01-20 23:54:12,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-01-20 23:54:12,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-01-20 23:54:12,292 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-01-20 23:54:12,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:12,292 INFO L432 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-01-20 23:54:12,292 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-20 23:54:12,293 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-01-20 23:54:12,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-01-20 23:54:12,293 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:12,293 INFO L322 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:12,294 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:12,294 INFO L82 PathProgramCache]: Analyzing trace with hash -265519632, now seen corresponding path program 6 times [2018-01-20 23:54:12,294 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:12,295 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:12,295 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:12,295 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:12,295 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:12,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:12,306 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:12,377 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,378 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:12,378 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:12,378 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:12,378 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:12,378 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:12,378 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:12,383 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:12,383 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:12,390 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:12,391 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:12,392 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:12,394 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:12,394 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:12,395 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:12,437 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,438 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:12,597 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,618 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:12,618 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:12,622 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:12,622 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:12,634 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:12,644 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:12,656 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:12,668 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:12,674 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:12,678 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:12,685 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,685 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:12,799 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:12,801 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:12,801 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 26 [2018-01-20 23:54:12,801 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:12,802 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-20 23:54:12,802 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-20 23:54:12,802 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=413, Unknown=0, NotChecked=0, Total=650 [2018-01-20 23:54:12,803 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 18 states. [2018-01-20 23:54:12,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:12,873 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-20 23:54:12,873 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-20 23:54:12,873 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 23 [2018-01-20 23:54:12,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:12,874 INFO L225 Difference]: With dead ends: 34 [2018-01-20 23:54:12,874 INFO L226 Difference]: Without dead ends: 25 [2018-01-20 23:54:12,875 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=256, Invalid=446, Unknown=0, NotChecked=0, Total=702 [2018-01-20 23:54:12,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-01-20 23:54:12,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-01-20 23:54:12,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-01-20 23:54:12,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-01-20 23:54:12,880 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-01-20 23:54:12,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:12,880 INFO L432 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-01-20 23:54:12,880 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-20 23:54:12,880 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-01-20 23:54:12,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-20 23:54:12,881 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:12,881 INFO L322 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:12,882 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:12,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1043149141, now seen corresponding path program 7 times [2018-01-20 23:54:12,882 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:12,883 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:12,883 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:12,883 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:12,883 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:12,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:12,896 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:13,038 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,039 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,039 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:13,039 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:13,039 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:13,039 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,039 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:13,045 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:13,045 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:13,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:13,055 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:13,104 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,104 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:13,279 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,300 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,300 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:13,303 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:13,303 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:13,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:13,322 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:13,327 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,327 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:13,381 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,382 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:13,382 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-20 23:54:13,382 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:13,383 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-20 23:54:13,383 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-20 23:54:13,383 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=518, Unknown=0, NotChecked=0, Total=812 [2018-01-20 23:54:13,383 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 20 states. [2018-01-20 23:54:13,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:13,418 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-01-20 23:54:13,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-20 23:54:13,418 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 24 [2018-01-20 23:54:13,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:13,419 INFO L225 Difference]: With dead ends: 35 [2018-01-20 23:54:13,419 INFO L226 Difference]: Without dead ends: 26 [2018-01-20 23:54:13,419 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=315, Invalid=555, Unknown=0, NotChecked=0, Total=870 [2018-01-20 23:54:13,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-01-20 23:54:13,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-01-20 23:54:13,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-01-20 23:54:13,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-01-20 23:54:13,422 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-01-20 23:54:13,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:13,422 INFO L432 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-01-20 23:54:13,423 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-20 23:54:13,423 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-01-20 23:54:13,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-20 23:54:13,423 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:13,423 INFO L322 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:13,423 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:13,423 INFO L82 PathProgramCache]: Analyzing trace with hash 620139856, now seen corresponding path program 8 times [2018-01-20 23:54:13,424 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:13,424 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:13,424 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:13,424 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:13,424 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:13,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:13,435 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:13,530 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,530 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,530 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:13,530 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:13,531 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:13,531 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,531 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:13,535 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:13,536 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:13,542 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:13,545 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:13,546 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:13,547 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:13,599 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,599 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:13,807 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,827 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:13,828 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:13,831 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:13,831 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:13,840 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:13,848 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:13,855 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:13,858 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:13,862 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,862 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:13,946 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:13,948 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:13,948 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-20 23:54:13,948 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:13,948 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-20 23:54:13,948 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-20 23:54:13,949 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=635, Unknown=0, NotChecked=0, Total=992 [2018-01-20 23:54:13,949 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 22 states. [2018-01-20 23:54:13,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:13,976 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-01-20 23:54:13,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-20 23:54:13,977 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 25 [2018-01-20 23:54:13,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:13,977 INFO L225 Difference]: With dead ends: 36 [2018-01-20 23:54:13,977 INFO L226 Difference]: Without dead ends: 27 [2018-01-20 23:54:13,978 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=380, Invalid=676, Unknown=0, NotChecked=0, Total=1056 [2018-01-20 23:54:13,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-01-20 23:54:13,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-01-20 23:54:13,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-01-20 23:54:13,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-01-20 23:54:13,980 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-01-20 23:54:13,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:13,981 INFO L432 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-01-20 23:54:13,981 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-20 23:54:13,981 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-01-20 23:54:13,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-20 23:54:13,981 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:13,981 INFO L322 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:13,981 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:13,981 INFO L82 PathProgramCache]: Analyzing trace with hash 642491211, now seen corresponding path program 9 times [2018-01-20 23:54:13,982 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:13,982 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:13,982 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:13,982 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:13,982 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:13,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:13,991 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:14,130 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,131 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,131 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:14,131 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:14,131 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:14,131 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,131 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:14,140 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:14,140 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:14,146 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,148 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,149 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,150 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,152 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,153 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,153 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:14,154 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:14,258 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,258 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:14,477 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,498 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,498 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:14,501 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:14,501 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:14,510 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,516 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,524 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,533 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,541 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,550 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:14,557 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:14,560 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:14,564 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,564 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:14,639 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,640 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:14,640 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 35 [2018-01-20 23:54:14,640 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:14,640 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-20 23:54:14,641 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-20 23:54:14,641 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=764, Unknown=0, NotChecked=0, Total=1190 [2018-01-20 23:54:14,641 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 24 states. [2018-01-20 23:54:14,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:14,673 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-01-20 23:54:14,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-20 23:54:14,673 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2018-01-20 23:54:14,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:14,674 INFO L225 Difference]: With dead ends: 37 [2018-01-20 23:54:14,674 INFO L226 Difference]: Without dead ends: 28 [2018-01-20 23:54:14,675 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=451, Invalid=809, Unknown=0, NotChecked=0, Total=1260 [2018-01-20 23:54:14,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-01-20 23:54:14,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-01-20 23:54:14,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-01-20 23:54:14,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-01-20 23:54:14,678 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-01-20 23:54:14,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:14,679 INFO L432 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-01-20 23:54:14,679 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-20 23:54:14,679 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-01-20 23:54:14,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-20 23:54:14,680 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:14,680 INFO L322 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:14,680 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:14,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1335383216, now seen corresponding path program 10 times [2018-01-20 23:54:14,680 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:14,681 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:14,681 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:14,681 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:14,681 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:14,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:14,691 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:14,823 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,823 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,824 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:14,824 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:14,824 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:14,824 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:14,824 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:14,832 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:14,832 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:14,855 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:14,857 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:14,973 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:14,974 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:15,221 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,241 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:15,241 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:15,244 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:15,244 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:15,268 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:15,271 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:15,276 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,276 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:15,356 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,358 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:15,358 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-20 23:54:15,358 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:15,358 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-20 23:54:15,359 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-20 23:54:15,359 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=905, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:54:15,359 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 26 states. [2018-01-20 23:54:15,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:15,388 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-01-20 23:54:15,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-20 23:54:15,388 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 27 [2018-01-20 23:54:15,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:15,389 INFO L225 Difference]: With dead ends: 38 [2018-01-20 23:54:15,389 INFO L226 Difference]: Without dead ends: 29 [2018-01-20 23:54:15,390 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=528, Invalid=954, Unknown=0, NotChecked=0, Total=1482 [2018-01-20 23:54:15,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-01-20 23:54:15,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-01-20 23:54:15,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-01-20 23:54:15,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-01-20 23:54:15,394 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-01-20 23:54:15,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:15,394 INFO L432 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-01-20 23:54:15,394 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-20 23:54:15,394 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-01-20 23:54:15,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-20 23:54:15,395 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:15,395 INFO L322 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:15,395 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:15,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1340198891, now seen corresponding path program 11 times [2018-01-20 23:54:15,396 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:15,396 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:15,397 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:15,397 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:15,397 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:15,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:15,407 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:15,511 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,511 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:15,511 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:15,511 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:15,511 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:15,511 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:15,512 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:15,516 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:15,517 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:15,520 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,521 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,522 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,524 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,525 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,526 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,530 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,531 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:15,532 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:15,608 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,608 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:15,879 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,899 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:15,899 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:15,902 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:15,902 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:15,907 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,908 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,912 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,915 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,919 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,924 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,934 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:15,942 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:15,945 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:15,951 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:15,951 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:16,062 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,064 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:16,064 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-20 23:54:16,064 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:16,064 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-20 23:54:16,065 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-20 23:54:16,065 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=1058, Unknown=0, NotChecked=0, Total=1640 [2018-01-20 23:54:16,065 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-01-20 23:54:16,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:16,104 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-01-20 23:54:16,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-20 23:54:16,105 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-01-20 23:54:16,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:16,105 INFO L225 Difference]: With dead ends: 39 [2018-01-20 23:54:16,105 INFO L226 Difference]: Without dead ends: 30 [2018-01-20 23:54:16,106 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=611, Invalid=1111, Unknown=0, NotChecked=0, Total=1722 [2018-01-20 23:54:16,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-01-20 23:54:16,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-01-20 23:54:16,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-01-20 23:54:16,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-01-20 23:54:16,109 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-01-20 23:54:16,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:16,109 INFO L432 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-01-20 23:54:16,109 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-20 23:54:16,110 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-01-20 23:54:16,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-20 23:54:16,110 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:16,110 INFO L322 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:16,111 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:16,111 INFO L82 PathProgramCache]: Analyzing trace with hash 1489484816, now seen corresponding path program 12 times [2018-01-20 23:54:16,111 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:16,112 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:16,112 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:16,112 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:16,112 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:16,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:16,121 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:16,304 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,304 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:16,304 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:16,304 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:16,304 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:16,304 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:16,304 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:16,313 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:16,313 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:16,320 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,324 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,325 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,326 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,327 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,328 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,329 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,330 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:16,332 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:16,452 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,452 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:16,851 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,871 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:16,871 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:16,878 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:16,878 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:16,889 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,896 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,904 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,912 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,921 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,931 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,940 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:16,948 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:16,951 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:16,955 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:16,956 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:17,105 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,106 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:17,106 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 44 [2018-01-20 23:54:17,107 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:17,107 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-20 23:54:17,107 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-20 23:54:17,108 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=1223, Unknown=0, NotChecked=0, Total=1892 [2018-01-20 23:54:17,108 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 30 states. [2018-01-20 23:54:17,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:17,155 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-01-20 23:54:17,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-01-20 23:54:17,155 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 29 [2018-01-20 23:54:17,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:17,156 INFO L225 Difference]: With dead ends: 40 [2018-01-20 23:54:17,156 INFO L226 Difference]: Without dead ends: 31 [2018-01-20 23:54:17,157 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=700, Invalid=1280, Unknown=0, NotChecked=0, Total=1980 [2018-01-20 23:54:17,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-01-20 23:54:17,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-01-20 23:54:17,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-01-20 23:54:17,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-01-20 23:54:17,159 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-01-20 23:54:17,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:17,159 INFO L432 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-01-20 23:54:17,159 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-20 23:54:17,160 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-01-20 23:54:17,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-20 23:54:17,160 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:17,160 INFO L322 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:17,160 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:17,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1822381195, now seen corresponding path program 13 times [2018-01-20 23:54:17,160 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:17,161 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:17,161 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:17,161 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:17,161 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:17,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:17,170 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:17,348 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,348 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:17,348 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:17,349 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:17,349 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:17,349 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:17,349 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:17,357 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:17,357 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:17,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:17,369 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:17,467 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,467 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:17,930 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,950 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:17,951 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:17,955 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:17,955 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:17,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:17,981 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:17,987 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:17,987 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:18,091 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,092 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:18,093 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-20 23:54:18,093 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:18,093 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-20 23:54:18,093 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-20 23:54:18,094 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=1400, Unknown=0, NotChecked=0, Total=2162 [2018-01-20 23:54:18,094 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 32 states. [2018-01-20 23:54:18,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:18,134 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-01-20 23:54:18,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-20 23:54:18,134 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 30 [2018-01-20 23:54:18,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:18,135 INFO L225 Difference]: With dead ends: 41 [2018-01-20 23:54:18,135 INFO L226 Difference]: Without dead ends: 32 [2018-01-20 23:54:18,136 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=795, Invalid=1461, Unknown=0, NotChecked=0, Total=2256 [2018-01-20 23:54:18,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-01-20 23:54:18,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-01-20 23:54:18,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-01-20 23:54:18,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-01-20 23:54:18,138 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-01-20 23:54:18,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:18,138 INFO L432 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-01-20 23:54:18,138 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-20 23:54:18,138 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-01-20 23:54:18,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-20 23:54:18,139 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:18,139 INFO L322 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:18,139 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:18,139 INFO L82 PathProgramCache]: Analyzing trace with hash -742732944, now seen corresponding path program 14 times [2018-01-20 23:54:18,139 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:18,140 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:18,140 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:18,140 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:18,140 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:18,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:18,149 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:18,363 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,363 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:18,363 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:18,363 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:18,363 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:18,363 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:18,364 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:18,370 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:18,371 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:18,380 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,386 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:18,387 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:18,389 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:18,712 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:18,712 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:19,118 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,138 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:19,138 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:19,141 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:19,142 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:19,152 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:19,163 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:19,171 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:19,175 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:19,186 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,186 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:19,291 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,292 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:19,293 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-20 23:54:19,293 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:19,293 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-20 23:54:19,293 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-20 23:54:19,294 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=1589, Unknown=0, NotChecked=0, Total=2450 [2018-01-20 23:54:19,294 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 34 states. [2018-01-20 23:54:19,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:19,383 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-01-20 23:54:19,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-20 23:54:19,383 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 31 [2018-01-20 23:54:19,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:19,384 INFO L225 Difference]: With dead ends: 42 [2018-01-20 23:54:19,384 INFO L226 Difference]: Without dead ends: 33 [2018-01-20 23:54:19,385 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=896, Invalid=1654, Unknown=0, NotChecked=0, Total=2550 [2018-01-20 23:54:19,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-01-20 23:54:19,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-01-20 23:54:19,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-01-20 23:54:19,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-01-20 23:54:19,389 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-01-20 23:54:19,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:19,389 INFO L432 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-01-20 23:54:19,389 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-20 23:54:19,389 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-01-20 23:54:19,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-20 23:54:19,390 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:19,390 INFO L322 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:19,390 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:19,390 INFO L82 PathProgramCache]: Analyzing trace with hash 1343107371, now seen corresponding path program 15 times [2018-01-20 23:54:19,390 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:19,391 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:19,391 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:19,391 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:19,391 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:19,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:19,400 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:19,659 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,659 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:19,659 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:19,659 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:19,659 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:19,659 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:19,659 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:19,670 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:19,670 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:19,677 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:19,687 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:19,688 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:19,689 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:19,691 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:19,694 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:19,696 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:19,697 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:19,698 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:19,698 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:19,700 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:19,847 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:19,847 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:20,385 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:20,407 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:20,407 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:20,416 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:20,416 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:20,427 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:20,437 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:20,449 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:20,460 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:20,469 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:20,478 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:20,488 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:20,498 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:20,508 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:20,516 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:20,519 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:20,524 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:20,524 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:20,710 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:20,711 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:20,711 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 53 [2018-01-20 23:54:20,712 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:20,712 INFO L409 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-01-20 23:54:20,712 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-01-20 23:54:20,713 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=966, Invalid=1790, Unknown=0, NotChecked=0, Total=2756 [2018-01-20 23:54:20,713 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 36 states. [2018-01-20 23:54:20,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:20,757 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-01-20 23:54:20,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-01-20 23:54:20,758 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 32 [2018-01-20 23:54:20,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:20,758 INFO L225 Difference]: With dead ends: 43 [2018-01-20 23:54:20,758 INFO L226 Difference]: Without dead ends: 34 [2018-01-20 23:54:20,759 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1123 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1003, Invalid=1859, Unknown=0, NotChecked=0, Total=2862 [2018-01-20 23:54:20,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-01-20 23:54:20,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-01-20 23:54:20,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-01-20 23:54:20,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-01-20 23:54:20,762 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-01-20 23:54:20,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:20,762 INFO L432 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-01-20 23:54:20,762 INFO L433 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-01-20 23:54:20,762 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-01-20 23:54:20,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-20 23:54:20,762 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:20,762 INFO L322 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:20,763 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:20,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1579647696, now seen corresponding path program 16 times [2018-01-20 23:54:20,763 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:20,763 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:20,763 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:20,763 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:20,764 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:20,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:20,772 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:20,973 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:20,973 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:20,973 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:20,973 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:20,973 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:20,973 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:20,973 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:20,978 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:20,978 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:20,990 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:20,991 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:21,113 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:21,113 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:21,573 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:21,593 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:21,593 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:21,596 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:21,596 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:21,626 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:21,629 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:21,634 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:21,634 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:21,760 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:21,761 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:21,762 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 56 [2018-01-20 23:54:21,762 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:21,762 INFO L409 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-01-20 23:54:21,762 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-01-20 23:54:21,763 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1077, Invalid=2003, Unknown=0, NotChecked=0, Total=3080 [2018-01-20 23:54:21,763 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 38 states. [2018-01-20 23:54:21,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:21,844 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-01-20 23:54:21,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-20 23:54:21,844 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 33 [2018-01-20 23:54:21,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:21,845 INFO L225 Difference]: With dead ends: 44 [2018-01-20 23:54:21,845 INFO L226 Difference]: Without dead ends: 35 [2018-01-20 23:54:21,846 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1116, Invalid=2076, Unknown=0, NotChecked=0, Total=3192 [2018-01-20 23:54:21,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-01-20 23:54:21,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-01-20 23:54:21,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-01-20 23:54:21,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-01-20 23:54:21,849 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-01-20 23:54:21,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:21,850 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-01-20 23:54:21,850 INFO L433 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-01-20 23:54:21,850 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-01-20 23:54:21,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-20 23:54:21,851 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:21,851 INFO L322 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:21,851 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:21,851 INFO L82 PathProgramCache]: Analyzing trace with hash 322463179, now seen corresponding path program 17 times [2018-01-20 23:54:21,851 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:21,852 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:21,852 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:21,852 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:21,852 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:21,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:21,861 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:22,082 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:22,083 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:22,083 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:22,083 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:22,083 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:22,083 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:22,083 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:22,089 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:22,089 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:22,092 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,093 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,094 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,095 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,095 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,096 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,097 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,098 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,099 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,102 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,103 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:22,104 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:22,234 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:22,234 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:22,796 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:22,816 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:22,816 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 35 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:22,819 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:22,820 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:22,824 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,825 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,829 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,833 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,837 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,841 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,846 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,851 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,857 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,867 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:22,876 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:22,879 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:22,884 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:22,884 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:23,015 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:23,017 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:23,017 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 59 [2018-01-20 23:54:23,017 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:23,017 INFO L409 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-01-20 23:54:23,017 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-01-20 23:54:23,018 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2228, Unknown=0, NotChecked=0, Total=3422 [2018-01-20 23:54:23,018 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 40 states. [2018-01-20 23:54:23,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:23,071 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-01-20 23:54:23,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-20 23:54:23,071 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 34 [2018-01-20 23:54:23,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:23,072 INFO L225 Difference]: With dead ends: 45 [2018-01-20 23:54:23,072 INFO L226 Difference]: Without dead ends: 36 [2018-01-20 23:54:23,073 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1235, Invalid=2305, Unknown=0, NotChecked=0, Total=3540 [2018-01-20 23:54:23,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-20 23:54:23,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-20 23:54:23,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-20 23:54:23,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-01-20 23:54:23,075 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-01-20 23:54:23,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:23,075 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-01-20 23:54:23,075 INFO L433 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-01-20 23:54:23,075 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-01-20 23:54:23,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-20 23:54:23,076 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:23,076 INFO L322 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:23,076 INFO L371 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:23,076 INFO L82 PathProgramCache]: Analyzing trace with hash 4448816, now seen corresponding path program 18 times [2018-01-20 23:54:23,076 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:23,076 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:23,076 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:23,077 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:23,077 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:23,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:23,083 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:23,307 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:23,308 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:23,308 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:23,308 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:23,308 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:23,308 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:23,308 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:23,314 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:23,315 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:23,321 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,323 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,324 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,325 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,326 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,327 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,328 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,329 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,330 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,331 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:23,331 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:23,333 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:23,486 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:23,486 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:24,082 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,101 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:24,102 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 37 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:24,104 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:24,104 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:24,113 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,120 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,128 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,135 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,144 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,153 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,162 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,172 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,182 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,193 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:24,201 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:24,204 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:24,209 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,209 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:24,337 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,338 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:24,338 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 62 [2018-01-20 23:54:24,338 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:24,339 INFO L409 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-01-20 23:54:24,339 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-01-20 23:54:24,340 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1317, Invalid=2465, Unknown=0, NotChecked=0, Total=3782 [2018-01-20 23:54:24,340 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 42 states. [2018-01-20 23:54:24,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:24,380 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-01-20 23:54:24,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-20 23:54:24,380 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 35 [2018-01-20 23:54:24,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:24,381 INFO L225 Difference]: With dead ends: 46 [2018-01-20 23:54:24,381 INFO L226 Difference]: Without dead ends: 37 [2018-01-20 23:54:24,382 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1360, Invalid=2546, Unknown=0, NotChecked=0, Total=3906 [2018-01-20 23:54:24,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-20 23:54:24,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-20 23:54:24,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-20 23:54:24,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-01-20 23:54:24,386 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-01-20 23:54:24,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:24,386 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-01-20 23:54:24,386 INFO L433 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-01-20 23:54:24,386 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-01-20 23:54:24,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-20 23:54:24,387 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:24,387 INFO L322 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:24,387 INFO L371 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:24,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1264061845, now seen corresponding path program 19 times [2018-01-20 23:54:24,387 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:24,388 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:24,388 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:24,388 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:24,388 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:24,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:24,395 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:24,612 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,612 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:24,612 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:24,612 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:24,612 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:24,612 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:24,612 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:24,617 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:24,617 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:24,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:24,631 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:24,793 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:24,793 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:25,380 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:25,400 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:25,400 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 39 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:25,403 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:25,403 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:25,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:25,428 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:25,433 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:25,433 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:25,572 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:25,573 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:25,573 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 65 [2018-01-20 23:54:25,574 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:25,574 INFO L409 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-01-20 23:54:25,574 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-01-20 23:54:25,575 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1446, Invalid=2714, Unknown=0, NotChecked=0, Total=4160 [2018-01-20 23:54:25,575 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 44 states. [2018-01-20 23:54:25,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:25,622 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-01-20 23:54:25,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-20 23:54:25,622 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 36 [2018-01-20 23:54:25,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:25,623 INFO L225 Difference]: With dead ends: 47 [2018-01-20 23:54:25,623 INFO L226 Difference]: Without dead ends: 38 [2018-01-20 23:54:25,623 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1491, Invalid=2799, Unknown=0, NotChecked=0, Total=4290 [2018-01-20 23:54:25,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-01-20 23:54:25,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-01-20 23:54:25,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-20 23:54:25,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-01-20 23:54:25,626 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-01-20 23:54:25,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:25,626 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-01-20 23:54:25,626 INFO L433 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-01-20 23:54:25,626 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-01-20 23:54:25,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-20 23:54:25,626 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:25,626 INFO L322 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:25,626 INFO L371 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:25,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1933186672, now seen corresponding path program 20 times [2018-01-20 23:54:25,627 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:25,627 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:25,627 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:25,627 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:25,627 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:25,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:25,636 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:25,877 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:25,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:25,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:25,877 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:25,877 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:25,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:25,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:25,882 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:25,882 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:25,890 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,897 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:25,899 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:25,901 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:26,084 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:26,084 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:26,716 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:26,735 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:26,735 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 41 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:26,738 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:26,738 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:26,748 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,759 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:26,770 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:26,773 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:26,778 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:26,778 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:26,928 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:26,929 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:26,930 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 68 [2018-01-20 23:54:26,930 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:26,930 INFO L409 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-01-20 23:54:26,931 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-01-20 23:54:26,931 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1583, Invalid=2973, Unknown=0, NotChecked=0, Total=4556 [2018-01-20 23:54:26,931 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 46 states. [2018-01-20 23:54:26,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:26,975 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-01-20 23:54:26,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-20 23:54:26,975 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 37 [2018-01-20 23:54:26,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:26,976 INFO L225 Difference]: With dead ends: 48 [2018-01-20 23:54:26,976 INFO L226 Difference]: Without dead ends: 39 [2018-01-20 23:54:26,976 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1916 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1630, Invalid=3062, Unknown=0, NotChecked=0, Total=4692 [2018-01-20 23:54:26,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-20 23:54:26,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-20 23:54:26,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-20 23:54:26,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-01-20 23:54:26,979 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-01-20 23:54:26,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:26,979 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-01-20 23:54:26,979 INFO L433 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-01-20 23:54:26,979 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-01-20 23:54:26,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-01-20 23:54:26,979 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:26,979 INFO L322 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:26,979 INFO L371 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:26,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1201219829, now seen corresponding path program 21 times [2018-01-20 23:54:26,980 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:26,980 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:26,980 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:26,980 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:26,980 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:26,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:26,988 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:27,214 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:27,214 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:27,214 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:27,215 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:27,215 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:27,215 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:27,215 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:27,220 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:27,220 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:27,226 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,228 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,229 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,230 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,231 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,232 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,233 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,234 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,235 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,236 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,237 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,238 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:27,238 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:27,240 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:27,417 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:27,417 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:28,090 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:28,110 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:28,110 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 43 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:28,112 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:28,113 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:28,121 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,128 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,135 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,143 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,151 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,160 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,170 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,179 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,189 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,200 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,211 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,222 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:28,230 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:28,233 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:28,238 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:28,238 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:28,394 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:28,395 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:28,395 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 71 [2018-01-20 23:54:28,395 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:28,395 INFO L409 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-01-20 23:54:28,396 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-01-20 23:54:28,396 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1726, Invalid=3244, Unknown=0, NotChecked=0, Total=4970 [2018-01-20 23:54:28,396 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 48 states. [2018-01-20 23:54:28,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:28,449 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-01-20 23:54:28,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-20 23:54:28,449 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 38 [2018-01-20 23:54:28,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:28,450 INFO L225 Difference]: With dead ends: 49 [2018-01-20 23:54:28,450 INFO L226 Difference]: Without dead ends: 40 [2018-01-20 23:54:28,450 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2136 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1775, Invalid=3337, Unknown=0, NotChecked=0, Total=5112 [2018-01-20 23:54:28,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-20 23:54:28,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-20 23:54:28,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-20 23:54:28,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-01-20 23:54:28,454 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-01-20 23:54:28,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:28,454 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-01-20 23:54:28,454 INFO L433 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-01-20 23:54:28,454 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-01-20 23:54:28,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-20 23:54:28,455 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:28,455 INFO L322 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:28,455 INFO L371 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:28,455 INFO L82 PathProgramCache]: Analyzing trace with hash 14915824, now seen corresponding path program 22 times [2018-01-20 23:54:28,455 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:28,456 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:28,456 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:28,456 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:28,456 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:28,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:28,462 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:28,699 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:28,699 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:28,699 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:28,699 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:28,699 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:28,699 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:28,699 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:28,704 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:28,704 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:28,717 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:28,719 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:28,919 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:28,919 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:29,658 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:29,690 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:29,690 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 45 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:29,694 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:29,694 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:29,730 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:29,734 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:29,740 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:29,740 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:29,914 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:29,915 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:29,915 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 74 [2018-01-20 23:54:29,915 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:29,916 INFO L409 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-01-20 23:54:29,916 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-01-20 23:54:29,916 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1875, Invalid=3527, Unknown=0, NotChecked=0, Total=5402 [2018-01-20 23:54:29,916 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 50 states. [2018-01-20 23:54:30,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:30,001 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-01-20 23:54:30,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-20 23:54:30,001 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 39 [2018-01-20 23:54:30,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:30,002 INFO L225 Difference]: With dead ends: 50 [2018-01-20 23:54:30,002 INFO L226 Difference]: Without dead ends: 41 [2018-01-20 23:54:30,002 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2368 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1926, Invalid=3624, Unknown=0, NotChecked=0, Total=5550 [2018-01-20 23:54:30,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-01-20 23:54:30,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-01-20 23:54:30,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-20 23:54:30,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-01-20 23:54:30,006 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-01-20 23:54:30,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:30,006 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-01-20 23:54:30,006 INFO L433 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-01-20 23:54:30,007 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-01-20 23:54:30,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-01-20 23:54:30,007 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:30,007 INFO L322 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:30,007 INFO L371 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:30,007 INFO L82 PathProgramCache]: Analyzing trace with hash -939584597, now seen corresponding path program 23 times [2018-01-20 23:54:30,007 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:30,008 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:30,008 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:30,008 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:30,008 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:30,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:30,014 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:30,297 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:30,297 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:30,297 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:30,297 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:30,297 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:30,298 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:30,298 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:30,302 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:30,303 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:30,306 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,307 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,308 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,309 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,310 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,310 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,311 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,312 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,313 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,314 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,315 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,315 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,319 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:30,320 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:30,322 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:30,537 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:30,537 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:31,280 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:31,300 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:31,300 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 47 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:31,303 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:31,303 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:31,308 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,309 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,313 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,316 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,320 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,326 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,331 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,337 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,342 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,348 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,354 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,361 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,373 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:31,382 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:31,385 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:31,391 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:31,391 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:31,580 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:31,581 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:31,581 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 77 [2018-01-20 23:54:31,581 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:31,582 INFO L409 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-01-20 23:54:31,582 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-01-20 23:54:31,583 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2030, Invalid=3822, Unknown=0, NotChecked=0, Total=5852 [2018-01-20 23:54:31,583 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 52 states. [2018-01-20 23:54:31,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:31,665 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-01-20 23:54:31,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-20 23:54:31,666 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 40 [2018-01-20 23:54:31,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:31,666 INFO L225 Difference]: With dead ends: 51 [2018-01-20 23:54:31,666 INFO L226 Difference]: Without dead ends: 42 [2018-01-20 23:54:31,667 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2612 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2083, Invalid=3923, Unknown=0, NotChecked=0, Total=6006 [2018-01-20 23:54:31,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-01-20 23:54:31,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-01-20 23:54:31,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-01-20 23:54:31,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-01-20 23:54:31,669 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-01-20 23:54:31,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:31,669 INFO L432 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-01-20 23:54:31,669 INFO L433 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-01-20 23:54:31,669 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-01-20 23:54:31,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-20 23:54:31,670 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:31,670 INFO L322 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:31,670 INFO L371 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:31,670 INFO L82 PathProgramCache]: Analyzing trace with hash -464326576, now seen corresponding path program 24 times [2018-01-20 23:54:31,670 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:31,671 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:31,671 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:31,671 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:31,671 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:31,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:31,679 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:31,946 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:31,946 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:31,947 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:31,947 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:31,947 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:31,947 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:31,947 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:31,952 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:31,952 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:31,958 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,960 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,961 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,962 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,963 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,964 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,965 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,966 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,967 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,968 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,969 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,970 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,971 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:31,971 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:31,973 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:32,196 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:32,196 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:32,989 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:33,009 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:33,009 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 49 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:33,012 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:33,012 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:33,020 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,027 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,034 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,042 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,051 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,060 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,069 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,079 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,089 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,099 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,110 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,121 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,133 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:33,142 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:33,145 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:33,151 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:33,151 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:33,346 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:33,347 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:33,347 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 80 [2018-01-20 23:54:33,347 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:33,348 INFO L409 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-01-20 23:54:33,348 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-01-20 23:54:33,349 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2191, Invalid=4129, Unknown=0, NotChecked=0, Total=6320 [2018-01-20 23:54:33,349 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 54 states. [2018-01-20 23:54:33,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:33,442 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-01-20 23:54:33,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-20 23:54:33,442 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 41 [2018-01-20 23:54:33,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:33,443 INFO L225 Difference]: With dead ends: 52 [2018-01-20 23:54:33,443 INFO L226 Difference]: Without dead ends: 43 [2018-01-20 23:54:33,444 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2868 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2246, Invalid=4234, Unknown=0, NotChecked=0, Total=6480 [2018-01-20 23:54:33,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-20 23:54:33,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-20 23:54:33,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-20 23:54:33,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-01-20 23:54:33,448 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-01-20 23:54:33,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:33,448 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-01-20 23:54:33,448 INFO L433 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-01-20 23:54:33,448 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-01-20 23:54:33,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-20 23:54:33,449 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:33,449 INFO L322 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:33,449 INFO L371 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:33,449 INFO L82 PathProgramCache]: Analyzing trace with hash 1383770187, now seen corresponding path program 25 times [2018-01-20 23:54:33,449 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:33,450 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:33,450 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:33,450 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:33,450 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:33,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:33,461 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:33,792 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:33,792 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:33,792 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:33,792 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:33,792 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:33,793 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:33,793 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:33,797 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:33,797 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:33,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:33,811 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:34,054 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:34,054 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:34,880 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:34,899 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:34,899 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 51 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:34,902 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:34,902 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:34,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:34,933 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:34,938 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:34,939 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:35,157 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:35,158 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:35,158 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 83 [2018-01-20 23:54:35,158 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:35,158 INFO L409 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-01-20 23:54:35,159 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-01-20 23:54:35,159 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2358, Invalid=4448, Unknown=0, NotChecked=0, Total=6806 [2018-01-20 23:54:35,159 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 56 states. [2018-01-20 23:54:35,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:35,231 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-01-20 23:54:35,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-20 23:54:35,231 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 42 [2018-01-20 23:54:35,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:35,232 INFO L225 Difference]: With dead ends: 53 [2018-01-20 23:54:35,232 INFO L226 Difference]: Without dead ends: 44 [2018-01-20 23:54:35,232 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3136 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2415, Invalid=4557, Unknown=0, NotChecked=0, Total=6972 [2018-01-20 23:54:35,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-01-20 23:54:35,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-01-20 23:54:35,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-20 23:54:35,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-01-20 23:54:35,235 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-01-20 23:54:35,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:35,235 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-01-20 23:54:35,235 INFO L433 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-01-20 23:54:35,235 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-01-20 23:54:35,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-01-20 23:54:35,236 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:35,236 INFO L322 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:35,236 INFO L371 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:35,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1454772304, now seen corresponding path program 26 times [2018-01-20 23:54:35,236 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:35,236 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:35,236 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:35,236 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:35,237 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:35,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:35,244 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:35,556 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:35,556 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:35,556 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:35,557 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:35,557 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:35,557 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:35,557 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:35,562 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:35,562 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:35,568 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:35,574 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:35,575 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:35,576 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:35,827 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:35,827 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:36,696 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:36,716 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:36,716 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 53 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:36,719 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:36,719 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:36,729 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:36,742 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:36,754 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:36,758 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:36,764 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:36,764 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:36,972 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:36,973 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:36,973 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 86 [2018-01-20 23:54:36,973 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:36,974 INFO L409 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-01-20 23:54:36,974 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-01-20 23:54:36,974 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2531, Invalid=4779, Unknown=0, NotChecked=0, Total=7310 [2018-01-20 23:54:36,974 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 58 states. [2018-01-20 23:54:37,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:37,043 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-01-20 23:54:37,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-01-20 23:54:37,043 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 43 [2018-01-20 23:54:37,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:37,044 INFO L225 Difference]: With dead ends: 54 [2018-01-20 23:54:37,044 INFO L226 Difference]: Without dead ends: 45 [2018-01-20 23:54:37,044 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3416 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2590, Invalid=4892, Unknown=0, NotChecked=0, Total=7482 [2018-01-20 23:54:37,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-01-20 23:54:37,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-01-20 23:54:37,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-01-20 23:54:37,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-01-20 23:54:37,047 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-01-20 23:54:37,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:37,047 INFO L432 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-01-20 23:54:37,047 INFO L433 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-01-20 23:54:37,047 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-01-20 23:54:37,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-20 23:54:37,047 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:37,047 INFO L322 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:37,047 INFO L371 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:37,047 INFO L82 PathProgramCache]: Analyzing trace with hash 744723691, now seen corresponding path program 27 times [2018-01-20 23:54:37,048 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:37,048 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:37,048 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:37,048 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:37,048 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:37,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:37,055 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:37,454 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:37,454 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:37,454 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:37,454 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:37,454 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:37,454 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:37,454 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:37,459 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:37,459 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:37,467 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,469 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,470 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,471 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,473 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,474 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,475 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,476 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,477 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,478 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,479 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,480 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,481 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,482 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,483 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:37,484 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:37,485 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:37,762 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:37,762 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:38,671 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:38,691 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:38,691 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 55 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:38,694 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:38,694 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:38,705 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,713 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,721 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,729 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,737 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,746 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,755 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,764 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,774 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,786 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,797 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,808 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,820 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,833 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,845 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:38,855 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:38,858 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:38,864 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:38,864 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:39,085 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:39,086 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:39,086 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 89 [2018-01-20 23:54:39,086 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:39,086 INFO L409 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-01-20 23:54:39,086 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-01-20 23:54:39,087 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2710, Invalid=5122, Unknown=0, NotChecked=0, Total=7832 [2018-01-20 23:54:39,087 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 60 states. [2018-01-20 23:54:39,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:39,143 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-01-20 23:54:39,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-20 23:54:39,144 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 44 [2018-01-20 23:54:39,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:39,144 INFO L225 Difference]: With dead ends: 55 [2018-01-20 23:54:39,144 INFO L226 Difference]: Without dead ends: 46 [2018-01-20 23:54:39,145 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3708 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2771, Invalid=5239, Unknown=0, NotChecked=0, Total=8010 [2018-01-20 23:54:39,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-20 23:54:39,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-01-20 23:54:39,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-20 23:54:39,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-01-20 23:54:39,147 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-01-20 23:54:39,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:39,147 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-01-20 23:54:39,148 INFO L433 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-01-20 23:54:39,148 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-01-20 23:54:39,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-01-20 23:54:39,148 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:39,148 INFO L322 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:39,149 INFO L371 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:39,149 INFO L82 PathProgramCache]: Analyzing trace with hash 209622800, now seen corresponding path program 28 times [2018-01-20 23:54:39,149 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:39,149 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:39,150 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:39,150 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:39,150 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:39,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:39,161 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:39,506 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:39,507 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:39,507 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:39,507 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:39,507 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:39,507 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:39,507 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:39,513 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:39,513 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:39,526 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:39,528 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:39,816 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:39,816 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:40,818 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:40,838 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:40,838 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 57 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:40,841 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:40,841 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:40,880 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:40,884 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:40,890 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:40,890 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:41,124 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:41,125 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:41,125 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 92 [2018-01-20 23:54:41,125 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:41,125 INFO L409 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-01-20 23:54:41,125 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-01-20 23:54:41,126 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2895, Invalid=5477, Unknown=0, NotChecked=0, Total=8372 [2018-01-20 23:54:41,126 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 62 states. [2018-01-20 23:54:41,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:41,188 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-01-20 23:54:41,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-20 23:54:41,188 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 45 [2018-01-20 23:54:41,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:41,188 INFO L225 Difference]: With dead ends: 56 [2018-01-20 23:54:41,188 INFO L226 Difference]: Without dead ends: 47 [2018-01-20 23:54:41,189 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4012 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2958, Invalid=5598, Unknown=0, NotChecked=0, Total=8556 [2018-01-20 23:54:41,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-01-20 23:54:41,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-01-20 23:54:41,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-20 23:54:41,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-01-20 23:54:41,192 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-01-20 23:54:41,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:41,192 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-01-20 23:54:41,192 INFO L433 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-01-20 23:54:41,192 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-01-20 23:54:41,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-20 23:54:41,192 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:41,192 INFO L322 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:41,192 INFO L371 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:41,192 INFO L82 PathProgramCache]: Analyzing trace with hash 801364363, now seen corresponding path program 29 times [2018-01-20 23:54:41,193 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:41,193 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:41,193 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:41,193 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:41,193 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:41,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:41,204 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:41,707 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:41,707 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:41,707 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:41,707 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:41,707 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:41,707 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:41,707 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:41,718 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:41,718 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:41,723 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,729 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,730 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,731 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,732 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,733 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,734 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,735 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,736 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,738 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,739 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,740 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,741 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,742 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,743 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,748 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:41,749 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:41,751 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:42,127 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:42,127 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:43,125 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:43,145 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:43,145 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 59 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:43,148 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:43,148 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:43,153 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,155 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,159 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,163 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,167 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,172 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,177 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,183 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,189 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,195 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,202 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,210 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,218 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,226 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,235 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,249 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:43,261 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:43,265 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:43,275 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:43,275 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:43,553 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:43,554 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:43,554 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 95 [2018-01-20 23:54:43,554 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:43,555 INFO L409 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-01-20 23:54:43,555 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-01-20 23:54:43,555 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3086, Invalid=5844, Unknown=0, NotChecked=0, Total=8930 [2018-01-20 23:54:43,555 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 64 states. [2018-01-20 23:54:43,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:43,626 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-01-20 23:54:43,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-20 23:54:43,626 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 46 [2018-01-20 23:54:43,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:43,627 INFO L225 Difference]: With dead ends: 57 [2018-01-20 23:54:43,627 INFO L226 Difference]: Without dead ends: 48 [2018-01-20 23:54:43,628 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4328 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=3151, Invalid=5969, Unknown=0, NotChecked=0, Total=9120 [2018-01-20 23:54:43,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-01-20 23:54:43,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-01-20 23:54:43,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-20 23:54:43,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-01-20 23:54:43,630 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-01-20 23:54:43,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:43,630 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-01-20 23:54:43,630 INFO L433 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-01-20 23:54:43,630 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-01-20 23:54:43,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-20 23:54:43,630 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:43,630 INFO L322 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:43,631 INFO L371 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:43,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1965483632, now seen corresponding path program 30 times [2018-01-20 23:54:43,631 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:43,631 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:43,631 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:43,632 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:43,632 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:43,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:43,640 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:44,006 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:44,006 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:44,006 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:44,006 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:44,007 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:44,007 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:44,007 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:44,011 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:44,011 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:44,017 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,019 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,020 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,021 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,022 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,023 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,024 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,025 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,026 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,027 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,028 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,029 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,030 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,031 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,032 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,034 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:44,034 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:44,036 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:44,357 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:44,357 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:45,419 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:45,439 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:45,439 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 61 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:45,442 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:54:45,442 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:54:45,451 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,458 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,466 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,474 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,482 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,491 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,501 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,511 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,521 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,532 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,543 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,554 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,567 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,579 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,592 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,605 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:54:45,615 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:45,619 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:45,625 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:45,625 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:45,882 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:45,884 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:45,884 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 98 [2018-01-20 23:54:45,884 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:45,884 INFO L409 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-01-20 23:54:45,884 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-01-20 23:54:45,885 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3283, Invalid=6223, Unknown=0, NotChecked=0, Total=9506 [2018-01-20 23:54:45,885 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 66 states. [2018-01-20 23:54:45,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:45,941 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-01-20 23:54:45,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-01-20 23:54:45,941 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 47 [2018-01-20 23:54:45,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:45,942 INFO L225 Difference]: With dead ends: 58 [2018-01-20 23:54:45,942 INFO L226 Difference]: Without dead ends: 49 [2018-01-20 23:54:45,942 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4656 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=3350, Invalid=6352, Unknown=0, NotChecked=0, Total=9702 [2018-01-20 23:54:45,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-20 23:54:45,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-01-20 23:54:45,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-01-20 23:54:45,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-01-20 23:54:45,945 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-01-20 23:54:45,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:45,946 INFO L432 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-01-20 23:54:45,946 INFO L433 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-01-20 23:54:45,946 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-01-20 23:54:45,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-01-20 23:54:45,947 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:45,947 INFO L322 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:45,947 INFO L371 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:45,947 INFO L82 PathProgramCache]: Analyzing trace with hash -601524693, now seen corresponding path program 31 times [2018-01-20 23:54:45,947 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:45,947 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:45,948 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:45,948 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:45,948 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:45,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:45,955 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:46,352 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:46,352 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:46,352 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:46,352 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:46,352 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:46,352 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:46,352 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:46,357 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:46,357 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:46,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:46,373 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:46,887 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:46,887 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:48,025 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:48,044 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:48,044 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 63 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:48,047 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:48,047 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:54:48,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:48,083 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:48,089 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:48,090 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:48,352 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:48,353 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:48,353 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 101 [2018-01-20 23:54:48,353 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:48,354 INFO L409 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-01-20 23:54:48,354 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-01-20 23:54:48,354 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=6614, Unknown=0, NotChecked=0, Total=10100 [2018-01-20 23:54:48,354 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 68 states. [2018-01-20 23:54:48,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:48,428 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-01-20 23:54:48,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-20 23:54:48,429 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 48 [2018-01-20 23:54:48,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:48,429 INFO L225 Difference]: With dead ends: 59 [2018-01-20 23:54:48,429 INFO L226 Difference]: Without dead ends: 50 [2018-01-20 23:54:48,430 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 124 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4996 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=3555, Invalid=6747, Unknown=0, NotChecked=0, Total=10302 [2018-01-20 23:54:48,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-20 23:54:48,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-01-20 23:54:48,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-20 23:54:48,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-01-20 23:54:48,432 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-01-20 23:54:48,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:48,432 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-01-20 23:54:48,432 INFO L433 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-01-20 23:54:48,432 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-01-20 23:54:48,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-20 23:54:48,433 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:48,433 INFO L322 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:48,433 INFO L371 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:48,433 INFO L82 PathProgramCache]: Analyzing trace with hash 1425595856, now seen corresponding path program 32 times [2018-01-20 23:54:48,434 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:48,434 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:48,434 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:54:48,434 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:48,435 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:48,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:48,447 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:48,999 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:48,999 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:48,999 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:48,999 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:48,999 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:48,999 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:48,999 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:49,004 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:49,004 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:49,010 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:49,016 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:49,018 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:49,019 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:49,386 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:49,386 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:50,549 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:50,569 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:50,569 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 65 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:50,572 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:54:50,572 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:50,582 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:50,597 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:50,610 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:50,613 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:50,620 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:50,620 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:50,907 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:50,908 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:50,908 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 104 [2018-01-20 23:54:50,908 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:50,908 INFO L409 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-01-20 23:54:50,909 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-01-20 23:54:50,909 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3695, Invalid=7017, Unknown=0, NotChecked=0, Total=10712 [2018-01-20 23:54:50,909 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 70 states. [2018-01-20 23:54:51,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:51,027 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-01-20 23:54:51,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-01-20 23:54:51,027 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 49 [2018-01-20 23:54:51,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:51,028 INFO L225 Difference]: With dead ends: 60 [2018-01-20 23:54:51,028 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:54:51,029 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5348 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=3766, Invalid=7154, Unknown=0, NotChecked=0, Total=10920 [2018-01-20 23:54:51,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:54:51,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-01-20 23:54:51,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-01-20 23:54:51,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-01-20 23:54:51,031 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-01-20 23:54:51,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:51,032 INFO L432 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-01-20 23:54:51,032 INFO L433 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-01-20 23:54:51,032 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-01-20 23:54:51,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-01-20 23:54:51,032 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:51,032 INFO L322 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:51,032 INFO L371 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:51,033 INFO L82 PathProgramCache]: Analyzing trace with hash -158176565, now seen corresponding path program 33 times [2018-01-20 23:54:51,033 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:51,033 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:51,033 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:51,033 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:51,033 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:51,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:51,042 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:51,525 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:51,525 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:51,525 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:51,525 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:51,526 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:51,526 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:51,526 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:51,530 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:51,530 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:51,537 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,538 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,539 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,540 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,541 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,542 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,543 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,544 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,546 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,547 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,548 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,549 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,550 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,551 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,553 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,554 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,555 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,556 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:51,557 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:51,558 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:51,948 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:51,948 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:53,153 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:53,173 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:53,173 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 67 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:53,176 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:54:53,177 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:54:53,186 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,193 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,200 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,208 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,216 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,224 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,234 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,244 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,254 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,265 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,276 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,288 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,300 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,312 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,325 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,338 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,352 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,366 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:54:53,377 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:53,380 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:53,387 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:53,387 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:53,672 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:53,673 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:53,673 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 107 [2018-01-20 23:54:53,673 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:53,673 INFO L409 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-01-20 23:54:53,673 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-01-20 23:54:53,674 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3910, Invalid=7432, Unknown=0, NotChecked=0, Total=11342 [2018-01-20 23:54:53,674 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 72 states. [2018-01-20 23:54:53,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:53,749 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-01-20 23:54:53,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-01-20 23:54:53,749 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 50 [2018-01-20 23:54:53,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:53,750 INFO L225 Difference]: With dead ends: 61 [2018-01-20 23:54:53,750 INFO L226 Difference]: Without dead ends: 52 [2018-01-20 23:54:53,750 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5712 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=3983, Invalid=7573, Unknown=0, NotChecked=0, Total=11556 [2018-01-20 23:54:53,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-01-20 23:54:53,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-01-20 23:54:53,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-20 23:54:53,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-01-20 23:54:53,753 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-01-20 23:54:53,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:53,753 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-01-20 23:54:53,753 INFO L433 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-01-20 23:54:53,754 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-01-20 23:54:53,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-01-20 23:54:53,754 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:53,754 INFO L322 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:53,754 INFO L371 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:53,754 INFO L82 PathProgramCache]: Analyzing trace with hash -2010481360, now seen corresponding path program 34 times [2018-01-20 23:54:53,754 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:53,755 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:53,755 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:53,755 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:53,755 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:53,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:53,763 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:54,235 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:54,235 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:54,236 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:54,236 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:54,236 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:54,236 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:54,236 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:54,240 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:54,241 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:54,255 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:54,257 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:54,659 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:54,659 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:55,921 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:55,940 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:55,940 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 69 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:55,943 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:54:55,943 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:54:55,985 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:55,988 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:55,995 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:55,995 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:56,292 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:56,293 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:56,294 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 110 [2018-01-20 23:54:56,294 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:56,294 INFO L409 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-01-20 23:54:56,294 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-01-20 23:54:56,295 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=4131, Invalid=7859, Unknown=0, NotChecked=0, Total=11990 [2018-01-20 23:54:56,295 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 74 states. [2018-01-20 23:54:56,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:56,429 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-01-20 23:54:56,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-20 23:54:56,429 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 51 [2018-01-20 23:54:56,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:56,429 INFO L225 Difference]: With dead ends: 62 [2018-01-20 23:54:56,429 INFO L226 Difference]: Without dead ends: 53 [2018-01-20 23:54:56,430 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 130 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6088 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=4206, Invalid=8004, Unknown=0, NotChecked=0, Total=12210 [2018-01-20 23:54:56,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-01-20 23:54:56,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-01-20 23:54:56,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-20 23:54:56,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-01-20 23:54:56,433 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-01-20 23:54:56,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:56,434 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-01-20 23:54:56,434 INFO L433 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-01-20 23:54:56,434 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-01-20 23:54:56,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-20 23:54:56,434 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:56,435 INFO L322 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:56,435 INFO L371 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:56,435 INFO L82 PathProgramCache]: Analyzing trace with hash 697612139, now seen corresponding path program 35 times [2018-01-20 23:54:56,435 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:56,436 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:56,436 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:56,436 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:56,436 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:56,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:56,445 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:54:57,168 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:57,169 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:57,169 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:54:57,169 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:54:57,169 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:54:57,169 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:57,169 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:54:57,177 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:57,177 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:57,182 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,183 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,184 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,184 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,185 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,186 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,187 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,188 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,190 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,191 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,192 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,193 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,194 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,195 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,197 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,198 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,199 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,201 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,205 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:57,207 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:57,209 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:57,678 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:57,679 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:58,993 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:59,012 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:54:59,012 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 71 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:54:59,015 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:54:59,015 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:54:59,020 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,022 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,025 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,029 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,033 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,037 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,042 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,047 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,052 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,058 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,065 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,072 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,079 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,087 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,095 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,104 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,113 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,122 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,137 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:54:59,149 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:54:59,153 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:54:59,161 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:59,161 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:54:59,471 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:54:59,472 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:54:59,472 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 113 [2018-01-20 23:54:59,472 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:54:59,473 INFO L409 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-01-20 23:54:59,473 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-01-20 23:54:59,473 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=4358, Invalid=8298, Unknown=0, NotChecked=0, Total=12656 [2018-01-20 23:54:59,474 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 76 states. [2018-01-20 23:54:59,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:54:59,549 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-01-20 23:54:59,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-01-20 23:54:59,550 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 52 [2018-01-20 23:54:59,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:54:59,550 INFO L225 Difference]: With dead ends: 63 [2018-01-20 23:54:59,550 INFO L226 Difference]: Without dead ends: 54 [2018-01-20 23:54:59,551 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6476 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4435, Invalid=8447, Unknown=0, NotChecked=0, Total=12882 [2018-01-20 23:54:59,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-01-20 23:54:59,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-01-20 23:54:59,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-01-20 23:54:59,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-01-20 23:54:59,554 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-01-20 23:54:59,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:54:59,554 INFO L432 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-01-20 23:54:59,554 INFO L433 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-01-20 23:54:59,554 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-01-20 23:54:59,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-01-20 23:54:59,554 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:54:59,555 INFO L322 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:54:59,555 INFO L371 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:54:59,555 INFO L82 PathProgramCache]: Analyzing trace with hash -1250835312, now seen corresponding path program 36 times [2018-01-20 23:54:59,555 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:54:59,556 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:59,556 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:54:59,556 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:54:59,556 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:54:59,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:54:59,570 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:55:00,132 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:00,132 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:00,132 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:55:00,132 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:55:00,132 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:55:00,132 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:00,132 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:55:00,137 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:55:00,137 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:55:00,143 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,145 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,146 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,147 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,148 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,149 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,150 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,151 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,152 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,153 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,154 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,155 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,156 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,157 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,158 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,160 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,161 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,162 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,163 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:00,164 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:55:00,165 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:55:00,605 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:00,605 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:55:02,026 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:02,046 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:02,046 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 73 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 73 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:55:02,049 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:55:02,049 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:55:02,059 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,066 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,073 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,081 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,090 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,099 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,109 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,118 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,128 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,139 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,150 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,162 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,174 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,187 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,201 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,215 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,230 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,245 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,260 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:55:02,273 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:55:02,277 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:55:02,284 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:02,284 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:55:02,603 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:02,604 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:55:02,604 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40, 40, 40] total 116 [2018-01-20 23:55:02,604 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:55:02,604 INFO L409 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-01-20 23:55:02,605 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-01-20 23:55:02,605 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=4591, Invalid=8749, Unknown=0, NotChecked=0, Total=13340 [2018-01-20 23:55:02,605 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 78 states. [2018-01-20 23:55:02,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:55:02,684 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-01-20 23:55:02,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-01-20 23:55:02,685 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 53 [2018-01-20 23:55:02,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:55:02,686 INFO L225 Difference]: With dead ends: 64 [2018-01-20 23:55:02,686 INFO L226 Difference]: Without dead ends: 55 [2018-01-20 23:55:02,686 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6876 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=4670, Invalid=8902, Unknown=0, NotChecked=0, Total=13572 [2018-01-20 23:55:02,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-20 23:55:02,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-01-20 23:55:02,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-20 23:55:02,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-01-20 23:55:02,688 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2018-01-20 23:55:02,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:55:02,689 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-01-20 23:55:02,689 INFO L433 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-01-20 23:55:02,689 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-01-20 23:55:02,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-01-20 23:55:02,689 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:55:02,689 INFO L322 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:55:02,690 INFO L371 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:55:02,690 INFO L82 PathProgramCache]: Analyzing trace with hash -1523164149, now seen corresponding path program 37 times [2018-01-20 23:55:02,690 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:55:02,690 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:55:02,691 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:55:02,691 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:55:02,691 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:55:02,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:55:02,700 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:55:03,279 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:03,279 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:03,279 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:55:03,279 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:55:03,280 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:55:03,280 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:55:03,280 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:55:03,287 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:55:03,287 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:55:03,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:55:03,305 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:55:03,786 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:55:03,786 INFO L314 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-01-20 23:55:05,074 INFO L175 TraceCheckSpWp]: Timeout while computing interpolants [2018-01-20 23:55:05,074 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-20 23:55:05,076 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:55:05,076 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:55:05,076 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:55:05,076 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:55:05,076 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:55:05,077 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:55:05,077 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:55:05,077 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-20 23:55:05,077 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:55:05,077 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-01-20 23:55:05,077 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-20 23:55:05,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.01 11:55:05 BoogieIcfgContainer [2018-01-20 23:55:05,078 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-01-20 23:55:05,079 INFO L168 Benchmark]: Toolchain (without parser) took 56364.62 ms. Allocated memory was 301.5 MB in the beginning and 829.4 MB in the end (delta: 528.0 MB). Free memory was 260.8 MB in the beginning and 706.2 MB in the end (delta: -445.5 MB). Peak memory consumption was 82.5 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,079 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 301.5 MB. Free memory is still 265.8 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-20 23:55:05,079 INFO L168 Benchmark]: CACSL2BoogieTranslator took 159.70 ms. Allocated memory is still 301.5 MB. Free memory was 260.8 MB in the beginning and 252.6 MB in the end (delta: 8.1 MB). Peak memory consumption was 8.1 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,080 INFO L168 Benchmark]: Boogie Preprocessor took 39.76 ms. Allocated memory is still 301.5 MB. Free memory was 252.6 MB in the beginning and 250.6 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,080 INFO L168 Benchmark]: RCFGBuilder took 177.80 ms. Allocated memory is still 301.5 MB. Free memory was 250.6 MB in the beginning and 239.1 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,080 INFO L168 Benchmark]: TraceAbstraction took 55980.53 ms. Allocated memory was 301.5 MB in the beginning and 829.4 MB in the end (delta: 528.0 MB). Free memory was 239.1 MB in the beginning and 706.2 MB in the end (delta: -467.2 MB). Peak memory consumption was 60.8 MB. Max. memory is 5.3 GB. [2018-01-20 23:55:05,082 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 301.5 MB. Free memory is still 265.8 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 159.70 ms. Allocated memory is still 301.5 MB. Free memory was 260.8 MB in the beginning and 252.6 MB in the end (delta: 8.1 MB). Peak memory consumption was 8.1 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 39.76 ms. Allocated memory is still 301.5 MB. Free memory was 252.6 MB in the beginning and 250.6 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 177.80 ms. Allocated memory is still 301.5 MB. Free memory was 250.6 MB in the beginning and 239.1 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. * TraceAbstraction took 55980.53 ms. Allocated memory was 301.5 MB in the beginning and 829.4 MB in the end (delta: 528.0 MB). Free memory was 239.1 MB in the beginning and 706.2 MB in the end (delta: -467.2 MB). Peak memory consumption was 60.8 MB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 17 LocStat_MAX_WEQGRAPH_SIZE : 2 LocStat_MAX_SIZEOF_WEQEDGELABEL : 1 LocStat_NO_SUPPORTING_EQUALITIES : 102 LocStat_NO_SUPPORTING_DISEQUALITIES : 23 LocStat_NO_DISJUNCTIONS : -34 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 24 TransStat_MAX_WEQGRAPH_SIZE : 2 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 33 TransStat_NO_SUPPORTING_DISEQUALITIES : 5 TransStat_NO_DISJUNCTIONS : 24 TransStat_MAX_NO_DISJUNCTIONS : 1 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 0.326019 RENAME_VARIABLES(MILLISECONDS) : 0.082025 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 0.276066 PROJECTAWAY(MILLISECONDS) : 0.120155 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.170573 DISJOIN(MILLISECONDS) : 0.000000 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.108927 ADD_EQUALITY(MILLISECONDS) : 0.060797 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.019183 #CONJOIN_DISJUNCTIVE : 32 #RENAME_VARIABLES : 62 #UNFREEZE : 0 #CONJOIN : 62 #PROJECTAWAY : 64 #ADD_WEAK_EQUALITY : 4 #DISJOIN : 0 #RENAME_VARIABLES_DISJUNCTIVE : 62 #ADD_EQUALITY : 33 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 2 * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 1]: not all allocated memory was freed not all allocated memory was freed We found a FailurePath: - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.initErr0EnsuresViolation CFG has 4 procedures, 21 locations, 3 error locations. UNSAFE Result, 0.1s OverallTime, 1 OverallIterations, 1 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 3 NumberOfCodeBlocks, 3 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 1]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 1). Cancelled while BasicCegarLoop was analyzing trace of length 55 with TraceHistMax 37, while TraceCheckSpWp was constructing backward predicates, while PredicateComparison was comparing new predicate (quantifier-free) to 112 known predicates. - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.startErr0EnsuresViolation CFG has 4 procedures, 21 locations, 3 error locations. TIMEOUT Result, 55.7s OverallTime, 38 OverallIterations, 37 TraceHistogramMax, 2.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 595 SDtfs, 117 SDslu, 12907 SDs, 0 SdLazy, 2847 SolverSat, 135 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5891 GetRequests, 3566 SyntacticMatches, 72 SemanticMatches, 2253 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83344 ImplicationChecksByTransitivity, 32.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=55occurred in iteration=37, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 37 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 3.0s SatisfiabilityAnalysisTime, 45.9s InterpolantComputationTime, 3851 NumberOfCodeBlocks, 3851 NumberOfCodeBlocksAsserted, 499 NumberOfCheckSat, 6226 ConstructedInterpolants, 0 QuantifiedInterpolants, 1009008 SizeOfPredicates, 72 NumberOfNonLiveVariables, 8388 ConjunctsInSsa, 1548 ConjunctsInUnsatCore, 181 InterpolantComputations, 1 PerfectInterpolantSequences, 0/42180 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 20]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 20). Cancelled while IsEmpty was searching accepting run (input had 21 states). - StatisticsResult: Ultimate Automizer benchmark data for error location: mainErr0EnsuresViolation CFG has 4 procedures, 21 locations, 3 error locations. TIMEOUT Result, 0.0s OverallTime, 0 OverallIterations, 0 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, REUSE_STATISTICS: No data available RESULT: Ultimate proved your program to be incorrect! Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-Benchmark-0-2018-01-20_23-55-05-091.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-VPDomainBenchmark-0-2018-01-20_23-55-05-091.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-BenchmarkWithCounters-0-2018-01-20_23-55-05-091.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-0-2018-01-20_23-55-05-091.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-1-2018-01-20_23-55-05-091.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-2-2018-01-20_23-55-05-091.csv Completed graceful shutdown