java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_imprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 00:45:06,515 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 00:45:06,517 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 00:45:06,538 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 00:45:06,539 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 00:45:06,540 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 00:45:06,541 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 00:45:06,542 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 00:45:06,545 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 00:45:06,546 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 00:45:06,547 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 00:45:06,547 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 00:45:06,548 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 00:45:06,549 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 00:45:06,550 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 00:45:06,553 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 00:45:06,555 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 00:45:06,557 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 00:45:06,559 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 00:45:06,560 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 00:45:06,562 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 00:45:06,568 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_imprecise.epf [2018-01-21 00:45:06,578 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 00:45:06,578 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 00:45:06,579 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 00:45:06,579 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 00:45:06,580 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 00:45:06,580 INFO L133 SettingsManager]: * Deactivate Weak Equivalences=true [2018-01-21 00:45:06,580 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 00:45:06,580 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 00:45:06,581 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 00:45:06,581 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 00:45:06,581 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 00:45:06,581 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 00:45:06,582 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 00:45:06,582 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 00:45:06,582 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 00:45:06,582 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 00:45:06,582 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 00:45:06,583 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 00:45:06,583 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 00:45:06,583 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 00:45:06,583 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 00:45:06,583 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 00:45:06,583 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 00:45:06,584 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 00:45:06,584 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 00:45:06,584 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 00:45:06,584 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 00:45:06,584 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 00:45:06,585 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 00:45:06,585 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 00:45:06,585 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 00:45:06,585 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 00:45:06,585 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 00:45:06,585 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 00:45:06,586 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 00:45:06,586 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 00:45:06,586 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 00:45:06,587 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 00:45:06,587 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 00:45:06,622 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 00:45:06,634 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 00:45:06,638 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 00:45:06,640 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 00:45:06,640 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 00:45:06,641 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-21 00:45:06,763 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 00:45:06,767 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 00:45:06,768 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 00:45:06,768 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 00:45:06,773 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 00:45:06,773 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:45:06" (1/1) ... [2018-01-21 00:45:06,776 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1285ed85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:06, skipping insertion in model container [2018-01-21 00:45:06,776 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:45:06" (1/1) ... [2018-01-21 00:45:06,792 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:45:06,824 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:45:06,989 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:45:07,014 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:45:07,024 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07 WrapperNode [2018-01-21 00:45:07,024 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 00:45:07,025 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 00:45:07,025 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 00:45:07,025 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 00:45:07,037 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07" (1/1) ... [2018-01-21 00:45:07,038 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07" (1/1) ... [2018-01-21 00:45:07,046 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07" (1/1) ... [2018-01-21 00:45:07,046 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07" (1/1) ... [2018-01-21 00:45:07,049 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07" (1/1) ... [2018-01-21 00:45:07,053 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07" (1/1) ... [2018-01-21 00:45:07,055 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07" (1/1) ... [2018-01-21 00:45:07,057 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 00:45:07,058 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 00:45:07,058 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 00:45:07,058 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 00:45:07,059 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 00:45:07,118 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 00:45:07,119 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 00:45:07,119 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 00:45:07,119 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 00:45:07,119 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 00:45:07,119 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 00:45:07,119 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 00:45:07,120 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 00:45:07,120 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 00:45:07,120 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 00:45:07,120 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 00:45:07,120 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 00:45:07,120 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 00:45:07,292 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 00:45:07,293 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:45:07 BoogieIcfgContainer [2018-01-21 00:45:07,293 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 00:45:07,294 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 00:45:07,294 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 00:45:07,296 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 00:45:07,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 12:45:06" (1/3) ... [2018-01-21 00:45:07,297 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18292428 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:45:07, skipping insertion in model container [2018-01-21 00:45:07,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:45:07" (2/3) ... [2018-01-21 00:45:07,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18292428 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:45:07, skipping insertion in model container [2018-01-21 00:45:07,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:45:07" (3/3) ... [2018-01-21 00:45:07,299 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-21 00:45:07,307 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 00:45:07,313 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 00:45:07,369 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:45:07,370 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:45:07,370 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:45:07,370 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:45:07,370 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:45:07,370 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:45:07,370 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:45:07,371 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 00:45:07,371 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:45:07,393 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 00:45:07,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 00:45:07,400 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:07,402 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 00:45:07,402 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 00:45:07,406 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 00:45:07,408 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:07,451 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,451 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:07,451 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,451 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:07,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:45:07,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:45:07,508 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 00:45:07,515 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:45:07,522 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:45:07,522 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:45:07,522 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:45:07,522 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:45:07,522 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:45:07,523 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:45:07,523 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:45:07,523 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 00:45:07,523 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:45:07,525 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 00:45:07,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 00:45:07,527 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:07,527 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:07,527 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 00:45:07,527 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 00:45:07,528 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:07,529 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,529 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:07,529 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,530 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:07,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:07,561 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:07,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:45:07,599 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:45:07,600 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:45:07,600 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:45:07,602 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:45:07,617 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:45:07,617 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:45:07,619 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 00:45:07,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:07,641 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 00:45:07,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:45:07,642 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 00:45:07,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:07,649 INFO L225 Difference]: With dead ends: 72 [2018-01-21 00:45:07,649 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 00:45:07,653 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:45:07,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 00:45:07,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 00:45:07,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 00:45:07,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 00:45:07,736 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 00:45:07,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:07,737 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 00:45:07,737 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:45:07,737 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 00:45:07,737 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 00:45:07,739 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:45:07,739 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:45:07,739 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:45:07,739 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:45:07,739 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:45:07,740 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:45:07,740 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:45:07,740 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 00:45:07,740 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:45:07,741 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 00:45:07,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 00:45:07,742 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:07,742 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:07,742 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:07,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 00:45:07,743 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:07,743 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,744 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:07,744 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,744 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:07,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:07,752 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:07,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:45:07,763 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:45:07,763 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:45:07,763 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:45:07,763 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:45:07,763 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:45:07,763 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:45:07,764 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 00:45:07,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:07,768 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 00:45:07,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:45:07,768 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 00:45:07,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:07,770 INFO L225 Difference]: With dead ends: 72 [2018-01-21 00:45:07,771 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 00:45:07,771 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:45:07,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 00:45:07,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 00:45:07,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 00:45:07,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 00:45:07,781 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 00:45:07,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:07,781 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 00:45:07,781 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:45:07,781 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 00:45:07,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 00:45:07,782 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:07,782 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:07,782 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:07,782 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 00:45:07,782 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:07,783 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,783 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:07,783 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,783 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:07,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:07,792 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:07,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:45:07,828 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:45:07,828 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 00:45:07,828 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:45:07,829 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 00:45:07,829 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 00:45:07,830 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 00:45:07,830 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 00:45:07,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:07,885 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 00:45:07,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 00:45:07,886 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 00:45:07,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:07,889 INFO L225 Difference]: With dead ends: 66 [2018-01-21 00:45:07,890 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 00:45:07,890 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 00:45:07,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 00:45:07,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 00:45:07,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 00:45:07,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 00:45:07,901 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 00:45:07,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:07,901 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 00:45:07,901 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 00:45:07,902 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 00:45:07,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 00:45:07,903 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:07,903 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:07,903 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:07,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 00:45:07,904 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:07,904 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,905 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:07,905 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:07,905 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:07,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:07,923 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:07,974 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:45:07,974 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:07,975 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:07,976 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 00:45:07,978 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 00:45:08,029 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:45:08,029 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:45:08,323 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:45:08,325 INFO L268 AbstractInterpreter]: Visited 30 different actions 71 times. Merged at 14 different actions 27 times. Never widened. Found 3 fixpoints after 2 different actions. Largest state had 17 variables. [2018-01-21 00:45:08,333 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:45:08,334 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:08,334 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:08,344 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:08,344 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:45:08,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:08,377 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:08,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:45:08,451 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:08,694 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:45:08,715 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 00:45:08,715 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 9 [2018-01-21 00:45:08,715 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:45:08,716 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 00:45:08,716 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 00:45:08,716 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-01-21 00:45:08,717 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 00:45:08,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:08,824 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 00:45:08,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 00:45:08,825 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 00:45:08,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:08,826 INFO L225 Difference]: With dead ends: 80 [2018-01-21 00:45:08,826 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 00:45:08,827 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-01-21 00:45:08,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 00:45:08,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 00:45:08,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 00:45:08,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 00:45:08,832 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 00:45:08,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:08,833 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 00:45:08,833 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 00:45:08,833 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 00:45:08,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 00:45:08,833 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:08,834 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:08,834 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:08,834 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 00:45:08,834 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:08,835 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:08,835 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:08,835 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:08,835 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:08,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:08,852 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:08,895 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:45:08,895 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:08,895 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:08,895 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 00:45:08,896 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 00:45:08,898 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:45:08,898 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:45:09,186 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:45:09,186 INFO L268 AbstractInterpreter]: Visited 34 different actions 114 times. Merged at 22 different actions 55 times. Never widened. Found 9 fixpoints after 5 different actions. Largest state had 21 variables. [2018-01-21 00:45:09,189 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:45:09,190 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:09,190 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:09,202 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:09,202 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:45:09,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:09,229 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:09,269 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:45:09,269 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:09,454 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:45:09,488 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:09,488 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 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 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:09,493 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:09,521 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:45:09,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:09,559 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:09,580 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:45:09,580 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:09,645 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:45:09,646 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:09,647 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6, 4, 4] total 13 [2018-01-21 00:45:09,647 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:09,647 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 00:45:09,647 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 00:45:09,648 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2018-01-21 00:45:09,648 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-21 00:45:09,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:09,855 INFO L93 Difference]: Finished difference Result 111 states and 126 transitions. [2018-01-21 00:45:09,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 00:45:09,856 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 00:45:09,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:09,857 INFO L225 Difference]: With dead ends: 111 [2018-01-21 00:45:09,858 INFO L226 Difference]: Without dead ends: 75 [2018-01-21 00:45:09,859 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2018-01-21 00:45:09,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-21 00:45:09,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 57. [2018-01-21 00:45:09,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 00:45:09,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-21 00:45:09,868 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 36 [2018-01-21 00:45:09,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:09,868 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-21 00:45:09,868 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 00:45:09,868 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-21 00:45:09,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-01-21 00:45:09,871 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:09,871 INFO L322 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:09,872 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:09,872 INFO L82 PathProgramCache]: Analyzing trace with hash 936865683, now seen corresponding path program 2 times [2018-01-21 00:45:09,872 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:09,873 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:09,873 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:09,873 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:09,873 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:09,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:09,899 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:09,988 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 00:45:09,989 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:09,989 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:09,989 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:09,989 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:09,990 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:09,990 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:10,002 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:45:10,003 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:45:10,023 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:10,036 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:10,038 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:10,041 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:10,116 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:45:10,116 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:10,248 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:45:10,270 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:10,270 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:10,275 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:45:10,275 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:45:10,289 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:10,308 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:10,319 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:10,324 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:10,343 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 00:45:10,344 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:10,424 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 00:45:10,426 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:10,426 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 8, 5, 5] total 18 [2018-01-21 00:45:10,426 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:10,427 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 00:45:10,427 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 00:45:10,427 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2018-01-21 00:45:10,427 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 11 states. [2018-01-21 00:45:10,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:10,631 INFO L93 Difference]: Finished difference Result 163 states and 183 transitions. [2018-01-21 00:45:10,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 00:45:10,631 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 62 [2018-01-21 00:45:10,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:10,633 INFO L225 Difference]: With dead ends: 163 [2018-01-21 00:45:10,633 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 00:45:10,634 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 231 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2018-01-21 00:45:10,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 00:45:10,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 87. [2018-01-21 00:45:10,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-01-21 00:45:10,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 95 transitions. [2018-01-21 00:45:10,646 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 95 transitions. Word has length 62 [2018-01-21 00:45:10,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:10,647 INFO L432 AbstractCegarLoop]: Abstraction has 87 states and 95 transitions. [2018-01-21 00:45:10,647 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 00:45:10,647 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 95 transitions. [2018-01-21 00:45:10,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-01-21 00:45:10,649 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:10,650 INFO L322 BasicCegarLoop]: trace histogram [11, 8, 8, 8, 8, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:10,650 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:10,650 INFO L82 PathProgramCache]: Analyzing trace with hash -780821890, now seen corresponding path program 3 times [2018-01-21 00:45:10,650 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:10,651 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:10,651 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:45:10,651 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:10,652 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:10,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:10,681 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:10,774 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 00:45:10,775 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:10,775 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:10,775 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:10,775 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:10,775 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:10,775 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:10,781 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:45:10,781 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:45:10,792 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:10,799 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:10,807 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:10,823 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:10,827 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:10,831 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:10,880 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 00:45:10,881 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:11,035 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 00:45:11,056 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:11,056 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:11,059 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:45:11,059 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:45:11,074 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:11,082 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:11,095 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:11,114 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:11,124 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:11,129 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:11,147 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 00:45:11,148 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:11,212 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 00:45:11,214 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:11,214 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-21 00:45:11,214 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:11,214 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 00:45:11,215 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 00:45:11,215 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 00:45:11,215 INFO L87 Difference]: Start difference. First operand 87 states and 95 transitions. Second operand 7 states. [2018-01-21 00:45:11,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:11,272 INFO L93 Difference]: Finished difference Result 146 states and 163 transitions. [2018-01-21 00:45:11,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 00:45:11,273 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 93 [2018-01-21 00:45:11,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:11,274 INFO L225 Difference]: With dead ends: 146 [2018-01-21 00:45:11,275 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 00:45:11,275 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 00:45:11,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 00:45:11,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 96. [2018-01-21 00:45:11,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 00:45:11,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2018-01-21 00:45:11,287 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 93 [2018-01-21 00:45:11,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:11,288 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2018-01-21 00:45:11,288 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 00:45:11,288 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2018-01-21 00:45:11,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-01-21 00:45:11,290 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:11,290 INFO L322 BasicCegarLoop]: trace histogram [15, 11, 11, 11, 11, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:11,290 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:11,291 INFO L82 PathProgramCache]: Analyzing trace with hash -389182277, now seen corresponding path program 4 times [2018-01-21 00:45:11,291 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:11,291 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:11,292 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:45:11,292 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:11,292 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:11,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:11,319 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:11,433 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 399 trivial. 0 not checked. [2018-01-21 00:45:11,433 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:11,433 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:11,433 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:11,434 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:11,434 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:11,434 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:11,441 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:45:11,442 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:45:11,473 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:11,475 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:11,536 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-21 00:45:11,536 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:11,688 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-21 00:45:11,709 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:11,709 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:11,713 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:45:11,713 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:45:11,760 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:11,766 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:11,795 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-21 00:45:11,795 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:11,960 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-21 00:45:11,961 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:11,961 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10, 10, 10] total 19 [2018-01-21 00:45:11,961 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:11,962 INFO L409 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-01-21 00:45:11,962 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-01-21 00:45:11,962 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2018-01-21 00:45:11,962 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand 15 states. [2018-01-21 00:45:12,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:12,221 INFO L93 Difference]: Finished difference Result 256 states and 287 transitions. [2018-01-21 00:45:12,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 00:45:12,221 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 119 [2018-01-21 00:45:12,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:12,223 INFO L225 Difference]: With dead ends: 256 [2018-01-21 00:45:12,223 INFO L226 Difference]: Without dead ends: 194 [2018-01-21 00:45:12,224 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 454 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=151, Invalid=551, Unknown=0, NotChecked=0, Total=702 [2018-01-21 00:45:12,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-01-21 00:45:12,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 131. [2018-01-21 00:45:12,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 00:45:12,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 00:45:12,236 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 119 [2018-01-21 00:45:12,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:12,236 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 00:45:12,236 INFO L433 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-01-21 00:45:12,236 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 00:45:12,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-01-21 00:45:12,239 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:12,239 INFO L322 BasicCegarLoop]: trace histogram [22, 17, 17, 17, 17, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:12,239 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:12,239 INFO L82 PathProgramCache]: Analyzing trace with hash 349526166, now seen corresponding path program 5 times [2018-01-21 00:45:12,240 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:12,240 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:12,241 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:45:12,241 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:12,241 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:12,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:12,273 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:12,454 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-21 00:45:12,455 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:12,455 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:12,455 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:12,455 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:12,455 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:12,455 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:12,462 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:45:12,463 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:45:12,477 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:12,483 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:12,489 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:12,499 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:12,507 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:12,523 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:12,540 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:12,557 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:12,568 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:12,574 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:12,792 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 580 proven. 204 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2018-01-21 00:45:12,793 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:13,094 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 245 proven. 355 refuted. 0 times theorem prover too weak. 370 trivial. 0 not checked. [2018-01-21 00:45:13,116 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:13,116 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:13,119 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:45:13,120 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:45:13,133 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:13,137 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:13,145 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:13,155 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:13,171 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:13,195 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:13,228 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:13,266 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:13,284 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:13,290 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:13,377 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 607 proven. 208 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-01-21 00:45:13,378 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:13,598 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 277 proven. 376 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2018-01-21 00:45:13,599 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:13,600 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 15, 15, 15, 15] total 33 [2018-01-21 00:45:13,600 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:13,600 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 00:45:13,600 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 00:45:13,601 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=902, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 00:45:13,601 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 21 states. [2018-01-21 00:45:14,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:14,064 INFO L93 Difference]: Finished difference Result 307 states and 344 transitions. [2018-01-21 00:45:14,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 00:45:14,064 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 160 [2018-01-21 00:45:14,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:14,067 INFO L225 Difference]: With dead ends: 307 [2018-01-21 00:45:14,067 INFO L226 Difference]: Without dead ends: 233 [2018-01-21 00:45:14,069 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 605 SyntacticMatches, 15 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=416, Invalid=2034, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 00:45:14,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2018-01-21 00:45:14,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 171. [2018-01-21 00:45:14,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-01-21 00:45:14,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 190 transitions. [2018-01-21 00:45:14,087 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 190 transitions. Word has length 160 [2018-01-21 00:45:14,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:14,088 INFO L432 AbstractCegarLoop]: Abstraction has 171 states and 190 transitions. [2018-01-21 00:45:14,088 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 00:45:14,088 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 190 transitions. [2018-01-21 00:45:14,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-01-21 00:45:14,090 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:14,090 INFO L322 BasicCegarLoop]: trace histogram [30, 24, 24, 24, 24, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:14,090 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:14,090 INFO L82 PathProgramCache]: Analyzing trace with hash 896426349, now seen corresponding path program 6 times [2018-01-21 00:45:14,091 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:14,091 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:14,091 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:45:14,092 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:14,092 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:14,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:14,124 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:14,302 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 00:45:14,303 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:14,303 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:14,303 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:14,303 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:14,303 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:14,303 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:14,310 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:45:14,310 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:45:14,327 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,330 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,333 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,335 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,338 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,341 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,346 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,349 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,355 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,359 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,363 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,368 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,370 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:14,373 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:14,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 00:45:14,398 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:14,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 00:45:14,520 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:14,532 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:14,535 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:45:14,535 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:45:14,553 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,563 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,580 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,594 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,611 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,633 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,661 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,703 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,760 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:14,902 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:15,103 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:15,375 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:15,401 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:15,408 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:15,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 00:45:15,442 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:15,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 00:45:15,532 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:15,532 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 00:45:15,532 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:15,533 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 00:45:15,533 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 00:45:15,533 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:45:15,533 INFO L87 Difference]: Start difference. First operand 171 states and 190 transitions. Second operand 10 states. [2018-01-21 00:45:15,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:15,618 INFO L93 Difference]: Finished difference Result 257 states and 288 transitions. [2018-01-21 00:45:15,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 00:45:15,619 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 206 [2018-01-21 00:45:15,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:15,621 INFO L225 Difference]: With dead ends: 257 [2018-01-21 00:45:15,621 INFO L226 Difference]: Without dead ends: 220 [2018-01-21 00:45:15,621 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 816 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:45:15,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-21 00:45:15,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 180. [2018-01-21 00:45:15,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 00:45:15,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 201 transitions. [2018-01-21 00:45:15,634 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 201 transitions. Word has length 206 [2018-01-21 00:45:15,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:15,635 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 201 transitions. [2018-01-21 00:45:15,635 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 00:45:15,635 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 201 transitions. [2018-01-21 00:45:15,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-01-21 00:45:15,639 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:15,639 INFO L322 BasicCegarLoop]: trace histogram [36, 29, 29, 29, 29, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:15,639 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:15,639 INFO L82 PathProgramCache]: Analyzing trace with hash 927615722, now seen corresponding path program 7 times [2018-01-21 00:45:15,639 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:15,640 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:15,640 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:45:15,640 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:15,641 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:15,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:15,677 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:15,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-01-21 00:45:15,888 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:15,888 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:15,888 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:15,888 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:15,889 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:15,889 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:15,895 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:15,895 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:45:15,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:15,945 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:16,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 00:45:16,060 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:16,298 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 00:45:16,318 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:16,318 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:16,321 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:16,321 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:45:16,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:16,418 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:16,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 00:45:16,461 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:16,679 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 00:45:16,681 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:16,681 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 14, 14, 14] total 28 [2018-01-21 00:45:16,681 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:16,682 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 00:45:16,682 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 00:45:16,682 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2018-01-21 00:45:16,682 INFO L87 Difference]: Start difference. First operand 180 states and 201 transitions. Second operand 22 states. [2018-01-21 00:45:17,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:17,073 INFO L93 Difference]: Finished difference Result 460 states and 516 transitions. [2018-01-21 00:45:17,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 00:45:17,073 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 242 [2018-01-21 00:45:17,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:17,076 INFO L225 Difference]: With dead ends: 460 [2018-01-21 00:45:17,076 INFO L226 Difference]: Without dead ends: 365 [2018-01-21 00:45:17,077 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 936 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 00:45:17,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2018-01-21 00:45:17,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 225. [2018-01-21 00:45:17,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-01-21 00:45:17,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2018-01-21 00:45:17,093 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 242 [2018-01-21 00:45:17,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:17,093 INFO L432 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2018-01-21 00:45:17,093 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 00:45:17,093 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2018-01-21 00:45:17,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2018-01-21 00:45:17,098 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:17,098 INFO L322 BasicCegarLoop]: trace histogram [46, 38, 38, 38, 38, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:17,098 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:17,098 INFO L82 PathProgramCache]: Analyzing trace with hash -965692109, now seen corresponding path program 8 times [2018-01-21 00:45:17,098 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:17,099 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:17,099 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:45:17,100 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:17,100 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:17,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:17,152 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:17,370 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 4291 trivial. 0 not checked. [2018-01-21 00:45:17,371 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:17,371 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:17,371 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:17,371 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:17,371 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:17,371 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:17,376 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:45:17,377 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:45:17,403 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:17,436 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:17,441 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:17,448 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:17,720 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-21 00:45:17,720 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:18,130 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-21 00:45:18,152 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:18,152 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:18,155 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:45:18,155 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:45:18,179 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:18,234 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:18,278 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:18,289 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:18,356 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-21 00:45:18,357 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:18,593 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-21 00:45:18,594 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:18,595 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 16, 16, 16] total 32 [2018-01-21 00:45:18,595 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:18,595 INFO L409 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-01-21 00:45:18,595 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-01-21 00:45:18,596 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2018-01-21 00:45:18,596 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand 25 states. [2018-01-21 00:45:19,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:19,121 INFO L93 Difference]: Finished difference Result 570 states and 639 transitions. [2018-01-21 00:45:19,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 00:45:19,121 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 298 [2018-01-21 00:45:19,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:19,123 INFO L225 Difference]: With dead ends: 570 [2018-01-21 00:45:19,124 INFO L226 Difference]: Without dead ends: 463 [2018-01-21 00:45:19,125 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1216 GetRequests, 1155 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=405, Invalid=1757, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 00:45:19,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-21 00:45:19,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 275. [2018-01-21 00:45:19,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2018-01-21 00:45:19,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 309 transitions. [2018-01-21 00:45:19,147 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 309 transitions. Word has length 298 [2018-01-21 00:45:19,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:19,148 INFO L432 AbstractCegarLoop]: Abstraction has 275 states and 309 transitions. [2018-01-21 00:45:19,148 INFO L433 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-01-21 00:45:19,148 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 309 transitions. [2018-01-21 00:45:19,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2018-01-21 00:45:19,152 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:19,152 INFO L322 BasicCegarLoop]: trace histogram [57, 48, 48, 48, 48, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:19,152 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:19,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1850454344, now seen corresponding path program 9 times [2018-01-21 00:45:19,153 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:19,153 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:19,154 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:45:19,154 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:19,154 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:19,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:19,197 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:19,494 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 6720 trivial. 0 not checked. [2018-01-21 00:45:19,494 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:19,494 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:19,495 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:19,495 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:19,495 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:19,495 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:19,500 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:45:19,500 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:45:19,530 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:19,568 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:19,573 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:19,591 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:19,596 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:19,602 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:19,607 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:19,612 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:19,617 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:19,619 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:19,624 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:19,912 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 00:45:19,912 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:20,267 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 00:45:20,288 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:20,288 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:20,291 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:45:20,291 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:45:20,329 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:20,341 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:20,363 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:20,398 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:20,458 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:20,583 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:20,767 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:21,038 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:21,420 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:45:21,454 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:21,462 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:21,530 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 00:45:21,530 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:21,714 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 00:45:21,716 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:21,716 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13, 13, 13] total 32 [2018-01-21 00:45:21,716 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:21,717 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 00:45:21,717 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 00:45:21,717 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=728, Unknown=0, NotChecked=0, Total=992 [2018-01-21 00:45:21,717 INFO L87 Difference]: Start difference. First operand 275 states and 309 transitions. Second operand 21 states. [2018-01-21 00:45:22,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:22,069 INFO L93 Difference]: Finished difference Result 650 states and 740 transitions. [2018-01-21 00:45:22,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-21 00:45:22,069 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 359 [2018-01-21 00:45:22,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:22,072 INFO L225 Difference]: With dead ends: 650 [2018-01-21 00:45:22,072 INFO L226 Difference]: Without dead ends: 601 [2018-01-21 00:45:22,073 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1454 GetRequests, 1414 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=424, Invalid=1136, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 00:45:22,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2018-01-21 00:45:22,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 338. [2018-01-21 00:45:22,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2018-01-21 00:45:22,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 385 transitions. [2018-01-21 00:45:22,093 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 385 transitions. Word has length 359 [2018-01-21 00:45:22,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:22,093 INFO L432 AbstractCegarLoop]: Abstraction has 338 states and 385 transitions. [2018-01-21 00:45:22,093 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 00:45:22,093 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 385 transitions. [2018-01-21 00:45:22,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-21 00:45:22,095 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:22,095 INFO L322 BasicCegarLoop]: trace histogram [69, 59, 59, 59, 59, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:22,096 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:22,096 INFO L82 PathProgramCache]: Analyzing trace with hash -1164518591, now seen corresponding path program 10 times [2018-01-21 00:45:22,096 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:22,096 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:22,097 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:45:22,097 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:22,097 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:22,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:22,129 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:22,519 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 10005 trivial. 0 not checked. [2018-01-21 00:45:22,520 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:22,520 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:22,520 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:22,520 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:22,520 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:22,520 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:22,525 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:45:22,526 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:45:22,601 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:22,609 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:22,858 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-21 00:45:22,858 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:23,277 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-21 00:45:23,297 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:23,297 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:23,300 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:45:23,300 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:45:23,443 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:23,453 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:23,529 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-21 00:45:23,530 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:23,795 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-21 00:45:23,797 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:23,798 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20, 20, 20, 20] total 40 [2018-01-21 00:45:23,798 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:23,799 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 00:45:23,799 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 00:45:23,799 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=1273, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 00:45:23,799 INFO L87 Difference]: Start difference. First operand 338 states and 385 transitions. Second operand 31 states. [2018-01-21 00:45:25,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:25,257 INFO L93 Difference]: Finished difference Result 858 states and 980 transitions. [2018-01-21 00:45:25,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-21 00:45:25,257 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 425 [2018-01-21 00:45:25,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:25,262 INFO L225 Difference]: With dead ends: 858 [2018-01-21 00:45:25,262 INFO L226 Difference]: Without dead ends: 717 [2018-01-21 00:45:25,264 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1730 GetRequests, 1653 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=616, Invalid=2806, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 00:45:25,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2018-01-21 00:45:25,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 398. [2018-01-21 00:45:25,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2018-01-21 00:45:25,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 451 transitions. [2018-01-21 00:45:25,294 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 451 transitions. Word has length 425 [2018-01-21 00:45:25,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:25,295 INFO L432 AbstractCegarLoop]: Abstraction has 398 states and 451 transitions. [2018-01-21 00:45:25,295 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 00:45:25,295 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 451 transitions. [2018-01-21 00:45:25,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2018-01-21 00:45:25,299 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:25,299 INFO L322 BasicCegarLoop]: trace histogram [81, 70, 70, 70, 70, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:25,300 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:25,300 INFO L82 PathProgramCache]: Analyzing trace with hash -153318926, now seen corresponding path program 11 times [2018-01-21 00:45:25,300 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:25,301 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:25,301 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:45:25,301 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:25,301 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:25,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:25,345 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:25,849 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 13945 trivial. 0 not checked. [2018-01-21 00:45:25,850 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:25,850 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:25,850 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:25,850 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:25,850 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:25,850 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:25,859 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:45:25,860 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:45:25,884 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:25,888 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:25,892 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:25,899 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:25,906 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:25,914 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:25,921 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:25,929 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:25,936 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:25,942 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:25,950 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:26,259 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-21 00:45:26,259 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:27,087 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-21 00:45:27,118 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:27,118 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:27,121 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:45:27,121 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:45:27,154 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:27,164 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:27,184 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:27,218 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:27,284 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:27,429 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:27,549 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:27,693 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:27,849 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:45:27,880 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:27,889 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:28,017 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-21 00:45:28,017 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:28,343 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-21 00:45:28,346 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:45:28,346 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21, 21, 21, 21] total 44 [2018-01-21 00:45:28,346 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:45:28,347 INFO L409 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-01-21 00:45:28,347 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-01-21 00:45:28,347 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=1611, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 00:45:28,347 INFO L87 Difference]: Start difference. First operand 398 states and 451 transitions. Second operand 33 states. [2018-01-21 00:45:29,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:45:29,874 INFO L93 Difference]: Finished difference Result 969 states and 1094 transitions. [2018-01-21 00:45:29,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-21 00:45:29,888 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 491 [2018-01-21 00:45:29,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:45:29,892 INFO L225 Difference]: With dead ends: 969 [2018-01-21 00:45:29,892 INFO L226 Difference]: Without dead ends: 555 [2018-01-21 00:45:29,896 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2019 GetRequests, 1925 SyntacticMatches, 20 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1648 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=919, Invalid=4781, Unknown=0, NotChecked=0, Total=5700 [2018-01-21 00:45:29,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2018-01-21 00:45:29,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 399. [2018-01-21 00:45:29,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2018-01-21 00:45:29,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 444 transitions. [2018-01-21 00:45:29,926 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 444 transitions. Word has length 491 [2018-01-21 00:45:29,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:45:29,927 INFO L432 AbstractCegarLoop]: Abstraction has 399 states and 444 transitions. [2018-01-21 00:45:29,927 INFO L433 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-01-21 00:45:29,927 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 444 transitions. [2018-01-21 00:45:29,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 553 [2018-01-21 00:45:29,931 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:45:29,932 INFO L322 BasicCegarLoop]: trace histogram [92, 80, 80, 80, 80, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:45:29,932 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:45:29,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1811475687, now seen corresponding path program 12 times [2018-01-21 00:45:29,932 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:45:29,933 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:29,933 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:45:29,933 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:45:29,933 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:45:29,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:45:29,982 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:45:30,661 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 18116 trivial. 0 not checked. [2018-01-21 00:45:30,661 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:30,661 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:45:30,661 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:45:30,661 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:45:30,661 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:30,661 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:45:30,666 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:45:30,666 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:45:30,693 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,698 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,702 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,707 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,713 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,719 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,726 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,736 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,748 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,759 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,769 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,780 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,796 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,810 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,821 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,832 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,842 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,855 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,871 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,883 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,894 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:30,896 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:45:30,903 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:45:31,151 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-21 00:45:31,152 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:45:31,933 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-21 00:45:31,966 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:45:31,966 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:45:31,969 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:45:31,969 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:45:32,008 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:32,023 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:32,048 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:32,078 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:32,138 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:32,240 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:32,921 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:42,704 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:45:54,757 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... [2018-01-21 00:46:06,816 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown