java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:04:20,121 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:04:20,123 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:04:20,138 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:04:20,138 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:04:20,139 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:04:20,141 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:04:20,142 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:04:20,144 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:04:20,145 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:04:20,146 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:04:20,146 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:04:20,147 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:04:20,148 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:04:20,149 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:04:20,150 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:04:20,151 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:04:20,152 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:04:20,154 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:04:20,156 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:04:20,157 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:04:20,158 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:04:20,160 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:04:20,160 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:04:20,161 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:04:20,161 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:04:20,162 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:04:20,163 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:04:20,164 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:04:20,165 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:04:20,165 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:04:20,166 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-22 16:04:20,166 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-22 16:04:20,166 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-22 16:04:20,167 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-22 16:04:20,168 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-22 16:04:20,168 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:04:20,191 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:04:20,191 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:04:20,192 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:04:20,192 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:04:20,192 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:04:20,193 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:04:20,193 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:04:20,193 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:04:20,193 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:04:20,193 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:04:20,194 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:04:20,197 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:04:20,198 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:04:20,198 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:04:20,198 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:04:20,198 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:04:20,199 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:04:20,200 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:04:20,200 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:04:20,200 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:04:20,200 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:04:20,201 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:04:20,201 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:04:20,201 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:04:20,201 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:04:20,201 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:04:20,202 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:04:20,202 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:04:20,202 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:04:20,203 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:04:20,203 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:04:20,203 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:04:20,203 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:04:20,203 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:04:20,260 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:04:20,272 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:04:20,276 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:04:20,278 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:04:20,278 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:04:20,279 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-10-22 16:04:20,334 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4d0a69ba0/4dbea0128af548aa9622ad6de5e44152/FLAGa0aa496e4 [2018-10-22 16:04:20,811 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:04:20,812 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-10-22 16:04:20,818 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4d0a69ba0/4dbea0128af548aa9622ad6de5e44152/FLAGa0aa496e4 [2018-10-22 16:04:20,836 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4d0a69ba0/4dbea0128af548aa9622ad6de5e44152 [2018-10-22 16:04:20,849 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:04:20,851 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:04:20,852 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:04:20,852 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:04:20,856 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:04:20,857 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:04:20" (1/1) ... [2018-10-22 16:04:20,859 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b49186 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:20, skipping insertion in model container [2018-10-22 16:04:20,860 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:04:20" (1/1) ... [2018-10-22 16:04:20,870 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:04:20,887 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:04:21,104 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:04:21,109 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:04:21,131 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:04:21,148 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:04:21,149 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21 WrapperNode [2018-10-22 16:04:21,149 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:04:21,150 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:04:21,150 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:04:21,150 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:04:21,160 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... [2018-10-22 16:04:21,166 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... [2018-10-22 16:04:21,174 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:04:21,174 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:04:21,175 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:04:21,175 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:04:21,185 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... [2018-10-22 16:04:21,185 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... [2018-10-22 16:04:21,186 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... [2018-10-22 16:04:21,186 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... [2018-10-22 16:04:21,190 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... [2018-10-22 16:04:21,201 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... [2018-10-22 16:04:21,202 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... [2018-10-22 16:04:21,205 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:04:21,206 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:04:21,206 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:04:21,206 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:04:21,210 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:04:21,339 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:04:21,339 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:04:21,339 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:04:21,339 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:04:21,340 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:04:21,340 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:04:21,340 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:04:21,340 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:04:21,560 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:04:21,561 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:04:21 BoogieIcfgContainer [2018-10-22 16:04:21,561 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:04:21,562 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:04:21,562 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:04:21,565 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:04:21,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:04:20" (1/3) ... [2018-10-22 16:04:21,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57b3a5c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:04:21, skipping insertion in model container [2018-10-22 16:04:21,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:21" (2/3) ... [2018-10-22 16:04:21,567 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57b3a5c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:04:21, skipping insertion in model container [2018-10-22 16:04:21,567 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:04:21" (3/3) ... [2018-10-22 16:04:21,569 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_true-unreach-call1_true-termination.i [2018-10-22 16:04:21,578 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:04:21,587 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:04:21,605 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:04:21,645 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:04:21,646 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:04:21,646 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:04:21,646 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:04:21,647 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:04:21,647 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:04:21,647 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:04:21,647 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:04:21,647 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:04:21,666 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-22 16:04:21,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:04:21,679 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:21,680 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:21,683 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:21,689 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:21,690 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-22 16:04:21,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:21,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:21,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:21,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:21,749 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:21,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:21,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:21,810 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:04:21,810 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:04:21,810 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:04:21,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:04:21,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:04:21,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:04:21,828 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-22 16:04:21,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:21,850 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-22 16:04:21,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:04:21,851 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:04:21,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:21,860 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:04:21,860 INFO L226 Difference]: Without dead ends: 13 [2018-10-22 16:04:21,864 INFO L605 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 [2018-10-22 16:04:21,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-22 16:04:21,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-22 16:04:21,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-22 16:04:21,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-22 16:04:21,902 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-22 16:04:21,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:21,902 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-22 16:04:21,903 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:04:21,903 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-22 16:04:21,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:04:21,904 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:21,904 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:21,904 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:21,905 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:21,905 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-22 16:04:21,905 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:21,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:21,906 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:21,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:21,907 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:21,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:22,120 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:22,121 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:04:22,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:04:22,121 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:04:22,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:04:22,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:04:22,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:04:22,123 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-22 16:04:22,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:22,194 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-10-22 16:04:22,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:04:22,194 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:04:22,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:22,197 INFO L225 Difference]: With dead ends: 21 [2018-10-22 16:04:22,197 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:04:22,198 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:04:22,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:04:22,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-22 16:04:22,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-22 16:04:22,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-22 16:04:22,203 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-10-22 16:04:22,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:22,204 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-22 16:04:22,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:04:22,205 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-22 16:04:22,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:04:22,206 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:22,206 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:22,206 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:22,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:22,207 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-22 16:04:22,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:22,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:22,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:22,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:22,209 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:22,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:22,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:22,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:22,339 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:22,340 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-22 16:04:22,342 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:04:22,392 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:04:22,392 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:04:22,505 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:04:22,959 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:04:22,960 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-22 16:04:23,004 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:23,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:04:23,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:23,007 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:04:23,026 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:23,026 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:04:23,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:23,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:23,107 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:23,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:23,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:23,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:23,238 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:23,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:23,255 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:04:23,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:23,279 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:23,337 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:23,337 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:23,369 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (3)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:04:23,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:23,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:04:23,372 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:23,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:04:23,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:04:23,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:04:23,373 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-10-22 16:04:23,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:23,477 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-10-22 16:04:23,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:04:23,478 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-22 16:04:23,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:23,479 INFO L225 Difference]: With dead ends: 24 [2018-10-22 16:04:23,479 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 16:04:23,479 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:04:23,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 16:04:23,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-22 16:04:23,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:04:23,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-22 16:04:23,485 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-22 16:04:23,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:23,485 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-22 16:04:23,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:04:23,486 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-22 16:04:23,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:04:23,486 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:23,486 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:23,487 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:23,487 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:23,487 INFO L82 PathProgramCache]: Analyzing trace with hash -281914435, now seen corresponding path program 1 times [2018-10-22 16:04:23,487 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:23,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:23,488 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:23,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:23,489 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:23,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:23,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:23,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:23,668 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:23,669 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-22 16:04:23,669 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:04:23,671 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:04:23,671 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:04:23,685 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:04:23,987 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:04:23,987 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-22 16:04:24,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:24,022 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:04:24,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:24,022 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:24,041 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:24,041 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:04:24,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:24,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:24,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:24,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:24,405 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:24,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:24,429 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:24,446 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:24,446 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:04:24,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:24,466 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:24,498 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:24,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:24,515 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:24,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:24,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:04:24,518 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:24,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:04:24,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:04:24,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:04:24,519 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-10-22 16:04:24,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:24,583 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-10-22 16:04:24,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:04:24,584 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-22 16:04:24,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:24,585 INFO L225 Difference]: With dead ends: 26 [2018-10-22 16:04:24,585 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 16:04:24,586 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:04:24,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 16:04:24,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-10-22 16:04:24,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:04:24,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-22 16:04:24,591 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-22 16:04:24,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:24,591 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-22 16:04:24,591 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:04:24,591 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-22 16:04:24,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:04:24,592 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:24,592 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:24,593 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:24,593 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:24,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-22 16:04:24,593 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:24,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:24,594 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:24,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:24,595 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:24,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:24,743 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:24,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:24,744 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:24,745 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:24,745 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:24,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:24,745 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:24,754 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:04:24,754 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:24,767 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:04:24,767 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:24,769 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:24,780 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:24,780 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:25,007 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:25,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:25,030 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:25,047 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:04:25,047 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:25,072 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:04:25,073 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:25,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:25,123 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:25,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:25,177 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:25,179 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:25,179 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:04:25,179 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:25,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:04:25,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:04:25,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:04:25,181 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-10-22 16:04:25,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:25,287 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-10-22 16:04:25,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:04:25,287 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-22 16:04:25,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:25,289 INFO L225 Difference]: With dead ends: 29 [2018-10-22 16:04:25,289 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 16:04:25,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:04:25,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 16:04:25,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-10-22 16:04:25,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-22 16:04:25,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-10-22 16:04:25,294 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-10-22 16:04:25,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:25,295 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-10-22 16:04:25,295 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:04:25,295 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-10-22 16:04:25,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:04:25,296 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:25,296 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:25,296 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:25,296 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:25,296 INFO L82 PathProgramCache]: Analyzing trace with hash -849134272, now seen corresponding path program 1 times [2018-10-22 16:04:25,297 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:25,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:25,298 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:25,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:25,298 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:25,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:25,400 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:25,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:25,401 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:25,401 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-22 16:04:25,402 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:04:25,403 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:04:25,404 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:04:25,408 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:04:25,640 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:04:25,641 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 1 different actions 5 times. Found 11 fixpoints after 2 different actions. Largest state had 4 variables. [2018-10-22 16:04:25,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:25,676 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:04:25,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:25,676 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:25,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:25,695 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:04:25,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:25,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:25,958 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 5 [2018-10-22 16:04:25,976 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:25,976 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:26,125 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:26,147 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:04:26,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-22 16:04:26,148 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:04:26,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:04:26,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:04:26,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:04:26,149 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-10-22 16:04:26,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:26,162 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-10-22 16:04:26,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:04:26,164 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-22 16:04:26,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:26,165 INFO L225 Difference]: With dead ends: 35 [2018-10-22 16:04:26,165 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 16:04:26,166 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:04:26,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 16:04:26,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-22 16:04:26,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 16:04:26,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-10-22 16:04:26,173 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-10-22 16:04:26,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:26,173 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-10-22 16:04:26,173 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:04:26,174 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-10-22 16:04:26,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:04:26,174 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:26,175 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:26,175 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:26,175 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:26,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1277798652, now seen corresponding path program 2 times [2018-10-22 16:04:26,175 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:26,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:26,176 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:26,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:26,177 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:26,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:26,324 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:26,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:26,324 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:26,325 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:26,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:26,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:26,325 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:04:26,337 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:04:26,337 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:26,369 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:04:26,369 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:26,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:26,472 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:26,472 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:26,572 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:26,605 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:04:26,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-22 16:04:26,606 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:04:26,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:04:26,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:04:26,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:04:26,608 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-10-22 16:04:26,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:26,658 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-22 16:04:26,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:04:26,661 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-22 16:04:26,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:26,662 INFO L225 Difference]: With dead ends: 35 [2018-10-22 16:04:26,662 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 16:04:26,662 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:04:26,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 16:04:26,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-22 16:04:26,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 16:04:26,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-22 16:04:26,674 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-10-22 16:04:26,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:26,674 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-22 16:04:26,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:04:26,675 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-22 16:04:26,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:04:26,675 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:26,676 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:26,677 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:26,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:26,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1242161282, now seen corresponding path program 2 times [2018-10-22 16:04:26,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:26,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:26,678 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:26,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:26,679 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:26,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:26,842 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:26,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:26,843 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:26,843 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:26,844 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:26,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:26,844 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:26,852 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:04:26,852 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:26,881 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:04:26,881 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:26,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:26,896 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:26,896 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:27,019 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:27,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:27,041 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:27,061 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:04:27,061 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:27,083 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:04:27,083 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:27,086 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:27,099 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:27,099 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:27,133 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:27,135 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:27,135 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:04:27,135 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:27,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:04:27,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:04:27,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:04:27,136 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-22 16:04:27,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:27,182 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-10-22 16:04:27,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:04:27,183 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-22 16:04:27,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:27,184 INFO L225 Difference]: With dead ends: 35 [2018-10-22 16:04:27,184 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 16:04:27,185 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:04:27,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 16:04:27,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-22 16:04:27,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 16:04:27,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-22 16:04:27,190 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-10-22 16:04:27,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:27,191 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-22 16:04:27,191 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:04:27,191 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-22 16:04:27,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:04:27,192 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:27,192 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:27,192 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:27,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:27,192 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-10-22 16:04:27,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:27,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:27,194 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:27,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:27,194 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:27,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:27,623 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:27,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:27,624 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:27,624 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:27,624 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:27,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:27,625 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:27,640 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:04:27,640 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:04:27,653 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:04:27,653 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:27,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:27,676 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:27,676 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:27,932 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:27,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:27,953 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:27,968 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:04:27,968 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:04:28,028 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:04:28,028 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:28,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:28,046 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:28,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:28,057 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:28,059 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:28,059 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:04:28,059 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:28,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:04:28,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:04:28,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:04:28,060 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-10-22 16:04:28,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:28,154 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-10-22 16:04:28,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:04:28,157 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-22 16:04:28,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:28,158 INFO L225 Difference]: With dead ends: 38 [2018-10-22 16:04:28,158 INFO L226 Difference]: Without dead ends: 33 [2018-10-22 16:04:28,158 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:04:28,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-22 16:04:28,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-22 16:04:28,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 16:04:28,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-10-22 16:04:28,164 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-10-22 16:04:28,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:28,165 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-10-22 16:04:28,165 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:04:28,165 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-10-22 16:04:28,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:04:28,166 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:28,166 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:28,166 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:28,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:28,167 INFO L82 PathProgramCache]: Analyzing trace with hash 821178397, now seen corresponding path program 3 times [2018-10-22 16:04:28,167 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:28,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:28,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:28,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:28,168 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:28,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:28,284 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:28,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:28,285 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:28,285 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:28,285 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:28,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:28,286 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:28,297 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:04:28,297 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:04:40,329 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:04:40,329 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:40,334 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:40,741 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:04:40,741 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:46,951 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 6 [2018-10-22 16:04:53,233 WARN L179 SmtUtils]: Spent 4.11 s on a formula simplification. DAG size of input: 43 DAG size of output: 21 [2018-10-22 16:04:53,241 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:04:53,261 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:04:53,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [6] total 16 [2018-10-22 16:04:53,261 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:04:53,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:04:53,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:04:53,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=188, Unknown=3, NotChecked=0, Total=240 [2018-10-22 16:04:53,263 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 7 states. [2018-10-22 16:04:55,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:55,366 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-10-22 16:04:55,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:04:55,367 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2018-10-22 16:04:55,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:55,368 INFO L225 Difference]: With dead ends: 37 [2018-10-22 16:04:55,368 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 16:04:55,369 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=61, Invalid=241, Unknown=4, NotChecked=0, Total=306 [2018-10-22 16:04:55,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 16:04:55,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-22 16:04:55,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 16:04:55,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 16:04:55,374 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-22 16:04:55,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:55,374 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 16:04:55,374 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:04:55,374 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 16:04:55,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:04:55,375 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:55,375 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:55,375 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:55,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:55,375 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-10-22 16:04:55,376 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:55,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:55,376 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:55,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:55,377 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:55,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:55,748 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:55,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:55,749 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:55,749 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:55,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:55,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:55,750 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:04:55,757 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:04:55,757 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:04:55,766 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:04:55,766 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:55,769 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:55,797 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:55,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:56,380 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:56,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:56,400 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 16 with cvc4nyu --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 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:56,416 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:04:56,416 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:04:56,437 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:04:56,438 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:56,441 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:56,449 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:56,450 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:56,512 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:56,514 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:56,514 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 16:04:56,514 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:56,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:04:56,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:04:56,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:04:56,515 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 7 states. [2018-10-22 16:04:56,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:56,607 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-22 16:04:56,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:04:56,609 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-22 16:04:56,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:56,610 INFO L225 Difference]: With dead ends: 33 [2018-10-22 16:04:56,610 INFO L226 Difference]: Without dead ends: 28 [2018-10-22 16:04:56,611 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 85 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:04:56,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-22 16:04:56,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-22 16:04:56,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-22 16:04:56,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-22 16:04:56,615 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-22 16:04:56,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:56,615 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-22 16:04:56,616 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:04:56,616 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-22 16:04:56,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 16:04:56,617 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:56,617 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:56,617 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:56,617 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:56,617 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-10-22 16:04:56,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:56,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:56,618 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:56,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:56,619 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:56,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:56,857 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:56,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:56,858 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:56,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:56,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:56,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:56,858 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:04:56,866 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:56,866 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:56,890 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:04:56,891 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:56,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:56,916 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:56,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:57,401 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:57,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:57,421 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 18 with cvc4nyu --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 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:57,436 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:57,436 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:57,495 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:04:57,496 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:57,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:57,546 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:57,546 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:57,596 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:57,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:57,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:04:57,599 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:57,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:04:57,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:04:57,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:04:57,601 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 8 states. [2018-10-22 16:04:57,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:57,736 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-22 16:04:57,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:04:57,737 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-22 16:04:57,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:57,738 INFO L225 Difference]: With dead ends: 36 [2018-10-22 16:04:57,738 INFO L226 Difference]: Without dead ends: 31 [2018-10-22 16:04:57,739 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:04:57,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-22 16:04:57,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-22 16:04:57,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:04:57,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-22 16:04:57,743 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-22 16:04:57,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:57,744 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-22 16:04:57,744 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:04:57,744 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-22 16:04:57,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:04:57,745 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:57,745 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:57,745 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:57,746 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:57,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-10-22 16:04:57,746 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:57,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:57,747 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:57,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:57,747 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:57,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:57,964 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:57,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:57,965 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:57,965 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:57,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:57,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:57,966 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:04:57,998 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:04:57,999 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:04:58,049 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:04:58,049 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:58,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:58,072 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:04:58,072 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:00,412 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:00,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:00,432 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 20 with cvc4nyu --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 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:00,447 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:00,447 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:05:00,609 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:05:00,609 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:00,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:00,666 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:00,666 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:00,721 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:00,724 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:00,724 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-10-22 16:05:00,724 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:00,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:05:00,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:05:00,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=161, Unknown=1, NotChecked=0, Total=240 [2018-10-22 16:05:00,725 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-10-22 16:05:00,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:00,956 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-22 16:05:00,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:05:00,957 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-22 16:05:00,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:00,958 INFO L225 Difference]: With dead ends: 39 [2018-10-22 16:05:00,958 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 16:05:00,959 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=78, Invalid=161, Unknown=1, NotChecked=0, Total=240 [2018-10-22 16:05:00,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 16:05:00,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-22 16:05:00,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-22 16:05:00,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-22 16:05:00,964 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-22 16:05:00,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:00,964 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-22 16:05:00,964 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:05:00,964 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-22 16:05:00,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 16:05:00,965 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:00,965 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:00,965 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:00,966 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:00,966 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-10-22 16:05:00,966 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:00,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:00,967 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:00,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:00,967 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:00,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:01,154 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:01,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:01,154 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:01,155 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:01,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:01,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:01,155 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:05:01,167 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:01,167 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:01,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:01,190 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:01,235 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:01,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:02,900 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:02,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:02,920 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 22 with cvc4nyu --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 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:02,939 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:02,939 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:02,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:02,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:03,002 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:03,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:03,044 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:03,046 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:03,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:05:03,047 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:03,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:05:03,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:05:03,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:05:03,048 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-10-22 16:05:03,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:03,320 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-22 16:05:03,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:05:03,321 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-22 16:05:03,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:03,322 INFO L225 Difference]: With dead ends: 42 [2018-10-22 16:05:03,322 INFO L226 Difference]: Without dead ends: 37 [2018-10-22 16:05:03,323 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:05:03,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-22 16:05:03,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-22 16:05:03,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 16:05:03,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-22 16:05:03,329 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-22 16:05:03,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:03,329 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-22 16:05:03,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:05:03,329 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-22 16:05:03,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 16:05:03,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:03,331 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:03,331 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:03,331 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:03,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-10-22 16:05:03,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:03,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:03,332 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:03,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:03,332 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:03,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:03,510 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:03,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:03,510 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:03,511 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:03,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:03,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:03,511 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:05:03,518 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:03,518 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:03,530 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:03,530 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:03,531 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:03,546 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:03,546 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:07,185 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:07,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:07,206 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 24 with cvc4nyu --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 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:07,221 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:07,222 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:07,261 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:07,261 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:07,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:07,277 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:07,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:07,284 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:07,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:07,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:05:07,286 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:07,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:05:07,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:05:07,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:05:07,287 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-10-22 16:05:07,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:07,544 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-22 16:05:07,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:05:07,545 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-22 16:05:07,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:07,545 INFO L225 Difference]: With dead ends: 45 [2018-10-22 16:05:07,545 INFO L226 Difference]: Without dead ends: 40 [2018-10-22 16:05:07,546 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 129 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:05:07,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-22 16:05:07,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-22 16:05:07,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-22 16:05:07,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-22 16:05:07,551 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-22 16:05:07,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:07,551 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-22 16:05:07,551 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:05:07,551 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-22 16:05:07,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-22 16:05:07,552 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:07,552 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:07,552 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:07,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:07,553 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-10-22 16:05:07,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:07,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:07,554 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:07,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:07,554 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:07,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:07,912 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:07,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:07,913 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:07,913 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:07,913 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:07,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:07,913 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:05:07,921 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:07,921 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:08,760 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:05:08,761 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:08,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:08,801 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:08,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:10,662 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:10,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:10,682 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 26 with cvc4nyu --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 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:10,697 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:10,697 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:10,907 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:05:10,907 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:10,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:10,935 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:10,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:10,962 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:10,964 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:10,964 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-10-22 16:05:10,965 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:10,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:05:10,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:05:10,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:05:10,966 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-10-22 16:05:11,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:11,136 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-22 16:05:11,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:05:11,139 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-22 16:05:11,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:11,139 INFO L225 Difference]: With dead ends: 48 [2018-10-22 16:05:11,139 INFO L226 Difference]: Without dead ends: 43 [2018-10-22 16:05:11,140 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 140 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:05:11,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-22 16:05:11,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-22 16:05:11,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 16:05:11,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-22 16:05:11,145 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-22 16:05:11,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:11,145 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-22 16:05:11,145 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:05:11,145 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-22 16:05:11,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 16:05:11,146 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:11,146 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:11,146 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:11,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:11,146 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-10-22 16:05:11,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:11,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:11,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:11,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:11,148 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:11,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:11,327 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:11,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:11,327 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:11,327 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:11,328 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:11,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:11,328 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:11,342 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:11,342 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:11,378 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:11,378 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:11,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:11,403 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:11,404 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:15,941 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:15,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:15,964 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 28 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:15,981 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:15,981 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:16,015 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:16,015 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:16,018 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:16,027 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:16,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:16,046 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:16,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:16,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-22 16:05:16,055 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:16,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:05:16,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:05:16,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:05:16,056 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-10-22 16:05:16,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:16,344 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-22 16:05:16,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:05:16,344 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-22 16:05:16,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:16,345 INFO L225 Difference]: With dead ends: 51 [2018-10-22 16:05:16,345 INFO L226 Difference]: Without dead ends: 46 [2018-10-22 16:05:16,346 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 151 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:05:16,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-22 16:05:16,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-22 16:05:16,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-22 16:05:16,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-22 16:05:16,352 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-22 16:05:16,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:16,353 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-22 16:05:16,353 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:05:16,353 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-22 16:05:16,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-22 16:05:16,354 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:16,354 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:16,354 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:16,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:16,355 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-10-22 16:05:16,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:16,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:16,355 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:16,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:16,356 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:16,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:17,084 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:17,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:17,084 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:17,084 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:17,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:17,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:17,084 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:17,093 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:17,093 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:17,633 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:05:17,633 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:17,640 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:17,648 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:17,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:22,769 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:22,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:22,790 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 30 with cvc4nyu --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 30 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:22,814 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:22,814 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:22,997 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:05:22,997 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:23,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:23,012 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:23,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:23,068 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:23,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:23,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-22 16:05:23,071 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:23,071 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:05:23,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:05:23,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:05:23,072 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-10-22 16:05:23,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:23,372 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-22 16:05:23,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:05:23,372 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-22 16:05:23,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:23,373 INFO L225 Difference]: With dead ends: 54 [2018-10-22 16:05:23,373 INFO L226 Difference]: Without dead ends: 49 [2018-10-22 16:05:23,374 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 162 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:05:23,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-22 16:05:23,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-22 16:05:23,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 16:05:23,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-22 16:05:23,380 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-22 16:05:23,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:23,381 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-22 16:05:23,381 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:05:23,381 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-22 16:05:23,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 16:05:23,381 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:23,382 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:23,382 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:23,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:23,382 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-10-22 16:05:23,382 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:23,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:23,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:23,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:23,383 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:23,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:23,644 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:23,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:23,645 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:23,645 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:23,645 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:23,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:23,645 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:23,654 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:23,654 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:05:26,318 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:05:26,319 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:26,322 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:26,344 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:26,344 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:32,946 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:32,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:32,966 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 32 with cvc4nyu --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 32 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:32,982 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:32,982 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:05:33,329 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:05:33,329 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:33,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:33,361 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:33,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:33,387 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:33,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:33,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-22 16:05:33,389 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:33,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:05:33,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:05:33,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:05:33,391 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-10-22 16:05:33,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:33,729 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-22 16:05:33,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:05:33,730 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-22 16:05:33,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:33,731 INFO L225 Difference]: With dead ends: 57 [2018-10-22 16:05:33,731 INFO L226 Difference]: Without dead ends: 52 [2018-10-22 16:05:33,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 173 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:05:33,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-22 16:05:33,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-22 16:05:33,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-22 16:05:33,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-22 16:05:33,737 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-22 16:05:33,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:33,737 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-22 16:05:33,737 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:05:33,737 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-22 16:05:33,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-22 16:05:33,738 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:33,738 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:33,738 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:33,739 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:33,739 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-10-22 16:05:33,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:33,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:33,740 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:33,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:33,740 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:33,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:34,410 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:34,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:34,410 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:34,410 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:34,411 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:34,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:34,411 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:34,418 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:34,418 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:34,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:34,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:34,455 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:34,455 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:39,532 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:39,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:39,552 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 34 with cvc4nyu --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 34 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:39,568 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:39,568 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:39,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:39,611 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:39,637 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:39,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:39,699 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:39,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:39,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:05:39,702 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:39,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:05:39,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:05:39,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:05:39,703 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-10-22 16:05:40,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:40,207 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-22 16:05:40,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:05:40,207 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-22 16:05:40,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:40,209 INFO L225 Difference]: With dead ends: 60 [2018-10-22 16:05:40,209 INFO L226 Difference]: Without dead ends: 55 [2018-10-22 16:05:40,210 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:05:40,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-22 16:05:40,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-22 16:05:40,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-22 16:05:40,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-22 16:05:40,214 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-22 16:05:40,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:40,215 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-22 16:05:40,215 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:05:40,215 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-22 16:05:40,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 16:05:40,216 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:40,216 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:40,216 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:40,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:40,216 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-10-22 16:05:40,217 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:40,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:40,217 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:40,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:40,218 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:40,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:40,470 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:40,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:40,470 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:40,470 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:40,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:40,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:40,471 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:40,478 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:40,478 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:40,493 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:40,494 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:40,495 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:40,510 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:40,510 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:49,442 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 298 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:49,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:49,463 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 36 with cvc4nyu --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 36 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:49,478 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:49,478 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:49,526 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:49,527 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:49,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:49,555 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:49,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:49,606 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 298 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:49,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:49,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-22 16:05:49,609 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:49,610 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:05:49,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:05:49,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-22 16:05:49,611 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-10-22 16:05:50,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:50,142 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-22 16:05:50,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:05:50,145 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-22 16:05:50,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:50,146 INFO L225 Difference]: With dead ends: 63 [2018-10-22 16:05:50,146 INFO L226 Difference]: Without dead ends: 58 [2018-10-22 16:05:50,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 195 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-22 16:05:50,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-22 16:05:50,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-22 16:05:50,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-22 16:05:50,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-22 16:05:50,151 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-22 16:05:50,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:50,151 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-22 16:05:50,152 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:05:50,152 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-22 16:05:50,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-22 16:05:50,152 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:50,153 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:50,153 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:50,153 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:50,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-10-22 16:05:50,153 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:50,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:50,154 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:50,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:50,154 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:50,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:50,465 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:50,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:50,465 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:50,465 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:50,465 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:50,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:50,466 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:50,474 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:50,474 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:10,323 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:07:10,324 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:10,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:11,080 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:11,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:12,104 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:07:13,914 WARN L179 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:07:14,366 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:07:14,763 WARN L179 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:07:16,628 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:07:17,362 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:17,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:17,367 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 38 with cvc4nyu --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 38 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:17,383 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:17,383 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:17,910 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:07:17,911 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:17,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:17,932 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:17,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:30,397 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:30,399 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:30,399 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 19, 18, 18] total 47 [2018-10-22 16:07:30,399 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:30,399 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:07:30,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:07:30,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=1516, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:07:30,401 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-10-22 16:07:31,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:31,161 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-22 16:07:31,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:07:31,163 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-22 16:07:31,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:31,165 INFO L225 Difference]: With dead ends: 66 [2018-10-22 16:07:31,165 INFO L226 Difference]: Without dead ends: 61 [2018-10-22 16:07:31,167 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 192 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=646, Invalid=1516, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:07:31,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-22 16:07:31,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-22 16:07:31,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:07:31,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-22 16:07:31,174 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-22 16:07:31,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:31,174 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-22 16:07:31,174 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:07:31,174 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-22 16:07:31,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-22 16:07:31,175 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:31,175 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:31,175 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:31,175 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:31,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-10-22 16:07:31,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:31,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:31,176 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:31,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:31,177 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:31,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:31,502 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:31,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:31,502 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:31,503 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:31,503 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:31,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:31,503 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:31,510 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:31,511 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:31,531 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:31,531 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:31,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:31,548 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:31,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:40,600 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 389 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:40,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:40,620 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 40 with cvc4nyu --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 40 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:40,645 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:40,645 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:40,692 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:40,692 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:40,696 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:40,709 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:40,709 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:40,717 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 389 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:40,719 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:40,719 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-22 16:07:40,719 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:40,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:07:40,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:07:40,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=901, Unknown=1, NotChecked=0, Total=1260 [2018-10-22 16:07:40,720 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-10-22 16:07:41,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:41,312 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-22 16:07:41,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:07:41,313 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-22 16:07:41,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:41,313 INFO L225 Difference]: With dead ends: 69 [2018-10-22 16:07:41,314 INFO L226 Difference]: Without dead ends: 64 [2018-10-22 16:07:41,314 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 217 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=358, Invalid=901, Unknown=1, NotChecked=0, Total=1260 [2018-10-22 16:07:41,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-22 16:07:41,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-22 16:07:41,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-22 16:07:41,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-22 16:07:41,319 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-22 16:07:41,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:41,319 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-22 16:07:41,319 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:07:41,320 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-22 16:07:41,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-22 16:07:41,320 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:41,320 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:41,321 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:41,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:41,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-10-22 16:07:41,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:41,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:41,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:41,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:41,322 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:41,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:41,713 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:41,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:41,714 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:41,714 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:41,714 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:41,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:41,714 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:41,724 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:07:41,724 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:07,628 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:08:07,628 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:07,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:07,687 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:07,687 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:19,888 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 439 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:19,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:19,911 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 42 with cvc4nyu --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 42 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:19,929 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:19,929 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:20,363 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:08:20,363 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:20,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:20,408 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:20,408 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:20,460 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 439 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:20,461 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:20,461 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-10-22 16:08:20,461 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:20,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:08:20,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:08:20,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1008, Unknown=1, NotChecked=0, Total=1406 [2018-10-22 16:08:20,463 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-10-22 16:08:21,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:21,096 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-22 16:08:21,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:08:21,096 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-22 16:08:21,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:21,097 INFO L225 Difference]: With dead ends: 72 [2018-10-22 16:08:21,097 INFO L226 Difference]: Without dead ends: 67 [2018-10-22 16:08:21,098 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 228 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=397, Invalid=1008, Unknown=1, NotChecked=0, Total=1406 [2018-10-22 16:08:21,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-22 16:08:21,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-22 16:08:21,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-22 16:08:21,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-22 16:08:21,103 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-22 16:08:21,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:21,104 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-22 16:08:21,104 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:08:21,104 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-22 16:08:21,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-22 16:08:21,104 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:21,104 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:21,105 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:21,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:21,105 INFO L82 PathProgramCache]: Analyzing trace with hash 595615166, now seen corresponding path program 18 times [2018-10-22 16:08:21,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:21,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:21,105 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:21,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:21,106 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:21,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:22,664 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:22,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:22,665 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:22,665 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:22,665 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:22,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:22,665 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:22,672 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:22,673 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:27,363 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-22 16:08:27,363 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:27,374 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:27,396 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:27,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:40,079 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:40,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:40,100 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 44 with cvc4nyu --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 44 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:40,115 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:40,115 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:40,869 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-22 16:08:40,869 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:40,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:40,884 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:40,885 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:40,902 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:40,904 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:40,904 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 40 [2018-10-22 16:08:40,904 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:40,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:08:40,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:08:40,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:08:40,906 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 21 states. [2018-10-22 16:08:41,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:41,428 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-22 16:08:41,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:08:41,429 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-22 16:08:41,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:41,430 INFO L225 Difference]: With dead ends: 75 [2018-10-22 16:08:41,430 INFO L226 Difference]: Without dead ends: 70 [2018-10-22 16:08:41,431 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 239 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:08:41,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-22 16:08:41,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-22 16:08:41,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-22 16:08:41,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-22 16:08:41,436 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-22 16:08:41,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:41,436 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-22 16:08:41,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:08:41,436 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-22 16:08:41,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-22 16:08:41,437 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:41,437 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:41,437 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:41,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:41,438 INFO L82 PathProgramCache]: Analyzing trace with hash 296211291, now seen corresponding path program 19 times [2018-10-22 16:08:41,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:41,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:41,439 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:41,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:41,439 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:41,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:42,885 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:42,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:42,886 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:42,886 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:42,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:42,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:42,886 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:42,894 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:42,894 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:42,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:42,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:42,940 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:42,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:55,184 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 548 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:55,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:55,204 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 46 with cvc4nyu --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 46 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:55,219 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:55,219 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:55,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:55,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:55,308 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:55,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:55,332 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 548 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:55,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:55,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 42 [2018-10-22 16:08:55,334 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:55,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:08:55,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:08:55,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1239, Unknown=2, NotChecked=0, Total=1722 [2018-10-22 16:08:55,335 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 22 states. [2018-10-22 16:08:55,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:55,896 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-22 16:08:55,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:08:55,897 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-22 16:08:55,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:55,898 INFO L225 Difference]: With dead ends: 78 [2018-10-22 16:08:55,898 INFO L226 Difference]: Without dead ends: 73 [2018-10-22 16:08:55,899 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 250 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=481, Invalid=1239, Unknown=2, NotChecked=0, Total=1722 [2018-10-22 16:08:55,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-22 16:08:55,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-22 16:08:55,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-22 16:08:55,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-22 16:08:55,902 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-22 16:08:55,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:55,902 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-22 16:08:55,902 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:08:55,902 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-22 16:08:55,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-22 16:08:55,903 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:55,904 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:55,904 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:55,904 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:55,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1402444958, now seen corresponding path program 20 times [2018-10-22 16:08:55,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:55,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:55,905 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:55,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:55,905 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:55,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:56,272 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:56,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,272 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:56,272 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:56,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:56,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,273 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:56,280 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:56,280 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:56,303 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:56,303 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:56,304 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:56,334 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:56,335 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-22 16:08:58,726 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-22 16:08:58,927 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:58,927 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:08:58,932 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:08:58,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:08:58 BoogieIcfgContainer [2018-10-22 16:08:58,932 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:08:58,933 INFO L168 Benchmark]: Toolchain (without parser) took 278083.37 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 944.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -767.7 MB). Peak memory consumption was 176.5 MB. Max. memory is 7.1 GB. [2018-10-22 16:08:58,934 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:08:58,934 INFO L168 Benchmark]: CACSL2BoogieTranslator took 297.80 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 16:08:58,935 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.11 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:08:58,935 INFO L168 Benchmark]: Boogie Preprocessor took 31.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:08:58,936 INFO L168 Benchmark]: RCFGBuilder took 354.94 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 712.0 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -751.4 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-10-22 16:08:58,936 INFO L168 Benchmark]: TraceAbstraction took 277370.50 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 232.3 MB). Free memory was 2.1 GB in the beginning and 2.2 GB in the end (delta: -26.9 MB). Peak memory consumption was 205.3 MB. Max. memory is 7.1 GB. [2018-10-22 16:08:58,939 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 297.80 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.11 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 31.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 354.94 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 712.0 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -751.4 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 277370.50 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 232.3 MB). Free memory was 2.1 GB in the beginning and 2.2 GB in the end (delta: -26.9 MB). Peak memory consumption was 205.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 72 with TraceHistMax 21,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 28 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. TIMEOUT Result, 277.2s OverallTime, 27 OverallIterations, 21 TraceHistogramMax, 8.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 497 SDtfs, 28 SDslu, 4456 SDs, 0 SdLazy, 6284 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3607 GetRequests, 3071 SyntacticMatches, 70 SemanticMatches, 466 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 130.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.2s AbstIntTime, 3 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 26 MinimizatonAttempts, 28 StatesRemovedByMinimization, 24 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 130.2s SatisfiabilityAnalysisTime, 131.9s InterpolantComputationTime, 2559 NumberOfCodeBlocks, 2556 NumberOfCodeBlocksAsserted, 280 NumberOfCheckSat, 4117 ConstructedInterpolants, 1 QuantifiedInterpolants, 1088107 SizeOfPredicates, 50 NumberOfNonLiveVariables, 3467 ConjunctsInSsa, 914 ConjunctsInUnsatCore, 116 InterpolantComputations, 8 PerfectInterpolantSequences, 58/19132 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown