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-crafted/simple_array_index_value_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:14:20,145 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:14:20,147 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:14:20,159 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:14:20,159 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:14:20,160 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:14:20,161 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:14:20,163 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:14:20,164 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:14:20,165 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:14:20,166 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:14:20,166 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:14:20,167 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:14:20,168 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:14:20,169 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:14:20,170 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:14:20,171 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:14:20,173 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:14:20,174 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:14:20,176 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:14:20,177 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:14:20,178 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:14:20,180 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 12:14:20,189 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 [2018-10-24 12:14:20,213 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:14:20,213 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:14:20,215 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:14:20,215 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:14:20,215 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:14:20,215 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:14:20,216 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:14:20,216 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:14:20,216 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:14:20,217 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:14:20,217 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:14:20,217 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:14:20,218 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:14:20,218 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:14:20,218 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:14:20,218 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:14:20,218 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:14:20,219 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:14:20,220 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:14:20,221 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:14:20,221 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:14:20,221 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:14:20,221 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:14:20,221 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:14:20,221 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:14:20,222 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:14:20,222 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:14:20,222 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:14:20,223 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:14:20,223 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:14:20,223 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:14:20,223 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:14:20,223 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:14:20,223 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:14:20,268 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:14:20,282 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:14:20,289 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:14:20,290 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:14:20,291 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:14:20,291 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-24 12:14:20,345 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2321003ad/8ca3c1dc34634649a2fb7c51e45f5ead/FLAG6dc3fd22d [2018-10-24 12:14:20,818 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:14:20,819 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-24 12:14:20,825 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2321003ad/8ca3c1dc34634649a2fb7c51e45f5ead/FLAG6dc3fd22d [2018-10-24 12:14:20,848 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2321003ad/8ca3c1dc34634649a2fb7c51e45f5ead [2018-10-24 12:14:20,861 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:14:20,862 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:14:20,864 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:14:20,864 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:14:20,869 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:14:20,870 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:14:20" (1/1) ... [2018-10-24 12:14:20,873 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19bad9ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:20, skipping insertion in model container [2018-10-24 12:14:20,873 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:14:20" (1/1) ... [2018-10-24 12:14:20,884 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:14:20,915 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:14:21,090 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:14:21,094 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:14:21,116 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:14:21,137 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:14:21,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21 WrapperNode [2018-10-24 12:14:21,138 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:14:21,139 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:14:21,139 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:14:21,139 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:14:21,148 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (1/1) ... [2018-10-24 12:14:21,157 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (1/1) ... [2018-10-24 12:14:21,186 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:14:21,187 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:14:21,187 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:14:21,187 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:14:21,198 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (1/1) ... [2018-10-24 12:14:21,198 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (1/1) ... [2018-10-24 12:14:21,200 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (1/1) ... [2018-10-24 12:14:21,200 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (1/1) ... [2018-10-24 12:14:21,216 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (1/1) ... [2018-10-24 12:14:21,227 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (1/1) ... [2018-10-24 12:14:21,231 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (1/1) ... [2018-10-24 12:14:21,234 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:14:21,235 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:14:21,235 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:14:21,235 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:14:21,239 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (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 [2018-10-24 12:14:21,376 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:14:21,376 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:14:21,376 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:14:21,377 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:14:21,377 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:14:21,377 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:14:21,377 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:14:21,377 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:14:21,842 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:14:21,844 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:14:21 BoogieIcfgContainer [2018-10-24 12:14:21,844 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:14:21,845 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:14:21,845 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:14:21,850 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:14:21,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:14:20" (1/3) ... [2018-10-24 12:14:21,851 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c2c053 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:14:21, skipping insertion in model container [2018-10-24 12:14:21,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:21" (2/3) ... [2018-10-24 12:14:21,852 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c2c053 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:14:21, skipping insertion in model container [2018-10-24 12:14:21,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:14:21" (3/3) ... [2018-10-24 12:14:21,855 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-24 12:14:21,865 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:14:21,876 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:14:21,893 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:14:21,933 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:14:21,933 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:14:21,934 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:14:21,934 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:14:21,934 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:14:21,934 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:14:21,934 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:14:21,934 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:14:21,954 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2018-10-24 12:14:21,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:14:21,963 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:21,966 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:21,968 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:21,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:21,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1504457121, now seen corresponding path program 1 times [2018-10-24 12:14:21,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:22,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:22,031 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:22,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:22,031 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:22,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:22,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:22,125 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:14:22,125 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:14:22,125 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:14:22,131 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:14:22,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:14:22,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:14:22,146 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2018-10-24 12:14:22,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:22,167 INFO L93 Difference]: Finished difference Result 49 states and 61 transitions. [2018-10-24 12:14:22,167 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:14:22,168 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-10-24 12:14:22,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:22,177 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:14:22,177 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:14:22,180 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 [2018-10-24 12:14:22,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:14:22,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 12:14:22,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 12:14:22,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2018-10-24 12:14:22,218 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 15 [2018-10-24 12:14:22,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:22,219 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2018-10-24 12:14:22,219 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:14:22,219 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2018-10-24 12:14:22,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:14:22,220 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:22,220 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:22,221 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:22,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:22,221 INFO L82 PathProgramCache]: Analyzing trace with hash -194164888, now seen corresponding path program 1 times [2018-10-24 12:14:22,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:22,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:22,223 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:22,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:22,223 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:22,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:22,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:22,345 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:14:22,346 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:14:22,346 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:14:22,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:14:22,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:14:22,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:14:22,348 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 3 states. [2018-10-24 12:14:22,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:22,492 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2018-10-24 12:14:22,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:14:22,493 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-10-24 12:14:22,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:22,494 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:14:22,494 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:14:22,495 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:14:22,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:14:22,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2018-10-24 12:14:22,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:14:22,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2018-10-24 12:14:22,504 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 16 [2018-10-24 12:14:22,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:22,505 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2018-10-24 12:14:22,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:14:22,505 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2018-10-24 12:14:22,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:14:22,506 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:22,506 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:22,506 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:22,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:22,507 INFO L82 PathProgramCache]: Analyzing trace with hash 706658557, now seen corresponding path program 1 times [2018-10-24 12:14:22,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:22,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:22,508 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:22,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:22,509 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:22,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:22,612 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:22,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:22,613 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:22,615 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-24 12:14:22,617 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [29], [32], [46], [49], [51], [57], [58], [59], [61] [2018-10-24 12:14:22,677 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:14:22,677 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:14:22,842 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:14:24,260 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:14:24,262 INFO L272 AbstractInterpreter]: Visited 18 different actions 166 times. Merged at 4 different actions 118 times. Widened at 1 different actions 26 times. Found 29 fixpoints after 2 different actions. Largest state had 29 variables. [2018-10-24 12:14:24,304 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:24,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:14:24,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:24,306 INFO L194 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 [2018-10-24 12:14:24,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:24,347 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:24,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:24,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:24,543 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-24 12:14:24,561 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-24 12:14:24,561 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:24,587 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:24,613 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:24,613 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2018-10-24 12:14:24,910 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-10-24 12:14:24,927 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-10-24 12:14:24,928 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:24,954 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:24,976 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:24,976 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2018-10-24 12:14:25,452 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:25,453 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:26,476 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2018-10-24 12:14:26,604 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 13 [2018-10-24 12:14:26,610 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-24 12:14:26,614 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:26,638 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:26,648 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2018-10-24 12:14:26,692 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-24 12:14:26,694 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:26,726 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:26,750 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:26,751 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 6 variables, input treesize:88, output treesize:7 [2018-10-24 12:14:26,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:26,793 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:26,793 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 8, 8] total 15 [2018-10-24 12:14:26,793 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:26,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:14:26,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:14:26,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:14:26,795 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 9 states. [2018-10-24 12:14:29,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:29,420 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2018-10-24 12:14:29,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:14:29,420 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-24 12:14:29,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:29,422 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:14:29,422 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:14:29,423 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:14:29,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:14:29,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 50. [2018-10-24 12:14:29,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:14:29,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-10-24 12:14:29,434 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 19 [2018-10-24 12:14:29,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:29,434 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-10-24 12:14:29,435 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:14:29,435 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-10-24 12:14:29,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:14:29,436 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:29,436 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:29,436 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:29,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:29,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1962567395, now seen corresponding path program 2 times [2018-10-24 12:14:29,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:29,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:29,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:29,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:29,438 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:29,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:29,589 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:29,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:29,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:29,590 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:29,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:29,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:29,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:29,605 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:29,606 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:29,666 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:14:29,666 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:29,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:29,699 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:29,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:29,930 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:29,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:29,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:14:29,952 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:29,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:14:29,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:14:29,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:14:29,953 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-10-24 12:14:30,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:30,137 INFO L93 Difference]: Finished difference Result 93 states and 107 transitions. [2018-10-24 12:14:30,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:14:30,139 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2018-10-24 12:14:30,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:30,141 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:14:30,141 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:14:30,141 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:14:30,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:14:30,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2018-10-24 12:14:30,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:14:30,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2018-10-24 12:14:30,152 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 25 [2018-10-24 12:14:30,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:30,152 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2018-10-24 12:14:30,152 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:14:30,153 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2018-10-24 12:14:30,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 12:14:30,153 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:30,154 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:30,154 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:30,154 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:30,154 INFO L82 PathProgramCache]: Analyzing trace with hash 296425256, now seen corresponding path program 3 times [2018-10-24 12:14:30,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:30,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:30,157 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:30,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:30,157 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:30,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:30,436 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:30,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:30,436 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:30,436 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:30,436 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:30,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:30,437 INFO L194 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 [2018-10-24 12:14:30,447 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:14:30,447 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:14:30,489 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:14:30,490 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:30,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:30,520 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:30,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:31,647 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:31,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:31,669 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:14:31,669 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:31,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:14:31,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:14:31,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:14:31,670 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand 7 states. [2018-10-24 12:14:31,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:31,977 INFO L93 Difference]: Finished difference Result 105 states and 120 transitions. [2018-10-24 12:14:31,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:14:31,977 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2018-10-24 12:14:31,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:31,978 INFO L225 Difference]: With dead ends: 105 [2018-10-24 12:14:31,978 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:14:31,979 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:14:31,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:14:31,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 65. [2018-10-24 12:14:31,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-24 12:14:31,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2018-10-24 12:14:31,992 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 28 [2018-10-24 12:14:31,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:31,993 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2018-10-24 12:14:31,993 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:14:31,993 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2018-10-24 12:14:31,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:14:31,994 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:31,994 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:31,994 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:31,995 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:31,995 INFO L82 PathProgramCache]: Analyzing trace with hash 103930173, now seen corresponding path program 4 times [2018-10-24 12:14:31,995 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:31,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:31,996 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:31,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:31,996 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:32,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:32,180 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:32,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:32,181 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:32,181 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:32,181 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:32,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:32,182 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:32,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:32,197 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:32,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:32,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:32,240 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:32,241 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:34,574 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:34,595 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:34,595 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:14:34,596 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:34,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:14:34,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:14:34,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=120, Unknown=1, NotChecked=0, Total=182 [2018-10-24 12:14:34,597 INFO L87 Difference]: Start difference. First operand 65 states and 72 transitions. Second operand 8 states. [2018-10-24 12:14:34,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:34,823 INFO L93 Difference]: Finished difference Result 120 states and 137 transitions. [2018-10-24 12:14:34,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:14:34,824 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-10-24 12:14:34,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:34,826 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:14:34,826 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:14:34,827 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=61, Invalid=120, Unknown=1, NotChecked=0, Total=182 [2018-10-24 12:14:34,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:14:34,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2018-10-24 12:14:34,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:14:34,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2018-10-24 12:14:34,839 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 31 [2018-10-24 12:14:34,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:34,839 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2018-10-24 12:14:34,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:14:34,840 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2018-10-24 12:14:34,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 12:14:34,841 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:34,841 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:34,841 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:34,841 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:34,841 INFO L82 PathProgramCache]: Analyzing trace with hash -735747320, now seen corresponding path program 5 times [2018-10-24 12:14:34,841 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:34,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:34,842 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:34,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:34,843 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:34,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:35,129 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:35,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:35,130 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:35,130 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:35,130 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:35,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:35,130 INFO L194 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 [2018-10-24 12:14:35,139 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:35,139 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:35,350 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:14:35,351 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:35,354 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:35,424 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:35,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:36,520 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:36,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:36,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:14:36,541 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:36,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:14:36,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:14:36,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:14:36,542 INFO L87 Difference]: Start difference. First operand 74 states and 82 transitions. Second operand 9 states. [2018-10-24 12:14:37,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:37,000 INFO L93 Difference]: Finished difference Result 135 states and 154 transitions. [2018-10-24 12:14:37,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:14:37,001 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2018-10-24 12:14:37,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:37,003 INFO L225 Difference]: With dead ends: 135 [2018-10-24 12:14:37,003 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:14:37,004 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:14:37,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:14:37,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 83. [2018-10-24 12:14:37,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-24 12:14:37,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 92 transitions. [2018-10-24 12:14:37,014 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 92 transitions. Word has length 34 [2018-10-24 12:14:37,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:37,015 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 92 transitions. [2018-10-24 12:14:37,015 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:14:37,015 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 92 transitions. [2018-10-24 12:14:37,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 12:14:37,016 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:37,016 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:37,017 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:37,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:37,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1678409379, now seen corresponding path program 6 times [2018-10-24 12:14:37,017 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:37,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:37,018 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:37,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:37,019 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:37,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:37,415 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:37,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:37,416 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:37,416 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:37,416 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:37,416 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:37,416 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:37,424 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:14:37,424 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:14:37,452 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:14:37,453 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:37,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:37,506 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:37,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:43,090 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:43,112 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:43,112 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:14:43,113 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:43,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:14:43,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:14:43,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=208, Unknown=1, NotChecked=0, Total=306 [2018-10-24 12:14:43,114 INFO L87 Difference]: Start difference. First operand 83 states and 92 transitions. Second operand 10 states. [2018-10-24 12:14:43,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:43,492 INFO L93 Difference]: Finished difference Result 150 states and 171 transitions. [2018-10-24 12:14:43,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:14:43,493 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2018-10-24 12:14:43,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:43,494 INFO L225 Difference]: With dead ends: 150 [2018-10-24 12:14:43,494 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:14:43,495 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=97, Invalid=208, Unknown=1, NotChecked=0, Total=306 [2018-10-24 12:14:43,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:14:43,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2018-10-24 12:14:43,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-24 12:14:43,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 102 transitions. [2018-10-24 12:14:43,507 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 102 transitions. Word has length 37 [2018-10-24 12:14:43,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:43,507 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 102 transitions. [2018-10-24 12:14:43,507 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:14:43,508 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 102 transitions. [2018-10-24 12:14:43,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 12:14:43,509 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:43,509 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:43,509 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:43,509 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:43,509 INFO L82 PathProgramCache]: Analyzing trace with hash 267339496, now seen corresponding path program 7 times [2018-10-24 12:14:43,509 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:43,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:43,510 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:43,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:43,511 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:43,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:43,946 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:43,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:43,946 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:43,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:43,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:43,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:43,947 INFO L194 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 [2018-10-24 12:14:43,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:43,956 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:43,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:43,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:44,026 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:44,026 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:47,610 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:47,631 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:47,632 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:14:47,632 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:47,632 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:14:47,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:14:47,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:14:47,633 INFO L87 Difference]: Start difference. First operand 92 states and 102 transitions. Second operand 11 states. [2018-10-24 12:14:48,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:48,078 INFO L93 Difference]: Finished difference Result 165 states and 188 transitions. [2018-10-24 12:14:48,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:14:48,079 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 40 [2018-10-24 12:14:48,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:48,080 INFO L225 Difference]: With dead ends: 165 [2018-10-24 12:14:48,080 INFO L226 Difference]: Without dead ends: 105 [2018-10-24 12:14:48,081 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:14:48,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-24 12:14:48,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 101. [2018-10-24 12:14:48,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-24 12:14:48,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 112 transitions. [2018-10-24 12:14:48,091 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 112 transitions. Word has length 40 [2018-10-24 12:14:48,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:48,092 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 112 transitions. [2018-10-24 12:14:48,092 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:14:48,092 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 112 transitions. [2018-10-24 12:14:48,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 12:14:48,093 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:48,093 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:48,094 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:48,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:48,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1193447805, now seen corresponding path program 8 times [2018-10-24 12:14:48,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:48,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:48,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:48,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:48,095 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:48,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:48,682 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:48,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:48,683 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:48,683 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:48,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:48,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:48,683 INFO L194 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 [2018-10-24 12:14:48,693 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:48,693 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:49,344 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:14:49,344 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:49,351 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:49,407 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:49,407 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:55,118 WARN L179 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:14:55,130 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:55,151 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:55,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 13] total 23 [2018-10-24 12:14:55,152 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:55,152 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:14:55,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:14:55,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:14:55,154 INFO L87 Difference]: Start difference. First operand 101 states and 112 transitions. Second operand 12 states. [2018-10-24 12:14:55,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:55,841 INFO L93 Difference]: Finished difference Result 180 states and 205 transitions. [2018-10-24 12:14:55,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:14:55,842 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 43 [2018-10-24 12:14:55,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:55,844 INFO L225 Difference]: With dead ends: 180 [2018-10-24 12:14:55,844 INFO L226 Difference]: Without dead ends: 114 [2018-10-24 12:14:55,845 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:14:55,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-24 12:14:55,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 110. [2018-10-24 12:14:55,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-24 12:14:55,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 122 transitions. [2018-10-24 12:14:55,857 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 122 transitions. Word has length 43 [2018-10-24 12:14:55,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:55,857 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 122 transitions. [2018-10-24 12:14:55,857 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:14:55,858 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 122 transitions. [2018-10-24 12:14:55,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:14:55,859 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:55,859 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:55,859 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:55,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:55,860 INFO L82 PathProgramCache]: Analyzing trace with hash 16171720, now seen corresponding path program 9 times [2018-10-24 12:14:55,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:55,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:55,861 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:55,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:55,861 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:55,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:56,208 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:56,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:56,209 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:56,209 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:56,209 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:56,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:56,210 INFO L194 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 [2018-10-24 12:14:56,222 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:14:56,223 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:14:56,263 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:14:56,263 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:56,267 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:56,308 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:56,309 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:05,050 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:05,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:05,071 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:15:05,071 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:05,072 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:15:05,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:15:05,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:15:05,072 INFO L87 Difference]: Start difference. First operand 110 states and 122 transitions. Second operand 13 states. [2018-10-24 12:15:06,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:06,450 INFO L93 Difference]: Finished difference Result 195 states and 222 transitions. [2018-10-24 12:15:06,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:15:06,450 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2018-10-24 12:15:06,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:06,452 INFO L225 Difference]: With dead ends: 195 [2018-10-24 12:15:06,452 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:15:06,453 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:15:06,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:15:06,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 119. [2018-10-24 12:15:06,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-24 12:15:06,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 132 transitions. [2018-10-24 12:15:06,462 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 132 transitions. Word has length 46 [2018-10-24 12:15:06,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:06,463 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 132 transitions. [2018-10-24 12:15:06,463 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:15:06,463 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 132 transitions. [2018-10-24 12:15:06,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:15:06,464 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:06,464 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:06,465 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:06,465 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:06,465 INFO L82 PathProgramCache]: Analyzing trace with hash 487262621, now seen corresponding path program 10 times [2018-10-24 12:15:06,465 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:06,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:06,466 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:06,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:06,466 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:06,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:06,735 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:06,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:06,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:06,735 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:06,735 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:06,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:06,736 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:06,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:06,752 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:06,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:06,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:06,816 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:06,816 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:12,134 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:12,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:12,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:15:12,156 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:12,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:15:12,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:15:12,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:15:12,157 INFO L87 Difference]: Start difference. First operand 119 states and 132 transitions. Second operand 14 states. [2018-10-24 12:15:12,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:12,973 INFO L93 Difference]: Finished difference Result 210 states and 239 transitions. [2018-10-24 12:15:12,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:15:12,976 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2018-10-24 12:15:12,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:12,978 INFO L225 Difference]: With dead ends: 210 [2018-10-24 12:15:12,978 INFO L226 Difference]: Without dead ends: 132 [2018-10-24 12:15:12,978 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:15:12,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-24 12:15:12,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 128. [2018-10-24 12:15:12,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:15:12,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 142 transitions. [2018-10-24 12:15:12,987 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 142 transitions. Word has length 49 [2018-10-24 12:15:12,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:12,987 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 142 transitions. [2018-10-24 12:15:12,987 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:15:12,987 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 142 transitions. [2018-10-24 12:15:12,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-24 12:15:12,988 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:12,988 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:12,989 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:12,989 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:12,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1196829016, now seen corresponding path program 11 times [2018-10-24 12:15:12,989 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:12,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:12,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:12,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:12,990 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:13,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:13,322 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:13,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:13,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:13,323 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:13,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:13,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:13,323 INFO L194 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 [2018-10-24 12:15:13,331 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:13,331 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:18,710 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-24 12:15:18,711 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:18,718 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:18,756 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:18,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:28,099 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 216 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:28,120 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:28,120 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:15:28,120 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:28,120 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:15:28,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:15:28,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=532, Unknown=2, NotChecked=0, Total=756 [2018-10-24 12:15:28,121 INFO L87 Difference]: Start difference. First operand 128 states and 142 transitions. Second operand 15 states. [2018-10-24 12:15:29,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:29,069 INFO L93 Difference]: Finished difference Result 225 states and 256 transitions. [2018-10-24 12:15:29,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:15:29,070 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 52 [2018-10-24 12:15:29,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:29,072 INFO L225 Difference]: With dead ends: 225 [2018-10-24 12:15:29,072 INFO L226 Difference]: Without dead ends: 141 [2018-10-24 12:15:29,073 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=222, Invalid=532, Unknown=2, NotChecked=0, Total=756 [2018-10-24 12:15:29,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-24 12:15:29,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 137. [2018-10-24 12:15:29,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-24 12:15:29,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 152 transitions. [2018-10-24 12:15:29,083 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 152 transitions. Word has length 52 [2018-10-24 12:15:29,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:29,084 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 152 transitions. [2018-10-24 12:15:29,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:15:29,084 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 152 transitions. [2018-10-24 12:15:29,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 12:15:29,085 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:29,085 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:29,085 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:29,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:29,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1837164989, now seen corresponding path program 12 times [2018-10-24 12:15:29,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:29,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:29,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:29,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:29,087 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:29,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:29,779 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:29,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:29,779 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:29,779 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:29,779 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:29,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:29,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:29,787 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:15:29,787 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:15:29,831 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:15:29,831 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:29,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:29,876 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:29,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:39,846 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:39,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:39,869 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:15:39,869 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:39,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:15:39,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:15:39,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-24 12:15:39,870 INFO L87 Difference]: Start difference. First operand 137 states and 152 transitions. Second operand 16 states. [2018-10-24 12:15:40,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:40,777 INFO L93 Difference]: Finished difference Result 240 states and 273 transitions. [2018-10-24 12:15:40,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:15:40,779 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 55 [2018-10-24 12:15:40,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:40,780 INFO L225 Difference]: With dead ends: 240 [2018-10-24 12:15:40,780 INFO L226 Difference]: Without dead ends: 150 [2018-10-24 12:15:40,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-24 12:15:40,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-24 12:15:40,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 146. [2018-10-24 12:15:40,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-10-24 12:15:40,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 162 transitions. [2018-10-24 12:15:40,790 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 162 transitions. Word has length 55 [2018-10-24 12:15:40,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:40,790 INFO L481 AbstractCegarLoop]: Abstraction has 146 states and 162 transitions. [2018-10-24 12:15:40,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:15:40,790 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 162 transitions. [2018-10-24 12:15:40,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-24 12:15:40,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:40,791 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:40,792 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:40,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:40,792 INFO L82 PathProgramCache]: Analyzing trace with hash -34176376, now seen corresponding path program 13 times [2018-10-24 12:15:40,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:40,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:40,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:40,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:40,793 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:40,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:41,137 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:41,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:41,137 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:41,137 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:41,138 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:41,138 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:41,138 INFO L194 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 [2018-10-24 12:15:41,146 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:41,147 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:41,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:41,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:41,261 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:41,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:53,564 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 298 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:53,589 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:53,589 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:15:53,589 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:53,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:15:53,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:15:53,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-24 12:15:53,591 INFO L87 Difference]: Start difference. First operand 146 states and 162 transitions. Second operand 17 states. [2018-10-24 12:15:55,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:55,196 INFO L93 Difference]: Finished difference Result 255 states and 290 transitions. [2018-10-24 12:15:55,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:15:55,200 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 58 [2018-10-24 12:15:55,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:55,202 INFO L225 Difference]: With dead ends: 255 [2018-10-24 12:15:55,202 INFO L226 Difference]: Without dead ends: 159 [2018-10-24 12:15:55,204 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-24 12:15:55,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-24 12:15:55,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 155. [2018-10-24 12:15:55,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2018-10-24 12:15:55,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 172 transitions. [2018-10-24 12:15:55,214 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 172 transitions. Word has length 58 [2018-10-24 12:15:55,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:55,214 INFO L481 AbstractCegarLoop]: Abstraction has 155 states and 172 transitions. [2018-10-24 12:15:55,214 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:15:55,214 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 172 transitions. [2018-10-24 12:15:55,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 12:15:55,216 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:55,216 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:55,216 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:55,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:55,216 INFO L82 PathProgramCache]: Analyzing trace with hash -489279011, now seen corresponding path program 14 times [2018-10-24 12:15:55,217 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:55,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:55,217 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:55,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:55,217 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:55,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:55,925 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:55,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:55,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:55,926 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:55,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:55,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:55,926 INFO L194 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 [2018-10-24 12:15:55,934 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:55,934 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:10,243 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 12:16:10,243 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:10,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:10,297 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:10,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:10,678 WARN L179 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:16:11,728 WARN L179 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:16:12,928 WARN L179 SmtUtils]: Spent 669.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:16:15,946 WARN L179 SmtUtils]: Spent 1.39 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:16:18,679 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:18,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:18,701 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 19] total 35 [2018-10-24 12:16:18,702 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:18,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:16:18,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:16:18,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:16:18,703 INFO L87 Difference]: Start difference. First operand 155 states and 172 transitions. Second operand 18 states. [2018-10-24 12:16:20,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:20,130 INFO L93 Difference]: Finished difference Result 270 states and 307 transitions. [2018-10-24 12:16:20,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:16:20,131 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 61 [2018-10-24 12:16:20,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:20,132 INFO L225 Difference]: With dead ends: 270 [2018-10-24 12:16:20,133 INFO L226 Difference]: Without dead ends: 168 [2018-10-24 12:16:20,134 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:16:20,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-24 12:16:20,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2018-10-24 12:16:20,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-10-24 12:16:20,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 182 transitions. [2018-10-24 12:16:20,143 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 182 transitions. Word has length 61 [2018-10-24 12:16:20,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:20,143 INFO L481 AbstractCegarLoop]: Abstraction has 164 states and 182 transitions. [2018-10-24 12:16:20,143 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:16:20,144 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 182 transitions. [2018-10-24 12:16:20,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-24 12:16:20,144 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:20,145 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:20,145 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:20,145 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:20,145 INFO L82 PathProgramCache]: Analyzing trace with hash 759875176, now seen corresponding path program 15 times [2018-10-24 12:16:20,145 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:20,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:20,146 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:20,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:20,146 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:20,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:20,466 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:20,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:20,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:20,466 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:20,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:20,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:20,467 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:20,474 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:20,474 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:20,524 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:20,524 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:20,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:20,575 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:20,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:33,725 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:33,745 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:33,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:16:33,745 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:33,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:16:33,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:16:33,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:16:33,747 INFO L87 Difference]: Start difference. First operand 164 states and 182 transitions. Second operand 19 states. [2018-10-24 12:16:35,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:35,217 INFO L93 Difference]: Finished difference Result 285 states and 324 transitions. [2018-10-24 12:16:35,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:16:35,218 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 64 [2018-10-24 12:16:35,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:35,219 INFO L225 Difference]: With dead ends: 285 [2018-10-24 12:16:35,219 INFO L226 Difference]: Without dead ends: 177 [2018-10-24 12:16:35,220 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:16:35,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-24 12:16:35,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 173. [2018-10-24 12:16:35,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2018-10-24 12:16:35,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 192 transitions. [2018-10-24 12:16:35,228 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 192 transitions. Word has length 64 [2018-10-24 12:16:35,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:35,228 INFO L481 AbstractCegarLoop]: Abstraction has 173 states and 192 transitions. [2018-10-24 12:16:35,229 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:16:35,229 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 192 transitions. [2018-10-24 12:16:35,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-24 12:16:35,229 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:35,230 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:35,230 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:35,230 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:35,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1579359747, now seen corresponding path program 16 times [2018-10-24 12:16:35,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:35,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:35,231 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:35,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:35,231 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:35,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:35,738 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:35,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:35,739 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:35,739 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:35,739 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:35,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:35,739 INFO L194 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 [2018-10-24 12:16:35,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:35,748 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:35,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:35,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:35,837 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:35,837 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:51,801 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:51,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:51,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:16:51,822 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:51,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:16:51,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:16:51,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1008, Unknown=1, NotChecked=0, Total=1406 [2018-10-24 12:16:51,823 INFO L87 Difference]: Start difference. First operand 173 states and 192 transitions. Second operand 20 states. [2018-10-24 12:16:53,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:53,251 INFO L93 Difference]: Finished difference Result 300 states and 341 transitions. [2018-10-24 12:16:53,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:16:53,252 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-10-24 12:16:53,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:53,253 INFO L225 Difference]: With dead ends: 300 [2018-10-24 12:16:53,253 INFO L226 Difference]: Without dead ends: 186 [2018-10-24 12:16:53,255 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=397, Invalid=1008, Unknown=1, NotChecked=0, Total=1406 [2018-10-24 12:16:53,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-24 12:16:53,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 182. [2018-10-24 12:16:53,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-10-24 12:16:53,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 202 transitions. [2018-10-24 12:16:53,263 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 202 transitions. Word has length 67 [2018-10-24 12:16:53,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:53,263 INFO L481 AbstractCegarLoop]: Abstraction has 182 states and 202 transitions. [2018-10-24 12:16:53,264 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:16:53,264 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 202 transitions. [2018-10-24 12:16:53,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-24 12:16:53,264 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:53,264 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:53,265 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:53,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:53,265 INFO L82 PathProgramCache]: Analyzing trace with hash 412394056, now seen corresponding path program 17 times [2018-10-24 12:16:53,265 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:53,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:53,266 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:53,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:53,266 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:53,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:54,698 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:54,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:54,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:54,699 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:54,699 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:54,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:54,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:54,707 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:54,708 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:36,858 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-24 12:17:36,858 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:36,877 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:36,932 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:17:36,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:38,784 WARN L179 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:17:39,076 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:17:41,390 WARN L179 SmtUtils]: Spent 666.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:17:42,401 WARN L179 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:17:44,415 WARN L854 $PredicateComparison]: unable to prove that (or (<= 1000 (mod (+ c_main_~index~0 10) 4294967296)) (< (mod (+ c_main_~index~0 11) 4294967296) 1000)) is different from true [2018-10-24 12:17:45,615 WARN L179 SmtUtils]: Spent 371.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:17:45,884 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:17:47,124 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 53 not checked. [2018-10-24 12:17:47,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:47,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 22] total 41 [2018-10-24 12:17:47,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:47,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:17:47,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:17:47,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=1122, Unknown=1, NotChecked=76, Total=1640 [2018-10-24 12:17:47,150 INFO L87 Difference]: Start difference. First operand 182 states and 202 transitions. Second operand 21 states. [2018-10-24 12:17:48,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:48,754 INFO L93 Difference]: Finished difference Result 315 states and 358 transitions. [2018-10-24 12:17:48,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:17:48,755 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 70 [2018-10-24 12:17:48,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:48,756 INFO L225 Difference]: With dead ends: 315 [2018-10-24 12:17:48,756 INFO L226 Difference]: Without dead ends: 195 [2018-10-24 12:17:48,758 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=441, Invalid=1122, Unknown=1, NotChecked=76, Total=1640 [2018-10-24 12:17:48,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-24 12:17:48,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 191. [2018-10-24 12:17:48,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2018-10-24 12:17:48,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 212 transitions. [2018-10-24 12:17:48,767 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 212 transitions. Word has length 70 [2018-10-24 12:17:48,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:48,768 INFO L481 AbstractCegarLoop]: Abstraction has 191 states and 212 transitions. [2018-10-24 12:17:48,768 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:17:48,768 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 212 transitions. [2018-10-24 12:17:48,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-24 12:17:48,768 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:48,769 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:48,769 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:48,769 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:48,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1776744989, now seen corresponding path program 18 times [2018-10-24 12:17:48,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:48,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:48,770 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:48,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:48,770 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:48,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:49,204 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:17:49,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:49,205 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:49,205 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:49,205 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:49,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:49,205 INFO L194 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 [2018-10-24 12:17:49,214 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:49,214 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:49,280 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:49,280 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:49,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:49,399 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:17:49,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:17,645 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 548 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:17,667 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:17,667 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:18:17,667 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:17,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:18:17,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:18:17,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1236, Unknown=5, NotChecked=0, Total=1722 [2018-10-24 12:18:17,668 INFO L87 Difference]: Start difference. First operand 191 states and 212 transitions. Second operand 22 states. [2018-10-24 12:18:19,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:19,972 INFO L93 Difference]: Finished difference Result 330 states and 375 transitions. [2018-10-24 12:18:19,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:18:19,972 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 73 [2018-10-24 12:18:19,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:19,975 INFO L225 Difference]: With dead ends: 330 [2018-10-24 12:18:19,975 INFO L226 Difference]: Without dead ends: 204 [2018-10-24 12:18:19,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.6s TimeCoverageRelationStatistics Valid=481, Invalid=1236, Unknown=5, NotChecked=0, Total=1722 [2018-10-24 12:18:19,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-24 12:18:19,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 200. [2018-10-24 12:18:19,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-10-24 12:18:19,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 222 transitions. [2018-10-24 12:18:19,987 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 222 transitions. Word has length 73 [2018-10-24 12:18:19,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:19,988 INFO L481 AbstractCegarLoop]: Abstraction has 200 states and 222 transitions. [2018-10-24 12:18:19,988 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:18:19,988 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 222 transitions. [2018-10-24 12:18:19,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 12:18:19,989 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:19,989 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:19,989 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:19,989 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:19,989 INFO L82 PathProgramCache]: Analyzing trace with hash -415099352, now seen corresponding path program 19 times [2018-10-24 12:18:19,989 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:19,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:19,990 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:19,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:19,990 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:20,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:20,623 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:20,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:20,624 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:20,624 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:20,624 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:20,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:20,624 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:20,632 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:20,632 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:20,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:20,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:20,716 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:20,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:47,266 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 607 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:47,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:47,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-24 12:18:47,286 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:47,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:18:47,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:18:47,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1363, Unknown=3, NotChecked=0, Total=1892 [2018-10-24 12:18:47,288 INFO L87 Difference]: Start difference. First operand 200 states and 222 transitions. Second operand 23 states. [2018-10-24 12:18:49,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:49,656 INFO L93 Difference]: Finished difference Result 345 states and 392 transitions. [2018-10-24 12:18:49,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:18:49,657 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 76 [2018-10-24 12:18:49,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:49,658 INFO L225 Difference]: With dead ends: 345 [2018-10-24 12:18:49,658 INFO L226 Difference]: Without dead ends: 213 [2018-10-24 12:18:49,660 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 130 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=526, Invalid=1363, Unknown=3, NotChecked=0, Total=1892 [2018-10-24 12:18:49,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2018-10-24 12:18:49,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 209. [2018-10-24 12:18:49,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-10-24 12:18:49,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 232 transitions. [2018-10-24 12:18:49,669 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 232 transitions. Word has length 76 [2018-10-24 12:18:49,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:49,670 INFO L481 AbstractCegarLoop]: Abstraction has 209 states and 232 transitions. [2018-10-24 12:18:49,670 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:18:49,670 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 232 transitions. [2018-10-24 12:18:49,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:18:49,671 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:49,671 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:49,671 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:49,671 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:49,671 INFO L82 PathProgramCache]: Analyzing trace with hash -1262060995, now seen corresponding path program 20 times [2018-10-24 12:18:49,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:49,672 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:49,672 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:49,672 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:49,673 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:49,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:50,602 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:50,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:50,602 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:50,603 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:50,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:50,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:50,603 INFO L194 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 [2018-10-24 12:18:50,611 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:50,611 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown