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-EXP.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/nested_true-unreach-call.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:38:26,094 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:38:26,097 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:38:26,111 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:38:26,112 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:38:26,113 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:38:26,114 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:38:26,116 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:38:26,118 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:38:26,118 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:38:26,119 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:38:26,120 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:38:26,120 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:38:26,121 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:38:26,123 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:38:26,123 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:38:26,124 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:38:26,126 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:38:26,128 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:38:26,130 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:38:26,133 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:38:26,134 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:38:26,140 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:38:26,141 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:38:26,142 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:38:26,143 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:38:26,143 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:38:26,147 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:38:26,148 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:38:26,148 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:38:26,150 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:38:26,151 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:38:26,154 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:38:26,182 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:38:26,182 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:38:26,183 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:38:26,183 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:38:26,184 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:38:26,186 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:38:26,186 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:38:26,186 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:38:26,186 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:38:26,187 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:38:26,187 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:38:26,187 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:38:26,188 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:38:26,188 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:38:26,189 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:38:26,189 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:38:26,189 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:38:26,189 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:38:26,189 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:38:26,190 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:38:26,191 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:38:26,192 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:38:26,192 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:38:26,192 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:38:26,192 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:38:26,193 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:38:26,193 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:38:26,193 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:38:26,193 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:38:26,193 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:38:26,194 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:38:26,194 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:38:26,194 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:38:26,194 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:38:26,194 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:38:26,194 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:38:26,280 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:38:26,299 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:38:26,303 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:38:26,305 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:38:26,306 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:38:26,306 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-industry-pattern/nested_true-unreach-call.c [2018-10-24 12:38:26,360 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d66c1fb44/ee136b5d9ed24ba38cee0b841327f544/FLAG58e4616e4 [2018-10-24 12:38:26,837 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:38:26,838 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested_true-unreach-call.c [2018-10-24 12:38:26,846 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d66c1fb44/ee136b5d9ed24ba38cee0b841327f544/FLAG58e4616e4 [2018-10-24 12:38:26,867 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d66c1fb44/ee136b5d9ed24ba38cee0b841327f544 [2018-10-24 12:38:26,881 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:38:26,883 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:38:26,884 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:38:26,884 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:38:26,889 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:38:26,890 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:38:26" (1/1) ... [2018-10-24 12:38:26,894 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b326c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:26, skipping insertion in model container [2018-10-24 12:38:26,894 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:38:26" (1/1) ... [2018-10-24 12:38:26,906 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:38:26,940 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:38:27,126 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:38:27,130 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:38:27,149 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:38:27,163 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:38:27,164 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27 WrapperNode [2018-10-24 12:38:27,164 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:38:27,164 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:38:27,165 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:38:27,165 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:38:27,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (1/1) ... [2018-10-24 12:38:27,178 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (1/1) ... [2018-10-24 12:38:27,185 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:38:27,185 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:38:27,185 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:38:27,185 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:38:27,193 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (1/1) ... [2018-10-24 12:38:27,193 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (1/1) ... [2018-10-24 12:38:27,194 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (1/1) ... [2018-10-24 12:38:27,194 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (1/1) ... [2018-10-24 12:38:27,198 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (1/1) ... [2018-10-24 12:38:27,203 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (1/1) ... [2018-10-24 12:38:27,204 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (1/1) ... [2018-10-24 12:38:27,205 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:38:27,206 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:38:27,206 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:38:27,206 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:38:27,207 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (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 12:38:27,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:38:27,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:38:27,327 INFO L130 BoogieDeclarations]: Found specification of procedure nondet [2018-10-24 12:38:27,327 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet [2018-10-24 12:38:27,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:38:27,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:38:27,327 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:38:27,328 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:38:27,328 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:38:27,328 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:38:27,705 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:38:27,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:38:27 BoogieIcfgContainer [2018-10-24 12:38:27,706 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:38:27,707 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:38:27,707 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:38:27,711 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:38:27,711 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:38:26" (1/3) ... [2018-10-24 12:38:27,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@397b8877 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:38:27, skipping insertion in model container [2018-10-24 12:38:27,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:27" (2/3) ... [2018-10-24 12:38:27,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@397b8877 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:38:27, skipping insertion in model container [2018-10-24 12:38:27,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:38:27" (3/3) ... [2018-10-24 12:38:27,715 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_true-unreach-call.c [2018-10-24 12:38:27,725 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:38:27,733 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:38:27,761 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:38:27,806 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:38:27,806 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:38:27,806 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:38:27,807 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:38:27,807 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:38:27,807 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:38:27,807 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:38:27,807 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:38:27,830 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2018-10-24 12:38:27,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:38:27,837 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:27,838 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:27,841 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:27,847 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:27,847 INFO L82 PathProgramCache]: Analyzing trace with hash -1030098894, now seen corresponding path program 1 times [2018-10-24 12:38:27,850 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:27,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:27,903 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:27,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:27,903 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:27,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:27,975 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 12:38:27,977 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:38:27,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:38:27,978 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:27,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:38:27,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:38:27,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:38:28,002 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2018-10-24 12:38:28,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:28,025 INFO L93 Difference]: Finished difference Result 44 states and 60 transitions. [2018-10-24 12:38:28,025 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:38:28,027 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 19 [2018-10-24 12:38:28,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:28,036 INFO L225 Difference]: With dead ends: 44 [2018-10-24 12:38:28,037 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:38:28,041 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 12:38:28,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:38:28,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-24 12:38:28,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-24 12:38:28,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2018-10-24 12:38:28,090 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 19 [2018-10-24 12:38:28,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:28,091 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2018-10-24 12:38:28,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:38:28,091 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2018-10-24 12:38:28,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:38:28,095 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:28,095 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:28,095 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:28,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:28,096 INFO L82 PathProgramCache]: Analyzing trace with hash -1176183033, now seen corresponding path program 1 times [2018-10-24 12:38:28,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:28,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:28,098 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:28,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:28,099 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:28,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:28,252 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 12:38:28,252 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:38:28,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:38:28,253 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:28,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:38:28,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:38:28,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:38:28,256 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 3 states. [2018-10-24 12:38:28,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:28,440 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2018-10-24 12:38:28,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:38:28,442 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2018-10-24 12:38:28,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:28,444 INFO L225 Difference]: With dead ends: 46 [2018-10-24 12:38:28,444 INFO L226 Difference]: Without dead ends: 31 [2018-10-24 12:38:28,446 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 12:38:28,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-24 12:38:28,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2018-10-24 12:38:28,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:38:28,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2018-10-24 12:38:28,458 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 20 [2018-10-24 12:38:28,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:28,458 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2018-10-24 12:38:28,459 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:38:28,459 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2018-10-24 12:38:28,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:38:28,461 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:28,461 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:28,462 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:28,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:28,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1045124110, now seen corresponding path program 1 times [2018-10-24 12:38:28,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:28,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:28,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:28,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:28,465 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:28,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:28,523 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 12:38:28,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:28,524 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:28,525 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-24 12:38:28,528 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [3], [8], [12], [18], [22], [25], [27], [32], [34], [40], [48], [55], [58], [60], [66], [67], [68], [70], [71], [72] [2018-10-24 12:38:28,564 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:38:28,564 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:38:28,732 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-24 12:38:28,733 INFO L272 AbstractInterpreter]: Visited 18 different actions 28 times. Merged at 4 different actions 8 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 8 variables. [2018-10-24 12:38:28,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:28,740 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-24 12:38:28,821 INFO L232 lantSequenceWeakener]: Weakened 7 states. On average, predicates are now at 21.9% of their original sizes. [2018-10-24 12:38:28,822 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-24 12:38:29,117 INFO L413 sIntCurrentIteration]: We have 23 unified AI predicates [2018-10-24 12:38:29,117 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-24 12:38:29,118 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:38:29,119 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [4] total 9 [2018-10-24 12:38:29,120 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:29,120 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:38:29,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:38:29,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:38:29,121 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 7 states. [2018-10-24 12:38:29,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:29,906 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2018-10-24 12:38:29,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:38:29,907 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2018-10-24 12:38:29,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:29,910 INFO L225 Difference]: With dead ends: 53 [2018-10-24 12:38:29,910 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:38:29,911 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 4 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:38:29,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:38:29,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-24 12:38:29,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:38:29,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2018-10-24 12:38:29,922 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 24 [2018-10-24 12:38:29,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:29,923 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2018-10-24 12:38:29,924 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:38:29,924 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2018-10-24 12:38:29,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:38:29,925 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:29,925 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:29,925 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:29,927 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:29,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1102382412, now seen corresponding path program 1 times [2018-10-24 12:38:29,927 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:29,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:29,928 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:29,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:29,930 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:29,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:30,010 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 12:38:30,011 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:30,011 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:30,011 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-24 12:38:30,012 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [3], [8], [12], [18], [22], [25], [27], [32], [34], [42], [48], [55], [58], [60], [66], [67], [68], [70], [71], [72] [2018-10-24 12:38:30,014 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:38:30,014 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:38:30,040 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:38:30,041 INFO L272 AbstractInterpreter]: Visited 23 different actions 33 times. Merged at 4 different actions 8 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 8 variables. [2018-10-24 12:38:30,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:30,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:38:30,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:30,057 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 12:38:30,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:30,066 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:30,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:30,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:30,115 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 12:38:30,116 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:30,204 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 12:38:30,227 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:30,227 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:38:30,227 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:30,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:38:30,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:38:30,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:38:30,229 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand 4 states. [2018-10-24 12:38:30,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:30,292 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2018-10-24 12:38:30,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:38:30,293 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2018-10-24 12:38:30,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:30,294 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:38:30,294 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:38:30,295 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:38:30,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:38:30,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2018-10-24 12:38:30,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 12:38:30,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2018-10-24 12:38:30,305 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 24 [2018-10-24 12:38:30,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:30,305 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2018-10-24 12:38:30,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:38:30,305 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2018-10-24 12:38:30,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 12:38:30,308 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:30,308 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:30,308 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:30,309 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:30,309 INFO L82 PathProgramCache]: Analyzing trace with hash -1808032045, now seen corresponding path program 2 times [2018-10-24 12:38:30,309 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:30,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:30,310 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:30,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:30,311 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:30,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:30,416 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:30,416 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:30,416 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:30,417 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:30,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:30,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:30,417 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 12:38:30,426 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:30,426 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:30,442 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:38:30,442 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:30,444 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:30,856 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-10-24 12:38:31,044 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:38:31,045 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:31,274 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:38:31,296 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-10-24 12:38:31,296 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [5, 8] total 18 [2018-10-24 12:38:31,296 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:31,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:38:31,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:38:31,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:38:31,299 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 9 states. [2018-10-24 12:38:31,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:31,506 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2018-10-24 12:38:31,506 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:38:31,506 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-24 12:38:31,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:31,510 INFO L225 Difference]: With dead ends: 62 [2018-10-24 12:38:31,510 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:38:31,511 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:38:31,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:38:31,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2018-10-24 12:38:31,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-24 12:38:31,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2018-10-24 12:38:31,521 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 28 [2018-10-24 12:38:31,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:31,522 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2018-10-24 12:38:31,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:38:31,522 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2018-10-24 12:38:31,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 12:38:31,523 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:31,523 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:31,524 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:31,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:31,524 INFO L82 PathProgramCache]: Analyzing trace with hash -1809879087, now seen corresponding path program 1 times [2018-10-24 12:38:31,524 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:31,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:31,525 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:31,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:31,525 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:31,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:31,567 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-24 12:38:31,568 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:38:31,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-10-24 12:38:31,568 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:31,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:38:31,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:38:31,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-24 12:38:31,569 INFO L87 Difference]: Start difference. First operand 58 states and 70 transitions. Second operand 4 states. [2018-10-24 12:38:31,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:31,634 INFO L93 Difference]: Finished difference Result 93 states and 117 transitions. [2018-10-24 12:38:31,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:38:31,635 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 28 [2018-10-24 12:38:31,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:31,639 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:38:31,640 INFO L226 Difference]: Without dead ends: 72 [2018-10-24 12:38:31,643 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-24 12:38:31,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-24 12:38:31,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2018-10-24 12:38:31,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-24 12:38:31,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2018-10-24 12:38:31,660 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 28 [2018-10-24 12:38:31,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:31,660 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2018-10-24 12:38:31,660 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:38:31,661 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2018-10-24 12:38:31,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 12:38:31,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:31,662 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:31,662 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:31,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:31,662 INFO L82 PathProgramCache]: Analyzing trace with hash -1472263337, now seen corresponding path program 1 times [2018-10-24 12:38:31,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:31,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:31,663 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:31,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:31,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:31,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:31,726 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:31,726 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:31,727 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:31,727 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 29 with the following transitions: [2018-10-24 12:38:31,727 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [3], [8], [12], [18], [22], [25], [27], [30], [32], [34], [40], [48], [55], [58], [60], [66], [67], [68], [70], [71], [72] [2018-10-24 12:38:31,729 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:38:31,729 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:38:31,809 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:38:31,809 INFO L272 AbstractInterpreter]: Visited 24 different actions 61 times. Merged at 6 different actions 27 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 5 different actions. Largest state had 8 variables. [2018-10-24 12:38:31,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:31,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:38:31,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:31,824 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 12:38:31,838 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:31,838 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:31,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:31,856 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:31,862 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:31,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:31,951 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:31,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:31,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:38:31,975 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:31,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:38:31,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:38:31,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:38:31,976 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand 5 states. [2018-10-24 12:38:32,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:32,041 INFO L93 Difference]: Finished difference Result 131 states and 166 transitions. [2018-10-24 12:38:32,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:38:32,041 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2018-10-24 12:38:32,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:32,043 INFO L225 Difference]: With dead ends: 131 [2018-10-24 12:38:32,043 INFO L226 Difference]: Without dead ends: 92 [2018-10-24 12:38:32,044 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:38:32,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-24 12:38:32,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 84. [2018-10-24 12:38:32,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-24 12:38:32,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 102 transitions. [2018-10-24 12:38:32,055 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 102 transitions. Word has length 28 [2018-10-24 12:38:32,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:32,055 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 102 transitions. [2018-10-24 12:38:32,056 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:38:32,056 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 102 transitions. [2018-10-24 12:38:32,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:38:32,057 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:32,057 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:32,057 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:32,058 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:32,058 INFO L82 PathProgramCache]: Analyzing trace with hash -1153463970, now seen corresponding path program 2 times [2018-10-24 12:38:32,058 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:32,059 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:32,059 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:32,059 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:32,059 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:32,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:32,238 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:32,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:32,239 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:32,239 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:32,239 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:32,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:32,239 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 12:38:32,247 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:32,248 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:32,265 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:38:32,265 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:32,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:32,514 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-24 12:38:32,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:32,718 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-24 12:38:32,739 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-10-24 12:38:32,739 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 9] total 20 [2018-10-24 12:38:32,739 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:32,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:38:32,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:38:32,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:38:32,741 INFO L87 Difference]: Start difference. First operand 84 states and 102 transitions. Second operand 9 states. [2018-10-24 12:38:32,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:32,914 INFO L93 Difference]: Finished difference Result 94 states and 113 transitions. [2018-10-24 12:38:32,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:38:32,914 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2018-10-24 12:38:32,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:32,916 INFO L225 Difference]: With dead ends: 94 [2018-10-24 12:38:32,916 INFO L226 Difference]: Without dead ends: 92 [2018-10-24 12:38:32,917 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:38:32,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-24 12:38:32,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 84. [2018-10-24 12:38:32,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-24 12:38:32,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 102 transitions. [2018-10-24 12:38:32,928 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 102 transitions. Word has length 32 [2018-10-24 12:38:32,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:32,929 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 102 transitions. [2018-10-24 12:38:32,929 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:38:32,929 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 102 transitions. [2018-10-24 12:38:32,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:38:32,930 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:32,930 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:32,930 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:32,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:32,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1155311012, now seen corresponding path program 1 times [2018-10-24 12:38:32,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:32,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:32,932 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:32,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:32,932 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:32,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:32,997 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-24 12:38:32,998 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:38:32,998 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:38:32,998 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:32,998 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:38:32,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:38:32,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:38:32,999 INFO L87 Difference]: Start difference. First operand 84 states and 102 transitions. Second operand 3 states. [2018-10-24 12:38:33,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:33,040 INFO L93 Difference]: Finished difference Result 128 states and 159 transitions. [2018-10-24 12:38:33,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:38:33,043 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 32 [2018-10-24 12:38:33,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:33,044 INFO L225 Difference]: With dead ends: 128 [2018-10-24 12:38:33,044 INFO L226 Difference]: Without dead ends: 90 [2018-10-24 12:38:33,044 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 12:38:33,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-24 12:38:33,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2018-10-24 12:38:33,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-24 12:38:33,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 102 transitions. [2018-10-24 12:38:33,054 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 102 transitions. Word has length 32 [2018-10-24 12:38:33,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:33,055 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 102 transitions. [2018-10-24 12:38:33,055 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:38:33,055 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 102 transitions. [2018-10-24 12:38:33,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:38:33,056 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:33,056 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:33,057 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:33,057 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:33,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1098052710, now seen corresponding path program 1 times [2018-10-24 12:38:33,057 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:33,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:33,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,059 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:33,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:33,129 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:33,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:33,130 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:33,130 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 33 with the following transitions: [2018-10-24 12:38:33,130 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [3], [8], [12], [18], [22], [25], [27], [30], [32], [34], [42], [46], [55], [58], [60], [66], [67], [68], [70], [71], [72] [2018-10-24 12:38:33,132 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:38:33,132 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:38:33,195 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:38:33,196 INFO L272 AbstractInterpreter]: Visited 24 different actions 64 times. Merged at 7 different actions 30 times. Widened at 1 different actions 1 times. Found 10 fixpoints after 5 different actions. Largest state had 8 variables. [2018-10-24 12:38:33,239 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:33,239 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:38:33,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:33,239 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 12:38:33,247 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:33,247 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:33,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:33,279 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:33,285 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:33,286 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:33,432 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:33,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:33,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:38:33,454 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:33,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:38:33,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:38:33,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:38:33,455 INFO L87 Difference]: Start difference. First operand 84 states and 102 transitions. Second operand 6 states. [2018-10-24 12:38:33,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:33,519 INFO L93 Difference]: Finished difference Result 155 states and 196 transitions. [2018-10-24 12:38:33,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:38:33,520 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2018-10-24 12:38:33,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:33,521 INFO L225 Difference]: With dead ends: 155 [2018-10-24 12:38:33,521 INFO L226 Difference]: Without dead ends: 108 [2018-10-24 12:38:33,522 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:38:33,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-24 12:38:33,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 100. [2018-10-24 12:38:33,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-24 12:38:33,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 122 transitions. [2018-10-24 12:38:33,532 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 122 transitions. Word has length 32 [2018-10-24 12:38:33,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:33,532 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 122 transitions. [2018-10-24 12:38:33,533 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:38:33,533 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 122 transitions. [2018-10-24 12:38:33,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-24 12:38:33,534 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:33,534 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:33,534 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:33,535 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:33,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1098984993, now seen corresponding path program 2 times [2018-10-24 12:38:33,535 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:33,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,536 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:33,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,536 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:33,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:33,606 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:33,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:33,607 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:33,607 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:33,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:33,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:33,608 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 12:38:33,618 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:33,618 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:33,660 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:38:33,660 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:33,665 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:33,708 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-24 12:38:33,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:33,753 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-24 12:38:33,774 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:38:33,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [7] total 11 [2018-10-24 12:38:33,775 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:33,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:38:33,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:38:33,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:38:33,776 INFO L87 Difference]: Start difference. First operand 100 states and 122 transitions. Second operand 5 states. [2018-10-24 12:38:33,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:33,860 INFO L93 Difference]: Finished difference Result 181 states and 219 transitions. [2018-10-24 12:38:33,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:38:33,861 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2018-10-24 12:38:33,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:33,862 INFO L225 Difference]: With dead ends: 181 [2018-10-24 12:38:33,862 INFO L226 Difference]: Without dead ends: 135 [2018-10-24 12:38:33,863 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:38:33,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-24 12:38:33,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 98. [2018-10-24 12:38:33,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-24 12:38:33,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 118 transitions. [2018-10-24 12:38:33,874 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 118 transitions. Word has length 36 [2018-10-24 12:38:33,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:33,874 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 118 transitions. [2018-10-24 12:38:33,874 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:38:33,874 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 118 transitions. [2018-10-24 12:38:33,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-24 12:38:33,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:33,877 INFO L375 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:33,877 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:33,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:33,877 INFO L82 PathProgramCache]: Analyzing trace with hash 2113546820, now seen corresponding path program 1 times [2018-10-24 12:38:33,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:33,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:33,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,879 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:33,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:33,993 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 86 proven. 32 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-10-24 12:38:33,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:33,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:33,993 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 64 with the following transitions: [2018-10-24 12:38:33,994 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [3], [8], [12], [18], [22], [25], [27], [32], [34], [42], [48], [55], [58], [60], [63], [65], [66], [67], [68], [70], [71], [72], [73] [2018-10-24 12:38:33,995 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:38:33,996 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:38:34,040 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:38:34,041 INFO L272 AbstractInterpreter]: Visited 26 different actions 65 times. Merged at 10 different actions 28 times. Widened at 2 different actions 2 times. Found 5 fixpoints after 3 different actions. Largest state had 8 variables. [2018-10-24 12:38:34,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:34,078 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:38:34,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:34,078 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 12:38:34,092 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:34,092 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:34,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:34,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:34,127 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 84 proven. 32 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2018-10-24 12:38:34,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:34,253 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 86 proven. 32 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-10-24 12:38:34,275 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:34,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:38:34,275 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:34,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:38:34,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:38:34,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:38:34,276 INFO L87 Difference]: Start difference. First operand 98 states and 118 transitions. Second operand 7 states. [2018-10-24 12:38:34,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:34,458 INFO L93 Difference]: Finished difference Result 175 states and 218 transitions. [2018-10-24 12:38:34,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:38:34,459 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 63 [2018-10-24 12:38:34,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:34,460 INFO L225 Difference]: With dead ends: 175 [2018-10-24 12:38:34,460 INFO L226 Difference]: Without dead ends: 122 [2018-10-24 12:38:34,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:38:34,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-10-24 12:38:34,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 114. [2018-10-24 12:38:34,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-24 12:38:34,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 138 transitions. [2018-10-24 12:38:34,469 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 138 transitions. Word has length 63 [2018-10-24 12:38:34,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:34,470 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 138 transitions. [2018-10-24 12:38:34,470 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:38:34,470 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 138 transitions. [2018-10-24 12:38:34,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:38:34,472 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:34,473 INFO L375 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:34,473 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:34,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:34,473 INFO L82 PathProgramCache]: Analyzing trace with hash -631971868, now seen corresponding path program 2 times [2018-10-24 12:38:34,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:34,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:34,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,474 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:34,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:34,570 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 126 proven. 50 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2018-10-24 12:38:34,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:34,570 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:34,570 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:34,571 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:34,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:34,571 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 12:38:34,578 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:34,578 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:34,621 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:38:34,621 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:34,625 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:35,268 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 20 proven. 127 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2018-10-24 12:38:35,269 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:35,597 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2018-10-24 12:38:35,618 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:35,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 8] total 22 [2018-10-24 12:38:35,618 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:35,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:38:35,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:38:35,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:38:35,620 INFO L87 Difference]: Start difference. First operand 114 states and 138 transitions. Second operand 16 states. [2018-10-24 12:38:36,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:36,327 INFO L93 Difference]: Finished difference Result 270 states and 341 transitions. [2018-10-24 12:38:36,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:38:36,328 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 71 [2018-10-24 12:38:36,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:36,330 INFO L225 Difference]: With dead ends: 270 [2018-10-24 12:38:36,330 INFO L226 Difference]: Without dead ends: 209 [2018-10-24 12:38:36,331 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=253, Invalid=937, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:38:36,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-10-24 12:38:36,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 199. [2018-10-24 12:38:36,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-10-24 12:38:36,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 244 transitions. [2018-10-24 12:38:36,348 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 244 transitions. Word has length 71 [2018-10-24 12:38:36,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:36,350 INFO L481 AbstractCegarLoop]: Abstraction has 199 states and 244 transitions. [2018-10-24 12:38:36,350 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:38:36,350 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 244 transitions. [2018-10-24 12:38:36,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:38:36,356 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:36,356 INFO L375 BasicCegarLoop]: trace histogram [14, 12, 12, 11, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:36,356 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:36,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:36,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1550893440, now seen corresponding path program 1 times [2018-10-24 12:38:36,363 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:36,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:36,365 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:36,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:36,365 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:36,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:36,519 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 174 proven. 72 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2018-10-24 12:38:36,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:36,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:36,520 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 80 with the following transitions: [2018-10-24 12:38:36,520 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [3], [8], [12], [18], [22], [25], [27], [30], [32], [34], [40], [42], [48], [55], [58], [60], [63], [65], [66], [67], [68], [70], [71], [72], [73] [2018-10-24 12:38:36,522 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:38:36,522 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:38:36,655 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:38:36,655 INFO L272 AbstractInterpreter]: Visited 28 different actions 200 times. Merged at 12 different actions 87 times. Widened at 3 different actions 13 times. Found 21 fixpoints after 6 different actions. Largest state had 8 variables. [2018-10-24 12:38:36,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:36,687 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:38:36,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:36,687 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 12:38:36,698 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:36,698 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:36,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:36,730 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:36,754 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 172 proven. 72 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:38:36,754 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:37,172 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 174 proven. 72 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2018-10-24 12:38:37,194 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:37,194 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:38:37,194 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:37,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:38:37,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:38:37,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:38:37,196 INFO L87 Difference]: Start difference. First operand 199 states and 244 transitions. Second operand 9 states. [2018-10-24 12:38:37,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:37,356 INFO L93 Difference]: Finished difference Result 365 states and 456 transitions. [2018-10-24 12:38:37,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:38:37,357 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 79 [2018-10-24 12:38:37,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:37,358 INFO L225 Difference]: With dead ends: 365 [2018-10-24 12:38:37,358 INFO L226 Difference]: Without dead ends: 227 [2018-10-24 12:38:37,362 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:38:37,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-10-24 12:38:37,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 215. [2018-10-24 12:38:37,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-10-24 12:38:37,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 264 transitions. [2018-10-24 12:38:37,374 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 264 transitions. Word has length 79 [2018-10-24 12:38:37,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:37,375 INFO L481 AbstractCegarLoop]: Abstraction has 215 states and 264 transitions. [2018-10-24 12:38:37,375 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:38:37,375 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 264 transitions. [2018-10-24 12:38:37,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-24 12:38:37,377 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:37,377 INFO L375 BasicCegarLoop]: trace histogram [16, 14, 14, 13, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:37,377 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:37,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:37,378 INFO L82 PathProgramCache]: Analyzing trace with hash -801878872, now seen corresponding path program 2 times [2018-10-24 12:38:37,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:37,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:37,379 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:37,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:37,379 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:37,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:37,564 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 230 proven. 98 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2018-10-24 12:38:37,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:37,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:37,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:37,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:37,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:37,565 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 12:38:37,572 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:37,572 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:37,600 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:38:37,600 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:37,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:37,911 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 28 proven. 231 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2018-10-24 12:38:37,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:38,055 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 4 proven. 57 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2018-10-24 12:38:38,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:38,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 25 [2018-10-24 12:38:38,076 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:38,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:38:38,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:38:38,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:38:38,077 INFO L87 Difference]: Start difference. First operand 215 states and 264 transitions. Second operand 18 states. [2018-10-24 12:38:39,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:39,460 INFO L93 Difference]: Finished difference Result 409 states and 513 transitions. [2018-10-24 12:38:39,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:38:39,460 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 87 [2018-10-24 12:38:39,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:39,462 INFO L225 Difference]: With dead ends: 409 [2018-10-24 12:38:39,462 INFO L226 Difference]: Without dead ends: 263 [2018-10-24 12:38:39,464 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=505, Invalid=2045, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:38:39,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2018-10-24 12:38:39,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 247. [2018-10-24 12:38:39,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-10-24 12:38:39,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 304 transitions. [2018-10-24 12:38:39,478 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 304 transitions. Word has length 87 [2018-10-24 12:38:39,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:39,478 INFO L481 AbstractCegarLoop]: Abstraction has 247 states and 304 transitions. [2018-10-24 12:38:39,478 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:38:39,479 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 304 transitions. [2018-10-24 12:38:39,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-24 12:38:39,480 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:39,480 INFO L375 BasicCegarLoop]: trace histogram [18, 16, 16, 15, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:39,480 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:39,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:39,481 INFO L82 PathProgramCache]: Analyzing trace with hash 220500928, now seen corresponding path program 3 times [2018-10-24 12:38:39,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:39,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:39,482 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:39,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:39,482 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:39,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:39,606 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 294 proven. 128 refuted. 0 times theorem prover too weak. 131 trivial. 0 not checked. [2018-10-24 12:38:39,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:39,606 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:39,606 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:39,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:39,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:39,607 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 12:38:39,620 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:39,620 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:39,638 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:39,638 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:39,641 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:39,877 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 110 proven. 443 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:39,877 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:40,066 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 56 proven. 497 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:40,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:40,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 19, 19] total 36 [2018-10-24 12:38:40,087 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:40,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:38:40,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:38:40,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1043, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:38:40,088 INFO L87 Difference]: Start difference. First operand 247 states and 304 transitions. Second operand 28 states. [2018-10-24 12:38:41,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:41,067 INFO L93 Difference]: Finished difference Result 572 states and 717 transitions. [2018-10-24 12:38:41,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:38:41,069 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 95 [2018-10-24 12:38:41,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:41,072 INFO L225 Difference]: With dead ends: 572 [2018-10-24 12:38:41,072 INFO L226 Difference]: Without dead ends: 402 [2018-10-24 12:38:41,073 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 160 SyntacticMatches, 7 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=229, Invalid=1103, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:38:41,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2018-10-24 12:38:41,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 373. [2018-10-24 12:38:41,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373 states. [2018-10-24 12:38:41,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 445 transitions. [2018-10-24 12:38:41,094 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 445 transitions. Word has length 95 [2018-10-24 12:38:41,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:41,094 INFO L481 AbstractCegarLoop]: Abstraction has 373 states and 445 transitions. [2018-10-24 12:38:41,094 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:38:41,094 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 445 transitions. [2018-10-24 12:38:41,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-24 12:38:41,096 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:41,096 INFO L375 BasicCegarLoop]: trace histogram [20, 18, 18, 17, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:41,096 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:41,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:41,097 INFO L82 PathProgramCache]: Analyzing trace with hash -911767712, now seen corresponding path program 4 times [2018-10-24 12:38:41,097 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:41,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:41,098 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:41,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:41,098 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:41,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:41,241 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 366 proven. 162 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-24 12:38:41,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:41,241 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:41,241 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:41,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:41,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:41,241 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 12:38:41,250 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:41,250 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:41,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:41,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:41,309 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 364 proven. 162 refuted. 0 times theorem prover too weak. 167 trivial. 0 not checked. [2018-10-24 12:38:41,309 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:42,033 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 366 proven. 162 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-24 12:38:42,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:42,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:38:42,054 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:42,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:38:42,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:38:42,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:38:42,056 INFO L87 Difference]: Start difference. First operand 373 states and 445 transitions. Second operand 12 states. [2018-10-24 12:38:42,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:42,170 INFO L93 Difference]: Finished difference Result 729 states and 879 transitions. [2018-10-24 12:38:42,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:38:42,178 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 103 [2018-10-24 12:38:42,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:42,181 INFO L225 Difference]: With dead ends: 729 [2018-10-24 12:38:42,182 INFO L226 Difference]: Without dead ends: 448 [2018-10-24 12:38:42,183 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:38:42,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2018-10-24 12:38:42,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 409. [2018-10-24 12:38:42,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 409 states. [2018-10-24 12:38:42,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 490 transitions. [2018-10-24 12:38:42,210 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 490 transitions. Word has length 103 [2018-10-24 12:38:42,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:42,210 INFO L481 AbstractCegarLoop]: Abstraction has 409 states and 490 transitions. [2018-10-24 12:38:42,210 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:38:42,211 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 490 transitions. [2018-10-24 12:38:42,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-24 12:38:42,213 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:42,213 INFO L375 BasicCegarLoop]: trace histogram [22, 20, 20, 19, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:42,213 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:42,213 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:42,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1728217600, now seen corresponding path program 5 times [2018-10-24 12:38:42,214 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:42,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:42,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:42,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:42,215 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:42,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:43,532 INFO L134 CoverageAnalysis]: Checked inductivity of 849 backedges. 446 proven. 200 refuted. 0 times theorem prover too weak. 203 trivial. 0 not checked. [2018-10-24 12:38:43,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:43,532 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:43,532 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:43,532 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:43,533 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:43,533 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 12:38:43,555 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:43,555 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:43,570 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:38:43,570 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:43,573 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:43,721 INFO L134 CoverageAnalysis]: Checked inductivity of 849 backedges. 40 proven. 447 refuted. 0 times theorem prover too weak. 362 trivial. 0 not checked. [2018-10-24 12:38:43,721 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:43,853 INFO L134 CoverageAnalysis]: Checked inductivity of 849 backedges. 5 proven. 80 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2018-10-24 12:38:43,873 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:43,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 8] total 27 [2018-10-24 12:38:43,874 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:43,874 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:38:43,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:38:43,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=551, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:38:43,875 INFO L87 Difference]: Start difference. First operand 409 states and 490 transitions. Second operand 21 states. [2018-10-24 12:38:44,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:44,750 INFO L93 Difference]: Finished difference Result 968 states and 1173 transitions. [2018-10-24 12:38:44,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:38:44,750 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 111 [2018-10-24 12:38:44,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:44,755 INFO L225 Difference]: With dead ends: 968 [2018-10-24 12:38:44,755 INFO L226 Difference]: Without dead ends: 663 [2018-10-24 12:38:44,757 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=553, Invalid=1897, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:38:44,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 663 states. [2018-10-24 12:38:44,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 663 to 598. [2018-10-24 12:38:44,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 598 states. [2018-10-24 12:38:44,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 598 states to 598 states and 720 transitions. [2018-10-24 12:38:44,781 INFO L78 Accepts]: Start accepts. Automaton has 598 states and 720 transitions. Word has length 111 [2018-10-24 12:38:44,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:44,781 INFO L481 AbstractCegarLoop]: Abstraction has 598 states and 720 transitions. [2018-10-24 12:38:44,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:38:44,782 INFO L276 IsEmpty]: Start isEmpty. Operand 598 states and 720 transitions. [2018-10-24 12:38:44,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-24 12:38:44,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:44,784 INFO L375 BasicCegarLoop]: trace histogram [25, 23, 23, 21, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:44,784 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:44,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:44,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1425162325, now seen corresponding path program 1 times [2018-10-24 12:38:44,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:44,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:44,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:44,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:44,785 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:44,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:44,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1113 backedges. 580 proven. 242 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2018-10-24 12:38:44,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:44,954 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:44,955 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 124 with the following transitions: [2018-10-24 12:38:44,955 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [3], [8], [12], [18], [22], [25], [27], [30], [32], [34], [40], [48], [55], [58], [60], [63], [65], [66], [67], [68], [70], [71], [72], [73] [2018-10-24 12:38:44,956 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:38:44,956 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:38:45,005 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:38:45,006 INFO L272 AbstractInterpreter]: Visited 27 different actions 86 times. Merged at 11 different actions 41 times. Widened at 2 different actions 4 times. Found 13 fixpoints after 5 different actions. Largest state had 8 variables. [2018-10-24 12:38:45,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:45,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:38:45,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:45,042 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 12:38:45,056 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:45,056 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:45,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:45,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:45,110 INFO L134 CoverageAnalysis]: Checked inductivity of 1113 backedges. 578 proven. 242 refuted. 0 times theorem prover too weak. 293 trivial. 0 not checked. [2018-10-24 12:38:45,110 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:45,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1113 backedges. 580 proven. 242 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2018-10-24 12:38:45,405 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:45,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:38:45,405 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:45,406 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:38:45,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:38:45,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:38:45,407 INFO L87 Difference]: Start difference. First operand 598 states and 720 transitions. Second operand 14 states. [2018-10-24 12:38:45,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:45,783 INFO L93 Difference]: Finished difference Result 1165 states and 1412 transitions. [2018-10-24 12:38:45,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:38:45,784 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 123 [2018-10-24 12:38:45,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:45,787 INFO L225 Difference]: With dead ends: 1165 [2018-10-24 12:38:45,787 INFO L226 Difference]: Without dead ends: 683 [2018-10-24 12:38:45,789 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 235 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:38:45,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 683 states. [2018-10-24 12:38:45,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 683 to 634. [2018-10-24 12:38:45,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 634 states. [2018-10-24 12:38:45,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 634 states to 634 states and 765 transitions. [2018-10-24 12:38:45,818 INFO L78 Accepts]: Start accepts. Automaton has 634 states and 765 transitions. Word has length 123 [2018-10-24 12:38:45,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:45,818 INFO L481 AbstractCegarLoop]: Abstraction has 634 states and 765 transitions. [2018-10-24 12:38:45,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:38:45,818 INFO L276 IsEmpty]: Start isEmpty. Operand 634 states and 765 transitions. [2018-10-24 12:38:45,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-24 12:38:45,820 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:45,820 INFO L375 BasicCegarLoop]: trace histogram [26, 24, 24, 22, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:45,820 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:45,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:45,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1006237892, now seen corresponding path program 2 times [2018-10-24 12:38:45,821 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:45,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:45,822 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:45,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:45,822 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:45,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:46,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 630 proven. 288 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2018-10-24 12:38:46,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:46,023 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:46,023 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:46,023 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:46,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:46,023 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 12:38:46,032 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:46,032 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:46,047 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:38:46,047 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:46,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:46,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 48 proven. 631 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-10-24 12:38:46,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:46,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 4 proven. 97 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2018-10-24 12:38:46,411 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:46,411 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 9] total 30 [2018-10-24 12:38:46,411 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:46,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:38:46,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:38:46,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=702, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:38:46,412 INFO L87 Difference]: Start difference. First operand 634 states and 765 transitions. Second operand 23 states. [2018-10-24 12:38:47,628 WARN L179 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 12 [2018-10-24 12:38:48,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:48,434 INFO L93 Difference]: Finished difference Result 1265 states and 1538 transitions. [2018-10-24 12:38:48,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-24 12:38:48,434 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 127 [2018-10-24 12:38:48,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:48,438 INFO L225 Difference]: With dead ends: 1265 [2018-10-24 12:38:48,439 INFO L226 Difference]: Without dead ends: 759 [2018-10-24 12:38:48,442 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1159 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1040, Invalid=3930, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:38:48,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 759 states. [2018-10-24 12:38:48,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 759 to 623. [2018-10-24 12:38:48,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 623 states. [2018-10-24 12:38:48,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 623 states to 623 states and 749 transitions. [2018-10-24 12:38:48,483 INFO L78 Accepts]: Start accepts. Automaton has 623 states and 749 transitions. Word has length 127 [2018-10-24 12:38:48,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:48,484 INFO L481 AbstractCegarLoop]: Abstraction has 623 states and 749 transitions. [2018-10-24 12:38:48,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:38:48,484 INFO L276 IsEmpty]: Start isEmpty. Operand 623 states and 749 transitions. [2018-10-24 12:38:48,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-10-24 12:38:48,488 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:48,488 INFO L375 BasicCegarLoop]: trace histogram [42, 39, 39, 39, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:48,488 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:48,489 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:48,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1712707552, now seen corresponding path program 3 times [2018-10-24 12:38:48,489 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:48,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:48,490 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:48,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:48,490 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:48,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:48,806 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 1468 proven. 338 refuted. 0 times theorem prover too weak. 1421 trivial. 0 not checked. [2018-10-24 12:38:48,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:48,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:48,807 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:48,807 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:48,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:48,807 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 12:38:48,830 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:48,830 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:48,873 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:48,873 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:48,879 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:48,910 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 1464 proven. 338 refuted. 0 times theorem prover too weak. 1425 trivial. 0 not checked. [2018-10-24 12:38:48,910 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:49,549 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 1468 proven. 338 refuted. 0 times theorem prover too weak. 1421 trivial. 0 not checked. [2018-10-24 12:38:49,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:49,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:38:49,570 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:49,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:38:49,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:38:49,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:38:49,572 INFO L87 Difference]: Start difference. First operand 623 states and 749 transitions. Second operand 16 states. [2018-10-24 12:38:49,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:49,875 INFO L93 Difference]: Finished difference Result 1235 states and 1493 transitions. [2018-10-24 12:38:49,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:38:49,878 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 198 [2018-10-24 12:38:49,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:49,882 INFO L225 Difference]: With dead ends: 1235 [2018-10-24 12:38:49,882 INFO L226 Difference]: Without dead ends: 752 [2018-10-24 12:38:49,884 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 383 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:38:49,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 752 states. [2018-10-24 12:38:49,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 752 to 549. [2018-10-24 12:38:49,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 549 states. [2018-10-24 12:38:49,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 549 states to 549 states and 664 transitions. [2018-10-24 12:38:49,920 INFO L78 Accepts]: Start accepts. Automaton has 549 states and 664 transitions. Word has length 198 [2018-10-24 12:38:49,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:49,920 INFO L481 AbstractCegarLoop]: Abstraction has 549 states and 664 transitions. [2018-10-24 12:38:49,921 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:38:49,921 INFO L276 IsEmpty]: Start isEmpty. Operand 549 states and 664 transitions. [2018-10-24 12:38:49,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2018-10-24 12:38:49,923 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:49,924 INFO L375 BasicCegarLoop]: trace histogram [45, 42, 42, 42, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:49,924 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:49,924 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:49,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1061715719, now seen corresponding path program 4 times [2018-10-24 12:38:49,924 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:49,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:49,925 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:49,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:49,926 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:49,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:50,227 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1692 proven. 392 refuted. 0 times theorem prover too weak. 1641 trivial. 0 not checked. [2018-10-24 12:38:50,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:50,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:50,228 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:50,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:50,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:50,228 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 12:38:50,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:50,238 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:50,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:50,281 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:50,316 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1688 proven. 392 refuted. 0 times theorem prover too weak. 1645 trivial. 0 not checked. [2018-10-24 12:38:50,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:50,652 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1692 proven. 392 refuted. 0 times theorem prover too weak. 1641 trivial. 0 not checked. [2018-10-24 12:38:50,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:50,675 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:38:50,675 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:50,675 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:38:50,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:38:50,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:38:50,676 INFO L87 Difference]: Start difference. First operand 549 states and 664 transitions. Second operand 17 states. [2018-10-24 12:38:50,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:50,906 INFO L93 Difference]: Finished difference Result 1021 states and 1242 transitions. [2018-10-24 12:38:50,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:38:50,911 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 210 [2018-10-24 12:38:50,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:50,914 INFO L225 Difference]: With dead ends: 1021 [2018-10-24 12:38:50,914 INFO L226 Difference]: Without dead ends: 624 [2018-10-24 12:38:50,916 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 406 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:38:50,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2018-10-24 12:38:50,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 585. [2018-10-24 12:38:50,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 585 states. [2018-10-24 12:38:50,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 585 states to 585 states and 709 transitions. [2018-10-24 12:38:50,950 INFO L78 Accepts]: Start accepts. Automaton has 585 states and 709 transitions. Word has length 210 [2018-10-24 12:38:50,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:50,951 INFO L481 AbstractCegarLoop]: Abstraction has 585 states and 709 transitions. [2018-10-24 12:38:50,951 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:38:50,951 INFO L276 IsEmpty]: Start isEmpty. Operand 585 states and 709 transitions. [2018-10-24 12:38:50,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-24 12:38:50,954 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:50,954 INFO L375 BasicCegarLoop]: trace histogram [48, 45, 45, 45, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:50,955 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:50,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:50,955 INFO L82 PathProgramCache]: Analyzing trace with hash -1595542674, now seen corresponding path program 5 times [2018-10-24 12:38:50,955 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:50,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:50,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:50,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:50,956 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:50,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:52,321 INFO L134 CoverageAnalysis]: Checked inductivity of 4259 backedges. 1932 proven. 450 refuted. 0 times theorem prover too weak. 1877 trivial. 0 not checked. [2018-10-24 12:38:52,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:52,322 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:52,322 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:52,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:52,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:52,322 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 12:38:52,333 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:52,333 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:52,352 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:38:52,353 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:52,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:52,564 INFO L134 CoverageAnalysis]: Checked inductivity of 4259 backedges. 1998 proven. 1 refuted. 0 times theorem prover too weak. 2260 trivial. 0 not checked. [2018-10-24 12:38:52,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:52,798 INFO L134 CoverageAnalysis]: Checked inductivity of 4259 backedges. 1940 proven. 59 refuted. 0 times theorem prover too weak. 2260 trivial. 0 not checked. [2018-10-24 12:38:52,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:52,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 10, 9] total 30 [2018-10-24 12:38:52,822 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:52,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:38:52,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:38:52,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=646, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:38:52,824 INFO L87 Difference]: Start difference. First operand 585 states and 709 transitions. Second operand 26 states. [2018-10-24 12:38:53,836 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 7 [2018-10-24 12:38:54,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:54,314 INFO L93 Difference]: Finished difference Result 1103 states and 1349 transitions. [2018-10-24 12:38:54,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:38:54,314 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 222 [2018-10-24 12:38:54,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:54,314 INFO L225 Difference]: With dead ends: 1103 [2018-10-24 12:38:54,314 INFO L226 Difference]: Without dead ends: 0 [2018-10-24 12:38:54,317 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 448 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=600, Invalid=1562, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:38:54,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-24 12:38:54,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-24 12:38:54,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-24 12:38:54,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-24 12:38:54,318 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 222 [2018-10-24 12:38:54,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:54,318 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-24 12:38:54,318 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:38:54,319 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-24 12:38:54,319 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-24 12:38:54,324 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-24 12:38:54,745 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,758 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,772 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,782 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,784 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,822 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,829 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,833 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,838 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,871 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,873 WARN L179 SmtUtils]: Spent 535.00 ms on a formula simplification. DAG size of input: 485 DAG size of output: 88 [2018-10-24 12:38:54,909 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:54,910 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-10-24 12:38:55,213 WARN L179 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 7 [2018-10-24 12:38:56,285 WARN L179 SmtUtils]: Spent 1.07 s on a formula simplification. DAG size of input: 90 DAG size of output: 19 [2018-10-24 12:38:56,360 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2018-10-24 12:38:56,360 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: true [2018-10-24 12:38:56,360 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-24 12:38:56,360 INFO L425 ceAbstractionStarter]: For program point nondetFINAL(lines 15 19) no Hoare annotation was computed. [2018-10-24 12:38:56,361 INFO L428 ceAbstractionStarter]: At program point nondetENTRY(lines 15 19) the Hoare annotation is: true [2018-10-24 12:38:56,361 INFO L425 ceAbstractionStarter]: For program point nondetEXIT(lines 15 19) no Hoare annotation was computed. [2018-10-24 12:38:56,361 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-24 12:38:56,361 INFO L421 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: (= ~last~0 0) [2018-10-24 12:38:56,361 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-24 12:38:56,361 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-24 12:38:56,361 INFO L421 ceAbstractionStarter]: At program point L33(lines 24 34) the Hoare annotation is: (or (not (= |old(~last~0)| 0)) (and (= main_~b~0 main_~a~0) (<= 200000 main_~c~0) (<= main_~c~0 200000)) (and (= main_~b~0 0) (= main_~c~0 0) (= main_~a~0 0) (= main_~st~0 0))) [2018-10-24 12:38:56,361 INFO L421 ceAbstractionStarter]: At program point L31-1(lines 31 32) the Hoare annotation is: (or (not (= |old(~last~0)| 0)) (and (= main_~b~0 main_~a~0) (<= 200000 main_~c~0) (<= main_~c~0 200000))) [2018-10-24 12:38:56,361 INFO L425 ceAbstractionStarter]: For program point L27(line 27) no Hoare annotation was computed. [2018-10-24 12:38:56,361 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 21 35) no Hoare annotation was computed. [2018-10-24 12:38:56,361 INFO L421 ceAbstractionStarter]: At program point mainENTRY(lines 21 35) the Hoare annotation is: (or (not (= |old(~last~0)| 0)) (= ~last~0 0)) [2018-10-24 12:38:56,361 INFO L425 ceAbstractionStarter]: For program point L28-1(lines 24 34) no Hoare annotation was computed. [2018-10-24 12:38:56,362 INFO L425 ceAbstractionStarter]: For program point L26-1(lines 26 27) no Hoare annotation was computed. [2018-10-24 12:38:56,362 INFO L425 ceAbstractionStarter]: For program point L24-1(lines 24 34) no Hoare annotation was computed. [2018-10-24 12:38:56,362 INFO L425 ceAbstractionStarter]: For program point L26-3(lines 26 27) no Hoare annotation was computed. [2018-10-24 12:38:56,362 INFO L425 ceAbstractionStarter]: For program point L22(line 22) no Hoare annotation was computed. [2018-10-24 12:38:56,362 INFO L421 ceAbstractionStarter]: At program point L26-4(lines 26 27) the Hoare annotation is: (let ((.cse0 (= main_~b~0 main_~a~0)) (.cse1 (<= main_~c~0 200000))) (or (and .cse0 .cse1 (<= 1 main_~st~0)) (not (= |old(~last~0)| 0)) (and .cse0 .cse1 (<= ~last~0 199999)))) [2018-10-24 12:38:56,362 INFO L425 ceAbstractionStarter]: For program point L26-5(lines 24 34) no Hoare annotation was computed. [2018-10-24 12:38:56,362 INFO L425 ceAbstractionStarter]: For program point L24-3(lines 21 35) no Hoare annotation was computed. [2018-10-24 12:38:56,362 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 10) no Hoare annotation was computed. [2018-10-24 12:38:56,362 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 8 13) the Hoare annotation is: true [2018-10-24 12:38:56,362 INFO L425 ceAbstractionStarter]: For program point L10(line 10) no Hoare annotation was computed. [2018-10-24 12:38:56,363 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 8 13) no Hoare annotation was computed. [2018-10-24 12:38:56,363 INFO L425 ceAbstractionStarter]: For program point L9(lines 9 11) no Hoare annotation was computed. [2018-10-24 12:38:56,363 INFO L425 ceAbstractionStarter]: For program point L9-2(lines 8 13) no Hoare annotation was computed. [2018-10-24 12:38:56,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:38:56 BoogieIcfgContainer [2018-10-24 12:38:56,374 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:38:56,375 INFO L168 Benchmark]: Toolchain (without parser) took 29493.30 ms. Allocated memory was 1.5 GB in the beginning and 2.6 GB in the end (delta: 1.1 GB). Free memory was 1.4 GB in the beginning and 2.4 GB in the end (delta: -972.0 MB). Peak memory consumption was 135.3 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:56,376 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:38:56,376 INFO L168 Benchmark]: CACSL2BoogieTranslator took 279.79 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:56,377 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.52 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:38:56,378 INFO L168 Benchmark]: Boogie Preprocessor took 20.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:38:56,378 INFO L168 Benchmark]: RCFGBuilder took 500.61 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 735.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -778.0 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:56,379 INFO L168 Benchmark]: TraceAbstraction took 28666.72 ms. Allocated memory was 2.3 GB in the beginning and 2.6 GB in the end (delta: 372.2 MB). Free memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: -204.6 MB). Peak memory consumption was 167.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:56,383 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 279.79 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 20.52 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 20.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 500.61 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 735.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -778.0 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 28666.72 ms. Allocated memory was 2.3 GB in the beginning and 2.6 GB in the end (delta: 372.2 MB). Free memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: -204.6 MB). Peak memory consumption was 167.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 10]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 26]: Loop Invariant Derived loop invariant: (((b == a && c <= 200000) && 1 <= st) || !(\old(last) == 0)) || ((b == a && c <= 200000) && last <= 199999) - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: (!(\old(last) == 0) || ((b == a && 200000 <= c) && c <= 200000)) || (((b == 0 && c == 0) && a == 0) && st == 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 29 locations, 1 error locations. SAFE Result, 28.5s OverallTime, 23 OverallIterations, 48 TraceHistogramMax, 10.7s AutomataDifference, 0.0s DeadEndRemovalTime, 2.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 641 SDtfs, 1090 SDslu, 4052 SDs, 0 SdLazy, 3549 SolverSat, 155 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.9s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 3685 GetRequests, 3193 SyntacticMatches, 13 SemanticMatches, 479 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3599 ImplicationChecksByTransitivity, 14.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=634occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.8s AbstIntTime, 7 AbstIntIterations, 1 AbstIntStrong, 0.7978260869565218 AbsIntWeakeningRatio, 0.6086956521739131 AbsIntAvgWeakeningVarsNumRemoved, 0.6956521739130435 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 23 MinimizatonAttempts, 687 StatesRemovedByMinimization, 20 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 93 PreInvPairs, 264 NumberOfFragments, 83 HoareAnnotationTreeSize, 93 FomulaSimplifications, 59958 FormulaSimplificationTreeSizeReduction, 0.5s HoareSimplificationTime, 9 FomulaSimplificationsInter, 465 FormulaSimplificationTreeSizeReductionInter, 1.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 12.3s InterpolantComputationTime, 3461 NumberOfCodeBlocks, 2973 NumberOfCodeBlocksAsserted, 50 NumberOfCheckSat, 5071 ConstructedInterpolants, 0 QuantifiedInterpolants, 1400661 SizeOfPredicates, 57 NumberOfNonLiveVariables, 2250 ConjunctsInSsa, 261 ConjunctsInUnsatCore, 59 InterpolantComputations, 8 PerfectInterpolantSequences, 42768/50566 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...