java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call3_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:14:24,992 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:14:24,994 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:14:25,006 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:14:25,006 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:14:25,007 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:14:25,008 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:14:25,010 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:14:25,012 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:14:25,013 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:14:25,014 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:14:25,014 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:14:25,015 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:14:25,016 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:14:25,017 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:14:25,017 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:14:25,018 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:14:25,020 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:14:25,022 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:14:25,023 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:14:25,024 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:14:25,025 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:14:25,027 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:14:25,027 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:14:25,028 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:14:25,029 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:14:25,029 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:14:25,030 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:14:25,031 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:14:25,032 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:14:25,032 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:14:25,033 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:14:25,033 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:14:25,033 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:14:25,034 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:14:25,035 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:14:25,035 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:14:25,050 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:14:25,050 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:14:25,051 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:14:25,051 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:14:25,051 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:14:25,051 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:14:25,052 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:14:25,052 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:14:25,052 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:14:25,052 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:14:25,052 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:14:25,053 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:14:25,053 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:14:25,053 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:14:25,054 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:14:25,054 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:14:25,054 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:14:25,054 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:14:25,054 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:14:25,054 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:14:25,055 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:14:25,055 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:14:25,055 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:14:25,055 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:14:25,055 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:14:25,056 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:14:25,056 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:14:25,056 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:14:25,056 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:14:25,056 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:14:25,057 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:14:25,057 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:14:25,057 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:14:25,057 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:14:25,099 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:14:25,115 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:14:25,119 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:14:25,121 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:14:25,121 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:14:25,122 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call3_true-termination.i [2018-10-24 12:14:25,182 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/df86d8246/525b77a4091142319e7d8cf2788b8eef/FLAG3b12f9c32 [2018-10-24 12:14:25,607 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:14:25,607 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call3_true-termination.i [2018-10-24 12:14:25,613 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/df86d8246/525b77a4091142319e7d8cf2788b8eef/FLAG3b12f9c32 [2018-10-24 12:14:25,627 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/df86d8246/525b77a4091142319e7d8cf2788b8eef [2018-10-24 12:14:25,638 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:14:25,640 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:14:25,641 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:14:25,641 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:14:25,645 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:14:25,646 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:25,648 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1816ef0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25, skipping insertion in model container [2018-10-24 12:14:25,649 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:25,659 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:14:25,685 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:14:25,920 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:14:25,924 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:14:25,950 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:14:25,969 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:14:25,970 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25 WrapperNode [2018-10-24 12:14:25,970 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:14:25,970 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:14:25,971 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:14:25,971 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:14:25,979 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:25,988 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:26,009 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:14:26,010 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:14:26,010 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:14:26,010 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:14:26,019 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:26,019 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:26,021 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:26,021 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:26,026 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:26,031 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:26,032 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... [2018-10-24 12:14:26,034 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:14:26,035 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:14:26,035 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:14:26,035 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:14:26,036 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:14:26,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:14:26,165 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:14:26,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:14:26,165 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:14:26,166 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:14:26,166 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:14:26,166 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:14:26,166 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:14:26,487 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:14:26,488 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:14:26 BoogieIcfgContainer [2018-10-24 12:14:26,488 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:14:26,490 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:14:26,490 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:14:26,494 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:14:26,494 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:14:25" (1/3) ... [2018-10-24 12:14:26,495 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3045f83d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:14:26, skipping insertion in model container [2018-10-24 12:14:26,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:25" (2/3) ... [2018-10-24 12:14:26,496 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3045f83d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:14:26, skipping insertion in model container [2018-10-24 12:14:26,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:14:26" (3/3) ... [2018-10-24 12:14:26,499 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_true-unreach-call3_true-termination.i [2018-10-24 12:14:26,512 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:14:26,532 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:14:26,571 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:14:26,604 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:14:26,604 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:14:26,604 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:14:26,605 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:14:26,605 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:14:26,605 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:14:26,605 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:14:26,605 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:14:26,622 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2018-10-24 12:14:26,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:14:26,627 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:26,628 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:26,630 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:26,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:26,636 INFO L82 PathProgramCache]: Analyzing trace with hash 974464032, now seen corresponding path program 1 times [2018-10-24 12:14:26,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:26,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:26,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:26,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:26,684 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:26,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:26,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:26,768 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:14:26,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:14:26,769 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:14:26,773 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:14:26,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:14:26,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:14:26,790 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2018-10-24 12:14:26,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:26,812 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2018-10-24 12:14:26,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:14:26,813 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-10-24 12:14:26,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:26,822 INFO L225 Difference]: With dead ends: 44 [2018-10-24 12:14:26,823 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 12:14:26,826 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:14:26,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 12:14:26,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-24 12:14:26,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:14:26,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-10-24 12:14:26,860 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2018-10-24 12:14:26,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:26,861 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-10-24 12:14:26,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:14:26,861 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-10-24 12:14:26,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:14:26,862 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:26,862 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:26,862 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:26,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:26,863 INFO L82 PathProgramCache]: Analyzing trace with hash 984975661, now seen corresponding path program 1 times [2018-10-24 12:14:26,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:26,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:26,864 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:26,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:26,864 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:26,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:26,949 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:26,949 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:14:26,949 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:14:26,949 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:14:26,951 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:14:26,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:14:26,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:14:26,952 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 3 states. [2018-10-24 12:14:27,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:27,055 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2018-10-24 12:14:27,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:14:27,056 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-10-24 12:14:27,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:27,059 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:14:27,059 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 12:14:27,060 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:14:27,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 12:14:27,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2018-10-24 12:14:27,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:14:27,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2018-10-24 12:14:27,070 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2018-10-24 12:14:27,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:27,071 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2018-10-24 12:14:27,071 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:14:27,071 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2018-10-24 12:14:27,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-24 12:14:27,072 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:27,072 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:27,073 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:27,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:27,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1246878611, now seen corresponding path program 1 times [2018-10-24 12:14:27,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:27,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:27,075 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:27,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:27,075 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:27,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:27,220 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:27,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:27,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:27,222 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-24 12:14:27,224 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [13], [15], [19], [23], [28], [33], [44], [47], [49], [55], [56], [57], [59] [2018-10-24 12:14:27,276 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:14:27,276 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:14:27,454 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:14:30,241 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:14:30,243 INFO L272 AbstractInterpreter]: Visited 17 different actions 317 times. Merged at 7 different actions 192 times. Widened at 2 different actions 48 times. Found 3 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-24 12:14:30,296 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:30,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:14:30,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:30,298 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:30,318 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:30,318 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:30,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:30,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:30,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:30,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:30,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:30,823 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:30,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:14:30,823 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:30,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:14:30,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:14:30,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:14:30,825 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 4 states. [2018-10-24 12:14:31,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:31,163 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2018-10-24 12:14:31,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:14:31,165 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2018-10-24 12:14:31,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:31,166 INFO L225 Difference]: With dead ends: 50 [2018-10-24 12:14:31,166 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:14:31,167 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:14:31,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:14:31,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 25. [2018-10-24 12:14:31,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-24 12:14:31,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-10-24 12:14:31,179 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 18 [2018-10-24 12:14:31,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:31,179 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-10-24 12:14:31,180 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:14:31,181 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-10-24 12:14:31,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:14:31,182 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:31,182 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:31,182 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:31,182 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:31,183 INFO L82 PathProgramCache]: Analyzing trace with hash -467456903, now seen corresponding path program 2 times [2018-10-24 12:14:31,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:31,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:31,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:31,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:31,185 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:31,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:31,486 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:31,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:31,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:31,488 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:31,489 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:31,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:31,489 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:31,506 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:31,507 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:31,570 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:14:31,570 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:31,573 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:31,633 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:31,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:31,784 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:31,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:31,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:14:31,809 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:31,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:14:31,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:14:31,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:14:31,810 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2018-10-24 12:14:31,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:31,980 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2018-10-24 12:14:31,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:14:31,982 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2018-10-24 12:14:31,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:31,983 INFO L225 Difference]: With dead ends: 58 [2018-10-24 12:14:31,983 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:14:31,984 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:14:31,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:14:31,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 27. [2018-10-24 12:14:31,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:14:31,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-10-24 12:14:31,990 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 20 [2018-10-24 12:14:31,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:31,990 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-10-24 12:14:31,990 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:14:31,990 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-10-24 12:14:31,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-24 12:14:31,991 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:31,991 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:31,991 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:31,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:31,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1323555807, now seen corresponding path program 3 times [2018-10-24 12:14:31,992 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:31,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:31,993 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:31,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:31,993 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:32,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:32,095 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:32,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:32,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:32,096 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:32,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:32,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:32,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:32,113 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:14:32,113 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:14:32,168 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:14:32,168 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:32,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:32,220 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:32,220 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:32,573 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:32,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:32,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:14:32,605 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:32,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:14:32,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:14:32,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:14:32,606 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 6 states. [2018-10-24 12:14:32,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:32,843 INFO L93 Difference]: Finished difference Result 66 states and 78 transitions. [2018-10-24 12:14:32,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:14:32,850 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2018-10-24 12:14:32,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:32,851 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:14:32,851 INFO L226 Difference]: Without dead ends: 53 [2018-10-24 12:14:32,855 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:14:32,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-24 12:14:32,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 29. [2018-10-24 12:14:32,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:14:32,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-24 12:14:32,865 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2018-10-24 12:14:32,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:32,865 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-24 12:14:32,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:14:32,865 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-24 12:14:32,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:14:32,866 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:32,866 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:32,866 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:32,867 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:32,867 INFO L82 PathProgramCache]: Analyzing trace with hash 204884421, now seen corresponding path program 4 times [2018-10-24 12:14:32,867 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:32,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:32,871 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:32,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:32,871 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:32,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:33,069 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:33,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:33,069 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:33,070 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:33,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:33,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:33,070 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:33,078 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:33,078 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:33,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:33,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:33,158 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:33,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:33,275 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:33,296 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:33,296 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:14:33,296 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:33,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:14:33,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:14:33,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:14:33,297 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 7 states. [2018-10-24 12:14:33,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:33,507 INFO L93 Difference]: Finished difference Result 74 states and 88 transitions. [2018-10-24 12:14:33,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:14:33,507 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2018-10-24 12:14:33,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:33,509 INFO L225 Difference]: With dead ends: 74 [2018-10-24 12:14:33,509 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:14:33,510 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:14:33,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:14:33,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 31. [2018-10-24 12:14:33,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-24 12:14:33,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-10-24 12:14:33,516 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 24 [2018-10-24 12:14:33,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:33,516 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-10-24 12:14:33,517 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:14:33,517 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-10-24 12:14:33,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:14:33,518 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:33,518 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:33,518 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:33,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:33,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1096493525, now seen corresponding path program 5 times [2018-10-24 12:14:33,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:33,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:33,519 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:33,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:33,519 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:33,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:33,875 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:33,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:33,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:33,876 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:33,876 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:33,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:33,877 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:33,892 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:33,892 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:34,051 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:14:34,051 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:34,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:34,082 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:34,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:34,216 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:34,237 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:34,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:14:34,238 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:34,238 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:14:34,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:14:34,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:14:34,239 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 8 states. [2018-10-24 12:14:34,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:34,478 INFO L93 Difference]: Finished difference Result 82 states and 98 transitions. [2018-10-24 12:14:34,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:14:34,478 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-24 12:14:34,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:34,479 INFO L225 Difference]: With dead ends: 82 [2018-10-24 12:14:34,479 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:14:34,480 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:14:34,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:14:34,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 33. [2018-10-24 12:14:34,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:14:34,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-24 12:14:34,487 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 26 [2018-10-24 12:14:34,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:34,487 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-24 12:14:34,487 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:14:34,487 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-24 12:14:34,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 12:14:34,488 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:34,488 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:34,489 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:34,489 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:34,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1885216495, now seen corresponding path program 6 times [2018-10-24 12:14:34,489 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:34,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:34,490 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:34,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:34,490 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:34,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:35,145 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:35,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:35,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:35,145 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:35,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:35,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:35,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:35,153 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:14:35,153 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:14:35,185 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:14:35,186 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:35,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:35,197 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:35,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:35,405 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:35,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:35,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:14:35,428 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:35,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:14:35,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:14:35,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:14:35,429 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 9 states. [2018-10-24 12:14:35,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:35,806 INFO L93 Difference]: Finished difference Result 90 states and 108 transitions. [2018-10-24 12:14:35,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:14:35,807 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-24 12:14:35,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:35,808 INFO L225 Difference]: With dead ends: 90 [2018-10-24 12:14:35,808 INFO L226 Difference]: Without dead ends: 77 [2018-10-24 12:14:35,808 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:14:35,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-24 12:14:35,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 35. [2018-10-24 12:14:35,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:14:35,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-24 12:14:35,819 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2018-10-24 12:14:35,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:35,819 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-24 12:14:35,819 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:14:35,819 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-24 12:14:35,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-24 12:14:35,820 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:35,821 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:35,821 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:35,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:35,821 INFO L82 PathProgramCache]: Analyzing trace with hash 361220727, now seen corresponding path program 7 times [2018-10-24 12:14:35,821 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:35,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:35,822 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:35,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:35,822 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:35,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:36,067 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:36,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:36,068 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:36,068 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:36,069 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:36,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:36,069 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:36,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:36,076 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:36,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:36,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:36,146 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:36,147 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:36,365 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:36,386 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:36,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:14:36,386 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:36,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:14:36,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:14:36,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:14:36,388 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 10 states. [2018-10-24 12:14:36,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:36,874 INFO L93 Difference]: Finished difference Result 98 states and 118 transitions. [2018-10-24 12:14:36,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:14:36,875 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2018-10-24 12:14:36,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:36,876 INFO L225 Difference]: With dead ends: 98 [2018-10-24 12:14:36,876 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:14:36,877 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:14:36,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:14:36,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 37. [2018-10-24 12:14:36,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-24 12:14:36,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2018-10-24 12:14:36,883 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 30 [2018-10-24 12:14:36,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:36,883 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2018-10-24 12:14:36,884 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:14:36,884 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2018-10-24 12:14:36,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:14:36,884 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:36,885 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:36,885 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:36,885 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:36,885 INFO L82 PathProgramCache]: Analyzing trace with hash -1181158819, now seen corresponding path program 8 times [2018-10-24 12:14:36,885 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:36,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:36,886 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:36,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:36,886 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:36,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:37,197 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:37,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:37,198 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:37,198 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:37,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:37,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:37,199 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:37,209 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:37,209 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:40,858 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:14:40,858 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:40,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:40,889 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:40,889 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:41,144 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:41,167 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:41,167 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:14:41,167 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:41,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:14:41,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:14:41,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:14:41,168 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 11 states. [2018-10-24 12:14:41,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:41,751 INFO L93 Difference]: Finished difference Result 106 states and 128 transitions. [2018-10-24 12:14:41,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:14:41,751 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2018-10-24 12:14:41,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:41,752 INFO L225 Difference]: With dead ends: 106 [2018-10-24 12:14:41,752 INFO L226 Difference]: Without dead ends: 93 [2018-10-24 12:14:41,753 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:14:41,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-24 12:14:41,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 39. [2018-10-24 12:14:41,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:14:41,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2018-10-24 12:14:41,761 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 32 [2018-10-24 12:14:41,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:41,761 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2018-10-24 12:14:41,761 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:14:41,761 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2018-10-24 12:14:41,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 12:14:41,763 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:41,763 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:41,763 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:41,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:41,763 INFO L82 PathProgramCache]: Analyzing trace with hash -1644185405, now seen corresponding path program 9 times [2018-10-24 12:14:41,763 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:41,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:41,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:41,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:41,765 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:41,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:42,367 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:42,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:42,368 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:42,368 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:42,368 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:42,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:42,368 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:42,375 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:14:42,375 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:14:42,427 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:14:42,427 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:42,430 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:42,479 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:42,480 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:42,812 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:42,832 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:42,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:14:42,833 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:42,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:14:42,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:14:42,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:14:42,835 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 12 states. [2018-10-24 12:14:43,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:43,441 INFO L93 Difference]: Finished difference Result 114 states and 138 transitions. [2018-10-24 12:14:43,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:14:43,441 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2018-10-24 12:14:43,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:43,443 INFO L225 Difference]: With dead ends: 114 [2018-10-24 12:14:43,444 INFO L226 Difference]: Without dead ends: 101 [2018-10-24 12:14:43,444 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:14:43,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-10-24 12:14:43,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 41. [2018-10-24 12:14:43,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 12:14:43,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-24 12:14:43,451 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 34 [2018-10-24 12:14:43,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:43,452 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-24 12:14:43,452 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:14:43,452 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-24 12:14:43,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-24 12:14:43,453 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:43,453 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:43,453 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:43,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:43,454 INFO L82 PathProgramCache]: Analyzing trace with hash 63864233, now seen corresponding path program 10 times [2018-10-24 12:14:43,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:43,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:43,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:43,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:43,455 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:43,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:44,063 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:44,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:44,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:44,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:44,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:44,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:44,064 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 12:14:44,072 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:44,072 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:44,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:44,123 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:44,150 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:44,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:44,757 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:44,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:44,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:14:44,778 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:44,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:14:44,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:14:44,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:14:44,779 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 13 states. [2018-10-24 12:14:45,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:45,842 INFO L93 Difference]: Finished difference Result 122 states and 148 transitions. [2018-10-24 12:14:45,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:14:45,843 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2018-10-24 12:14:45,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:45,845 INFO L225 Difference]: With dead ends: 122 [2018-10-24 12:14:45,845 INFO L226 Difference]: Without dead ends: 109 [2018-10-24 12:14:45,846 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:14:45,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-24 12:14:45,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 43. [2018-10-24 12:14:45,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-24 12:14:45,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2018-10-24 12:14:45,853 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 36 [2018-10-24 12:14:45,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:45,853 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2018-10-24 12:14:45,853 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:14:45,853 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2018-10-24 12:14:45,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-24 12:14:45,854 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:45,854 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:45,855 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:45,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:45,855 INFO L82 PathProgramCache]: Analyzing trace with hash 822059279, now seen corresponding path program 11 times [2018-10-24 12:14:45,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:45,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:45,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:45,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:45,856 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:45,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:46,119 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:46,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:46,120 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:46,120 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:46,120 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:46,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:46,120 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 12:14:46,127 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:46,128 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:00,713 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:16:00,713 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:00,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:00,802 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:00,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:01,185 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:01,191 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:01,191 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:16:01,191 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:01,192 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:16:01,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:16:01,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:16:01,193 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 14 states. [2018-10-24 12:16:01,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:01,990 INFO L93 Difference]: Finished difference Result 130 states and 158 transitions. [2018-10-24 12:16:01,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:16:01,992 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2018-10-24 12:16:01,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:01,993 INFO L225 Difference]: With dead ends: 130 [2018-10-24 12:16:01,993 INFO L226 Difference]: Without dead ends: 117 [2018-10-24 12:16:01,994 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:16:01,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-24 12:16:01,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 45. [2018-10-24 12:16:02,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-24 12:16:02,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2018-10-24 12:16:02,000 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 38 [2018-10-24 12:16:02,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:02,001 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2018-10-24 12:16:02,001 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:16:02,001 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2018-10-24 12:16:02,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 12:16:02,002 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:02,002 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:02,002 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:02,002 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:02,002 INFO L82 PathProgramCache]: Analyzing trace with hash -696941835, now seen corresponding path program 12 times [2018-10-24 12:16:02,002 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:02,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:02,003 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:02,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:02,003 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:02,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:02,269 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:02,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:02,270 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:02,270 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:02,270 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:02,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:02,270 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 12:16:02,283 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:02,283 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:02,333 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:02,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:02,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:02,376 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:02,376 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:02,946 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:02,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:02,971 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:16:02,971 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:02,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:16:02,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:16:02,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:16:02,972 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 15 states. [2018-10-24 12:16:03,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:03,976 INFO L93 Difference]: Finished difference Result 138 states and 168 transitions. [2018-10-24 12:16:03,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:16:03,977 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2018-10-24 12:16:03,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:03,978 INFO L225 Difference]: With dead ends: 138 [2018-10-24 12:16:03,978 INFO L226 Difference]: Without dead ends: 125 [2018-10-24 12:16:03,979 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:16:03,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2018-10-24 12:16:03,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 47. [2018-10-24 12:16:03,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 12:16:03,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2018-10-24 12:16:03,986 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 40 [2018-10-24 12:16:03,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:03,986 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2018-10-24 12:16:03,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:16:03,986 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2018-10-24 12:16:03,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-24 12:16:03,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:03,987 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:03,987 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:03,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:03,988 INFO L82 PathProgramCache]: Analyzing trace with hash -168131749, now seen corresponding path program 13 times [2018-10-24 12:16:03,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:03,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:03,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:03,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:03,989 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:04,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:04,854 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:04,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:04,854 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:04,854 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:04,855 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:04,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:04,855 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 12:16:04,863 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:04,864 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:04,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:04,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:04,957 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:04,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:05,512 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:05,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:05,534 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:16:05,534 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:05,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:16:05,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:16:05,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:16:05,536 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 16 states. [2018-10-24 12:16:06,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:06,386 INFO L93 Difference]: Finished difference Result 146 states and 178 transitions. [2018-10-24 12:16:06,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:16:06,390 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-10-24 12:16:06,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:06,391 INFO L225 Difference]: With dead ends: 146 [2018-10-24 12:16:06,391 INFO L226 Difference]: Without dead ends: 133 [2018-10-24 12:16:06,392 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:16:06,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-24 12:16:06,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 49. [2018-10-24 12:16:06,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-24 12:16:06,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2018-10-24 12:16:06,398 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 42 [2018-10-24 12:16:06,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:06,398 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2018-10-24 12:16:06,398 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:16:06,399 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2018-10-24 12:16:06,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:16:06,399 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:06,399 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:06,400 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:06,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:06,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1212219969, now seen corresponding path program 14 times [2018-10-24 12:16:06,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:06,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:06,401 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:06,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:06,401 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:06,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:07,272 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:07,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:07,272 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:07,272 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:07,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:07,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:07,272 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 12:16:07,280 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:07,280 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:24,039 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:18:24,039 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:24,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:24,087 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:24,088 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:24,717 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:24,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:24,741 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:18:24,741 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:24,741 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:18:24,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:18:24,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:18:24,743 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 17 states. [2018-10-24 12:18:25,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:25,728 INFO L93 Difference]: Finished difference Result 154 states and 188 transitions. [2018-10-24 12:18:25,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:18:25,729 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2018-10-24 12:18:25,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:25,730 INFO L225 Difference]: With dead ends: 154 [2018-10-24 12:18:25,730 INFO L226 Difference]: Without dead ends: 141 [2018-10-24 12:18:25,731 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:18:25,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-24 12:18:25,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 51. [2018-10-24 12:18:25,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-24 12:18:25,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2018-10-24 12:18:25,738 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 44 [2018-10-24 12:18:25,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:25,738 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2018-10-24 12:18:25,739 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:18:25,739 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2018-10-24 12:18:25,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:18:25,740 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:25,740 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:25,740 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:25,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:25,740 INFO L82 PathProgramCache]: Analyzing trace with hash 585326503, now seen corresponding path program 15 times [2018-10-24 12:18:25,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:25,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:25,741 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:25,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:25,745 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:25,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:26,170 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:26,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:26,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:26,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:26,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:26,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:26,171 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 12:18:26,179 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:26,179 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:26,235 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:26,235 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:26,237 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:26,255 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:26,256 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:26,960 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:26,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:26,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-24 12:18:26,984 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:26,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:18:26,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:18:26,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:18:26,986 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 18 states. [2018-10-24 12:18:28,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:28,228 INFO L93 Difference]: Finished difference Result 162 states and 198 transitions. [2018-10-24 12:18:28,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:18:28,228 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2018-10-24 12:18:28,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:28,230 INFO L225 Difference]: With dead ends: 162 [2018-10-24 12:18:28,230 INFO L226 Difference]: Without dead ends: 149 [2018-10-24 12:18:28,231 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:18:28,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-10-24 12:18:28,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 53. [2018-10-24 12:18:28,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 12:18:28,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2018-10-24 12:18:28,241 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 46 [2018-10-24 12:18:28,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:28,242 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2018-10-24 12:18:28,242 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:18:28,242 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2018-10-24 12:18:28,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-10-24 12:18:28,243 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:28,243 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:28,243 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:28,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:28,243 INFO L82 PathProgramCache]: Analyzing trace with hash -563872883, now seen corresponding path program 16 times [2018-10-24 12:18:28,244 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:28,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:28,244 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:28,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:28,245 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:28,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:28,642 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:28,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:28,643 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:28,643 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:28,643 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:28,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:28,643 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 12:18:28,650 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:28,650 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:28,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:28,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:28,728 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:28,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:29,531 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:29,552 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:29,552 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:18:29,552 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:29,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:18:29,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:18:29,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:18:29,553 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 19 states. [2018-10-24 12:18:30,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:30,777 INFO L93 Difference]: Finished difference Result 170 states and 208 transitions. [2018-10-24 12:18:30,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:18:30,778 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2018-10-24 12:18:30,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:30,780 INFO L225 Difference]: With dead ends: 170 [2018-10-24 12:18:30,780 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:18:30,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:18:30,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:18:30,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 55. [2018-10-24 12:18:30,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-24 12:18:30,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2018-10-24 12:18:30,788 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 48 [2018-10-24 12:18:30,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:30,788 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2018-10-24 12:18:30,788 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:18:30,788 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2018-10-24 12:18:30,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-24 12:18:30,789 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:30,789 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:30,789 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:30,790 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:30,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1137887757, now seen corresponding path program 17 times [2018-10-24 12:18:30,790 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:30,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:30,791 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:30,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:30,791 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:30,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:31,165 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:31,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:31,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:31,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:31,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:31,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:31,166 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 12:18:31,174 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:31,174 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown