java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-63daa26 [2018-11-12 20:42:08,661 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-12 20:42:08,663 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-12 20:42:08,679 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-12 20:42:08,680 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-12 20:42:08,681 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-12 20:42:08,682 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-12 20:42:08,684 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-12 20:42:08,686 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-12 20:42:08,687 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-12 20:42:08,688 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-12 20:42:08,688 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-12 20:42:08,689 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-12 20:42:08,690 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-12 20:42:08,692 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-12 20:42:08,693 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-12 20:42:08,693 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-12 20:42:08,695 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-12 20:42:08,698 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-12 20:42:08,699 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-12 20:42:08,701 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-12 20:42:08,702 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-12 20:42:08,704 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-12 20:42:08,705 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-12 20:42:08,705 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-12 20:42:08,706 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-12 20:42:08,707 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-12 20:42:08,708 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-12 20:42:08,709 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-12 20:42:08,710 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-12 20:42:08,711 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-12 20:42:08,712 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-12 20:42:08,712 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-12 20:42:08,712 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-12 20:42:08,713 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-12 20:42:08,714 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-12 20:42:08,714 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf [2018-11-12 20:42:08,731 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-12 20:42:08,731 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-12 20:42:08,733 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-12 20:42:08,734 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-12 20:42:08,734 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-12 20:42:08,734 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-12 20:42:08,734 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-12 20:42:08,735 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-12 20:42:08,735 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-12 20:42:08,735 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-12 20:42:08,735 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-12 20:42:08,736 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-12 20:42:08,736 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-12 20:42:08,738 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-12 20:42:08,738 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-12 20:42:08,738 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-12 20:42:08,738 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-12 20:42:08,739 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-12 20:42:08,739 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-12 20:42:08,739 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-12 20:42:08,739 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-12 20:42:08,739 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-12 20:42:08,739 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-12 20:42:08,740 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-12 20:42:08,741 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-12 20:42:08,741 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-12 20:42:08,741 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-12 20:42:08,741 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-12 20:42:08,741 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-12 20:42:08,742 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-12 20:42:08,742 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-12 20:42:08,743 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-12 20:42:08,743 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-12 20:42:08,743 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-12 20:42:08,743 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-12 20:42:08,797 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-12 20:42:08,812 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-12 20:42:08,815 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-12 20:42:08,816 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-12 20:42:08,817 INFO L276 PluginConnector]: CDTParser initialized [2018-11-12 20:42:08,817 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-11-12 20:42:08,882 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6766a622f/8fd44e2d2e5b4a89a9e9bd00a5128f9c/FLAG321118a27 [2018-11-12 20:42:09,344 INFO L298 CDTParser]: Found 1 translation units. [2018-11-12 20:42:09,345 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-11-12 20:42:09,354 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6766a622f/8fd44e2d2e5b4a89a9e9bd00a5128f9c/FLAG321118a27 [2018-11-12 20:42:09,374 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6766a622f/8fd44e2d2e5b4a89a9e9bd00a5128f9c [2018-11-12 20:42:09,386 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-12 20:42:09,388 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-12 20:42:09,390 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-12 20:42:09,390 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-12 20:42:09,396 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-12 20:42:09,398 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,401 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fab7844 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09, skipping insertion in model container [2018-11-12 20:42:09,401 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,411 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-12 20:42:09,438 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-12 20:42:09,624 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-12 20:42:09,628 INFO L189 MainTranslator]: Completed pre-run [2018-11-12 20:42:09,645 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-12 20:42:09,658 INFO L193 MainTranslator]: Completed translation [2018-11-12 20:42:09,659 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09 WrapperNode [2018-11-12 20:42:09,659 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-12 20:42:09,660 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-12 20:42:09,661 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-12 20:42:09,661 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-12 20:42:09,670 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,678 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,685 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-12 20:42:09,685 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-12 20:42:09,685 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-12 20:42:09,685 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-12 20:42:09,695 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,696 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,696 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,700 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,705 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,706 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... [2018-11-12 20:42:09,707 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-12 20:42:09,708 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-12 20:42:09,708 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-12 20:42:09,708 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-12 20:42:09,709 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-12 20:42:09,841 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-12 20:42:09,841 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-12 20:42:09,842 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-12 20:42:09,842 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-12 20:42:09,842 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-12 20:42:09,842 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-12 20:42:09,842 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-12 20:42:09,842 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-12 20:42:10,069 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-12 20:42:10,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 08:42:10 BoogieIcfgContainer [2018-11-12 20:42:10,070 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-12 20:42:10,071 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-12 20:42:10,071 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-12 20:42:10,085 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-12 20:42:10,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 08:42:09" (1/3) ... [2018-11-12 20:42:10,088 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6def7a21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 08:42:10, skipping insertion in model container [2018-11-12 20:42:10,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:42:09" (2/3) ... [2018-11-12 20:42:10,089 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6def7a21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 08:42:10, skipping insertion in model container [2018-11-12 20:42:10,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 08:42:10" (3/3) ... [2018-11-12 20:42:10,095 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k_true-unreach-call_true-termination.i [2018-11-12 20:42:10,109 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-12 20:42:10,120 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-12 20:42:10,143 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-12 20:42:10,217 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-12 20:42:10,217 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-12 20:42:10,217 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-12 20:42:10,217 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-12 20:42:10,217 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-12 20:42:10,218 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-12 20:42:10,218 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-12 20:42:10,218 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-12 20:42:10,238 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-12 20:42:10,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-12 20:42:10,245 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:10,246 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:10,249 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:10,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:10,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1152414567, now seen corresponding path program 1 times [2018-11-12 20:42:10,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:10,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:10,302 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:10,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:10,302 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:10,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:10,363 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:10,365 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-12 20:42:10,365 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-12 20:42:10,365 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-12 20:42:10,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-12 20:42:10,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-12 20:42:10,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-12 20:42:10,384 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-12 20:42:10,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:10,409 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-11-12 20:42:10,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-12 20:42:10,410 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-11-12 20:42:10,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:10,419 INFO L225 Difference]: With dead ends: 33 [2018-11-12 20:42:10,420 INFO L226 Difference]: Without dead ends: 14 [2018-11-12 20:42:10,424 INFO L604 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 [2018-11-12 20:42:10,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-12 20:42:10,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-12 20:42:10,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-12 20:42:10,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-11-12 20:42:10,465 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-11-12 20:42:10,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:10,465 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-11-12 20:42:10,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-12 20:42:10,466 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-11-12 20:42:10,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-11-12 20:42:10,467 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:10,467 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:10,467 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:10,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:10,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1083883255, now seen corresponding path program 1 times [2018-11-12 20:42:10,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:10,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:10,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:10,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:10,470 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:10,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:10,661 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 5 [2018-11-12 20:42:10,860 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 7 [2018-11-12 20:42:10,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:10,907 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-12 20:42:10,907 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-12 20:42:10,908 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-12 20:42:10,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-12 20:42:10,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-12 20:42:10,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-12 20:42:10,911 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-11-12 20:42:11,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:11,057 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-11-12 20:42:11,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-12 20:42:11,058 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2018-11-12 20:42:11,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:11,059 INFO L225 Difference]: With dead ends: 21 [2018-11-12 20:42:11,060 INFO L226 Difference]: Without dead ends: 16 [2018-11-12 20:42:11,061 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-11-12 20:42:11,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-12 20:42:11,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-12 20:42:11,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-12 20:42:11,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-11-12 20:42:11,066 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2018-11-12 20:42:11,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:11,066 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-11-12 20:42:11,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-12 20:42:11,067 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-11-12 20:42:11,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-12 20:42:11,068 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:11,068 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:11,068 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:11,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:11,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1128913667, now seen corresponding path program 1 times [2018-11-12 20:42:11,069 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:11,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:11,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:11,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:11,071 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:11,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:11,185 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:11,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:11,186 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:11,187 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-11-12 20:42:11,189 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-12 20:42:11,221 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-12 20:42:11,222 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-12 20:42:11,473 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-12 20:42:11,475 INFO L272 AbstractInterpreter]: Visited 14 different actions 62 times. Merged at 4 different actions 24 times. Widened at 1 different actions 2 times. Performed 132 root evaluator evaluations with a maximum evaluation depth of 5. Performed 132 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-11-12 20:42:11,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:11,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-12 20:42:11,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:11,487 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:42:11,498 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:11,499 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:42:11,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:11,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:11,823 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:11,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:11,985 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:12,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:12,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-12 20:42:12,016 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:12,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-12 20:42:12,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-12 20:42:12,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-11-12 20:42:12,017 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-11-12 20:42:12,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:12,165 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-11-12 20:42:12,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-12 20:42:12,166 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-11-12 20:42:12,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:12,166 INFO L225 Difference]: With dead ends: 30 [2018-11-12 20:42:12,167 INFO L226 Difference]: Without dead ends: 25 [2018-11-12 20:42:12,167 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-11-12 20:42:12,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-12 20:42:12,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-11-12 20:42:12,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-11-12 20:42:12,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-11-12 20:42:12,173 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 15 [2018-11-12 20:42:12,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:12,174 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-11-12 20:42:12,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-12 20:42:12,174 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-11-12 20:42:12,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-12 20:42:12,175 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:12,175 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:12,175 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:12,176 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:12,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1437681655, now seen corresponding path program 2 times [2018-11-12 20:42:12,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:12,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:12,177 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:12,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:12,177 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:12,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:12,422 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:12,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:12,422 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:12,423 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:12,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:12,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:12,423 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:42:12,439 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:42:12,440 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:42:12,463 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-12 20:42:12,463 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:42:12,465 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:12,611 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:12,611 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:12,993 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:13,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:13,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-12 20:42:13,027 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:13,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-12 20:42:13,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-12 20:42:13,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-11-12 20:42:13,028 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-11-12 20:42:13,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:13,493 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-11-12 20:42:13,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-12 20:42:13,495 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-11-12 20:42:13,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:13,496 INFO L225 Difference]: With dead ends: 39 [2018-11-12 20:42:13,496 INFO L226 Difference]: Without dead ends: 34 [2018-11-12 20:42:13,496 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2018-11-12 20:42:13,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-12 20:42:13,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-11-12 20:42:13,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-12 20:42:13,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-11-12 20:42:13,503 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 24 [2018-11-12 20:42:13,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:13,504 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-11-12 20:42:13,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-12 20:42:13,504 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-11-12 20:42:13,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-12 20:42:13,505 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:13,505 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:13,506 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:13,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:13,506 INFO L82 PathProgramCache]: Analyzing trace with hash -656200317, now seen corresponding path program 3 times [2018-11-12 20:42:13,506 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:13,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:13,507 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:42:13,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:13,508 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:13,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:13,702 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:13,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:13,702 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:13,703 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:13,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:13,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:13,703 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-12 20:42:13,716 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:42:13,716 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:42:13,731 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:42:13,731 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:42:13,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:13,823 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:13,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:14,154 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:14,174 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:14,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-12 20:42:14,174 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:14,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-12 20:42:14,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-12 20:42:14,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-11-12 20:42:14,176 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 13 states. [2018-11-12 20:42:14,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:14,533 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2018-11-12 20:42:14,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-12 20:42:14,541 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-11-12 20:42:14,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:14,542 INFO L225 Difference]: With dead ends: 48 [2018-11-12 20:42:14,543 INFO L226 Difference]: Without dead ends: 43 [2018-11-12 20:42:14,544 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=277, Invalid=535, Unknown=0, NotChecked=0, Total=812 [2018-11-12 20:42:14,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-11-12 20:42:14,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-11-12 20:42:14,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-12 20:42:14,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-11-12 20:42:14,556 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 33 [2018-11-12 20:42:14,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:14,557 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-11-12 20:42:14,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-12 20:42:14,557 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-11-12 20:42:14,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-11-12 20:42:14,567 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:14,567 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:14,567 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:14,568 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:14,568 INFO L82 PathProgramCache]: Analyzing trace with hash -1490238089, now seen corresponding path program 4 times [2018-11-12 20:42:14,568 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:14,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:14,569 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:42:14,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:14,569 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:14,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:14,859 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:14,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:14,860 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:14,860 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:14,860 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:14,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:14,861 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:42:14,874 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:14,874 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:42:14,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:14,895 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:15,003 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:15,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:15,531 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:15,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:15,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-12 20:42:15,551 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:15,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-12 20:42:15,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-12 20:42:15,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=441, Unknown=0, NotChecked=0, Total=650 [2018-11-12 20:42:15,553 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 16 states. [2018-11-12 20:42:16,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:16,229 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-11-12 20:42:16,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-12 20:42:16,236 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-11-12 20:42:16,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:16,237 INFO L225 Difference]: With dead ends: 57 [2018-11-12 20:42:16,237 INFO L226 Difference]: Without dead ends: 52 [2018-11-12 20:42:16,238 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-11-12 20:42:16,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-12 20:42:16,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-11-12 20:42:16,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-11-12 20:42:16,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-11-12 20:42:16,247 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 42 [2018-11-12 20:42:16,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:16,248 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-11-12 20:42:16,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-12 20:42:16,248 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-11-12 20:42:16,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-11-12 20:42:16,249 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:16,250 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:16,250 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:16,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:16,250 INFO L82 PathProgramCache]: Analyzing trace with hash 45932547, now seen corresponding path program 5 times [2018-11-12 20:42:16,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:16,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:16,252 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:16,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:16,252 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:16,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:17,167 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:17,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:17,168 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:17,168 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:17,168 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:17,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:17,169 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-12 20:42:17,178 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:42:17,179 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:42:17,207 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-11-12 20:42:17,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:42:17,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:17,311 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:17,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:18,109 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:18,129 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:18,129 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-12 20:42:18,129 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:18,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-12 20:42:18,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-12 20:42:18,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=666, Unknown=0, NotChecked=0, Total=992 [2018-11-12 20:42:18,133 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 19 states. [2018-11-12 20:42:18,966 WARN L179 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 11 [2018-11-12 20:42:19,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:19,338 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2018-11-12 20:42:19,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-12 20:42:19,341 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2018-11-12 20:42:19,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:19,342 INFO L225 Difference]: With dead ends: 66 [2018-11-12 20:42:19,342 INFO L226 Difference]: Without dead ends: 61 [2018-11-12 20:42:19,344 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=766, Invalid=1396, Unknown=0, NotChecked=0, Total=2162 [2018-11-12 20:42:19,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-12 20:42:19,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-11-12 20:42:19,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-11-12 20:42:19,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-11-12 20:42:19,353 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 51 [2018-11-12 20:42:19,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:19,353 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-11-12 20:42:19,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-12 20:42:19,354 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-11-12 20:42:19,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-11-12 20:42:19,355 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:19,356 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:19,356 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:19,356 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:19,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1227627785, now seen corresponding path program 6 times [2018-11-12 20:42:19,357 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:19,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:19,358 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:42:19,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:19,358 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:19,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:20,093 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:20,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:20,093 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:20,094 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:20,094 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:20,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:20,094 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:42:20,111 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:42:20,112 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:42:20,133 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:42:20,133 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:42:20,138 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:20,224 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:20,225 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:20,951 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:20,972 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:20,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-12 20:42:20,972 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:20,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-12 20:42:20,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-12 20:42:20,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=936, Unknown=0, NotChecked=0, Total=1406 [2018-11-12 20:42:20,974 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 22 states. [2018-11-12 20:42:21,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:21,808 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2018-11-12 20:42:21,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-12 20:42:21,810 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 60 [2018-11-12 20:42:21,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:21,812 INFO L225 Difference]: With dead ends: 75 [2018-11-12 20:42:21,812 INFO L226 Difference]: Without dead ends: 70 [2018-11-12 20:42:21,814 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1105, Invalid=1975, Unknown=0, NotChecked=0, Total=3080 [2018-11-12 20:42:21,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-11-12 20:42:21,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-11-12 20:42:21,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-11-12 20:42:21,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-11-12 20:42:21,823 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 60 [2018-11-12 20:42:21,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:21,823 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-11-12 20:42:21,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-12 20:42:21,823 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-11-12 20:42:21,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-12 20:42:21,825 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:21,825 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:21,825 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:21,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:21,825 INFO L82 PathProgramCache]: Analyzing trace with hash 360641155, now seen corresponding path program 7 times [2018-11-12 20:42:21,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:21,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:21,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:42:21,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:21,827 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:21,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:22,509 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:22,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:22,509 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:22,509 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:22,510 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:22,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:22,510 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-12 20:42:22,518 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:22,518 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:42:22,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:22,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:22,655 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:22,655 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:23,974 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:23,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:23,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-11-12 20:42:23,995 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:23,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-12 20:42:23,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-12 20:42:23,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1251, Unknown=0, NotChecked=0, Total=1892 [2018-11-12 20:42:23,996 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 25 states. [2018-11-12 20:42:25,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:25,083 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2018-11-12 20:42:25,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-12 20:42:25,086 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-11-12 20:42:25,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:25,087 INFO L225 Difference]: With dead ends: 84 [2018-11-12 20:42:25,087 INFO L226 Difference]: Without dead ends: 79 [2018-11-12 20:42:25,089 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1507, Invalid=2653, Unknown=0, NotChecked=0, Total=4160 [2018-11-12 20:42:25,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-12 20:42:25,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-11-12 20:42:25,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-12 20:42:25,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-11-12 20:42:25,098 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 69 [2018-11-12 20:42:25,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:25,099 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-11-12 20:42:25,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-12 20:42:25,099 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-11-12 20:42:25,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-11-12 20:42:25,101 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:25,101 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:25,101 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:25,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:25,101 INFO L82 PathProgramCache]: Analyzing trace with hash -318857097, now seen corresponding path program 8 times [2018-11-12 20:42:25,102 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:25,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:25,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:25,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:25,103 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:25,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:25,670 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:25,670 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:25,671 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:25,671 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:25,671 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:25,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:25,671 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:42:25,687 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:42:25,687 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:42:25,735 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-11-12 20:42:25,735 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:42:25,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:25,830 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:25,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:26,714 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:26,734 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:26,734 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-11-12 20:42:26,734 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:26,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-12 20:42:26,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-12 20:42:26,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=1611, Unknown=0, NotChecked=0, Total=2450 [2018-11-12 20:42:26,736 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 28 states. [2018-11-12 20:42:27,688 WARN L179 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 11 [2018-11-12 20:42:28,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:28,677 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-11-12 20:42:28,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-12 20:42:28,685 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 78 [2018-11-12 20:42:28,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:28,686 INFO L225 Difference]: With dead ends: 93 [2018-11-12 20:42:28,686 INFO L226 Difference]: Without dead ends: 88 [2018-11-12 20:42:28,688 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1972, Invalid=3430, Unknown=0, NotChecked=0, Total=5402 [2018-11-12 20:42:28,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-11-12 20:42:28,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-11-12 20:42:28,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-11-12 20:42:28,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-11-12 20:42:28,700 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 78 [2018-11-12 20:42:28,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:28,701 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-11-12 20:42:28,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-12 20:42:28,701 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-11-12 20:42:28,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-12 20:42:28,703 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:28,703 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:28,703 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:28,704 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:28,704 INFO L82 PathProgramCache]: Analyzing trace with hash -1949211389, now seen corresponding path program 9 times [2018-11-12 20:42:28,704 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:28,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:28,705 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:42:28,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:28,705 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:28,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:29,871 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:29,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:29,872 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:29,872 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:29,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:29,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:29,872 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-12 20:42:29,882 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:42:29,882 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:42:29,907 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:42:29,907 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:42:29,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:30,043 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:30,043 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:31,103 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:31,123 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:31,123 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-11-12 20:42:31,123 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:31,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-12 20:42:31,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-12 20:42:31,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=2016, Unknown=0, NotChecked=0, Total=3080 [2018-11-12 20:42:31,125 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 31 states. [2018-11-12 20:42:32,021 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 11 [2018-11-12 20:42:33,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:33,309 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-11-12 20:42:33,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-12 20:42:33,314 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2018-11-12 20:42:33,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:33,315 INFO L225 Difference]: With dead ends: 102 [2018-11-12 20:42:33,315 INFO L226 Difference]: Without dead ends: 97 [2018-11-12 20:42:33,320 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2500, Invalid=4306, Unknown=0, NotChecked=0, Total=6806 [2018-11-12 20:42:33,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-12 20:42:33,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-11-12 20:42:33,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-11-12 20:42:33,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-11-12 20:42:33,333 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 87 [2018-11-12 20:42:33,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:33,333 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-11-12 20:42:33,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-12 20:42:33,334 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-11-12 20:42:33,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-11-12 20:42:33,335 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:33,335 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:33,335 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:33,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:33,336 INFO L82 PathProgramCache]: Analyzing trace with hash 1275395575, now seen corresponding path program 10 times [2018-11-12 20:42:33,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:33,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:33,337 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:42:33,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:33,337 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:33,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:33,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:33,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:33,922 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:33,923 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:33,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:33,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:33,923 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:42:33,931 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:33,931 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:42:33,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:33,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:34,122 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:34,122 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:35,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:35,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:35,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-11-12 20:42:35,444 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:35,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-12 20:42:35,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-12 20:42:35,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1316, Invalid=2466, Unknown=0, NotChecked=0, Total=3782 [2018-11-12 20:42:35,446 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 34 states. [2018-11-12 20:42:37,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:37,556 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2018-11-12 20:42:37,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-12 20:42:37,557 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2018-11-12 20:42:37,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:37,558 INFO L225 Difference]: With dead ends: 111 [2018-11-12 20:42:37,558 INFO L226 Difference]: Without dead ends: 106 [2018-11-12 20:42:37,562 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3091, Invalid=5281, Unknown=0, NotChecked=0, Total=8372 [2018-11-12 20:42:37,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-11-12 20:42:37,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-11-12 20:42:37,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-11-12 20:42:37,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-11-12 20:42:37,570 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 96 [2018-11-12 20:42:37,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:37,570 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-11-12 20:42:37,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-12 20:42:37,571 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-11-12 20:42:37,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-11-12 20:42:37,572 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:37,572 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:37,573 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:37,573 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:37,573 INFO L82 PathProgramCache]: Analyzing trace with hash -2040776829, now seen corresponding path program 11 times [2018-11-12 20:42:37,573 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:37,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:37,574 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:37,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:37,574 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:37,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:38,779 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:38,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:38,779 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:38,779 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:38,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:38,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:38,780 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-12 20:42:38,801 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:42:38,801 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:42:38,856 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-11-12 20:42:38,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:42:38,860 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:38,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:38,977 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:40,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:40,473 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:40,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-11-12 20:42:40,474 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:40,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-12 20:42:40,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-12 20:42:40,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2018-11-12 20:42:40,476 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 37 states. [2018-11-12 20:42:40,703 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 8 [2018-11-12 20:42:42,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:42,952 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2018-11-12 20:42:42,952 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-12 20:42:42,953 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2018-11-12 20:42:42,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:42,954 INFO L225 Difference]: With dead ends: 120 [2018-11-12 20:42:42,954 INFO L226 Difference]: Without dead ends: 115 [2018-11-12 20:42:42,957 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3745, Invalid=6355, Unknown=0, NotChecked=0, Total=10100 [2018-11-12 20:42:42,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-11-12 20:42:42,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-11-12 20:42:42,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-12 20:42:42,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-11-12 20:42:42,963 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 105 [2018-11-12 20:42:42,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:42,964 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-11-12 20:42:42,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-12 20:42:42,964 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-11-12 20:42:42,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-11-12 20:42:42,966 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:42,966 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:42,966 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:42,966 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:42,966 INFO L82 PathProgramCache]: Analyzing trace with hash -264307849, now seen corresponding path program 12 times [2018-11-12 20:42:42,966 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:42,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:42,967 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:42:42,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:42,968 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:43,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:44,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:44,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:44,078 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:44,078 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:44,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:44,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:44,079 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:42:44,087 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:42:44,087 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:42:44,140 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:42:44,140 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:42:44,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:44,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:44,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:46,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:46,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:46,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-11-12 20:42:46,500 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:46,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-12 20:42:46,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-12 20:42:46,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=3501, Unknown=0, NotChecked=0, Total=5402 [2018-11-12 20:42:46,505 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 40 states. [2018-11-12 20:42:49,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:49,444 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2018-11-12 20:42:49,445 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-12 20:42:49,445 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 114 [2018-11-12 20:42:49,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:49,447 INFO L225 Difference]: With dead ends: 129 [2018-11-12 20:42:49,447 INFO L226 Difference]: Without dead ends: 124 [2018-11-12 20:42:49,449 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=4462, Invalid=7528, Unknown=0, NotChecked=0, Total=11990 [2018-11-12 20:42:49,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-11-12 20:42:49,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-11-12 20:42:49,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-11-12 20:42:49,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-11-12 20:42:49,456 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 114 [2018-11-12 20:42:49,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:49,456 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-11-12 20:42:49,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-12 20:42:49,457 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-11-12 20:42:49,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-11-12 20:42:49,460 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:49,461 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:49,461 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:49,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:49,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1271360003, now seen corresponding path program 13 times [2018-11-12 20:42:49,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:49,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:49,462 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:42:49,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:49,462 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:49,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:50,387 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:50,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:50,387 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:50,388 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:50,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:50,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:50,388 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-12 20:42:50,400 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:50,400 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:42:50,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:50,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:50,631 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:50,632 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:42:52,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:52,961 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:42:52,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-11-12 20:42:52,962 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:42:52,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-12 20:42:52,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-12 20:42:52,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2234, Invalid=4086, Unknown=0, NotChecked=0, Total=6320 [2018-11-12 20:42:52,964 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 43 states. [2018-11-12 20:42:56,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:42:56,589 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2018-11-12 20:42:56,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-12 20:42:56,589 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 123 [2018-11-12 20:42:56,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:42:56,591 INFO L225 Difference]: With dead ends: 138 [2018-11-12 20:42:56,591 INFO L226 Difference]: Without dead ends: 133 [2018-11-12 20:42:56,593 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 206 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5242, Invalid=8800, Unknown=0, NotChecked=0, Total=14042 [2018-11-12 20:42:56,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-11-12 20:42:56,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-11-12 20:42:56,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-11-12 20:42:56,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2018-11-12 20:42:56,599 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 123 [2018-11-12 20:42:56,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:42:56,600 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2018-11-12 20:42:56,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-12 20:42:56,600 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2018-11-12 20:42:56,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-11-12 20:42:56,601 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:42:56,601 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:42:56,602 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:42:56,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:42:56,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1878746889, now seen corresponding path program 14 times [2018-11-12 20:42:56,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:42:56,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:56,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:42:56,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:42:56,603 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:42:56,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:42:57,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:57,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:57,653 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:42:57,653 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:42:57,654 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:42:57,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:42:57,654 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:42:57,669 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:42:57,669 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:42:57,709 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-11-12 20:42:57,710 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:42:57,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:42:57,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:42:57,859 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:43:00,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:00,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:43:00,652 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-11-12 20:43:00,652 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:43:00,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-12 20:43:00,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-12 20:43:00,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2594, Invalid=4716, Unknown=0, NotChecked=0, Total=7310 [2018-11-12 20:43:00,653 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 46 states. [2018-11-12 20:43:04,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:43:04,854 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-11-12 20:43:04,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-12 20:43:04,855 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 132 [2018-11-12 20:43:04,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:43:04,856 INFO L225 Difference]: With dead ends: 147 [2018-11-12 20:43:04,857 INFO L226 Difference]: Without dead ends: 142 [2018-11-12 20:43:04,859 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=6085, Invalid=10171, Unknown=0, NotChecked=0, Total=16256 [2018-11-12 20:43:04,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-11-12 20:43:04,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-11-12 20:43:04,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-11-12 20:43:04,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-11-12 20:43:04,866 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 132 [2018-11-12 20:43:04,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:43:04,866 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-11-12 20:43:04,866 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-12 20:43:04,867 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-11-12 20:43:04,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-11-12 20:43:04,868 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:43:04,868 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:43:04,868 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:43:04,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:43:04,869 INFO L82 PathProgramCache]: Analyzing trace with hash -927269757, now seen corresponding path program 15 times [2018-11-12 20:43:04,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:43:04,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:04,870 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:43:04,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:04,870 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:43:04,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:43:06,078 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:06,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:06,079 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:43:06,079 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:43:06,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:43:06,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:06,079 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-12 20:43:06,088 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:43:06,088 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:43:06,126 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:43:06,126 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:43:06,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:43:06,284 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:06,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:43:09,370 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:09,390 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:43:09,390 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-11-12 20:43:09,390 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:43:09,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-12 20:43:09,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-12 20:43:09,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2981, Invalid=5391, Unknown=0, NotChecked=0, Total=8372 [2018-11-12 20:43:09,392 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 49 states. [2018-11-12 20:43:14,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:43:14,199 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2018-11-12 20:43:14,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-12 20:43:14,199 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 141 [2018-11-12 20:43:14,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:43:14,200 INFO L225 Difference]: With dead ends: 156 [2018-11-12 20:43:14,200 INFO L226 Difference]: Without dead ends: 151 [2018-11-12 20:43:14,201 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1296 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=6991, Invalid=11641, Unknown=0, NotChecked=0, Total=18632 [2018-11-12 20:43:14,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-11-12 20:43:14,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-11-12 20:43:14,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-11-12 20:43:14,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-11-12 20:43:14,208 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 141 [2018-11-12 20:43:14,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:43:14,208 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-11-12 20:43:14,208 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-12 20:43:14,208 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-11-12 20:43:14,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-11-12 20:43:14,209 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:43:14,209 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:43:14,209 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:43:14,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:43:14,210 INFO L82 PathProgramCache]: Analyzing trace with hash -72493449, now seen corresponding path program 16 times [2018-11-12 20:43:14,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:43:14,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:14,211 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:43:14,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:14,211 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:43:14,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:43:15,531 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:15,531 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:15,531 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:43:15,532 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:43:15,532 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:43:15,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:15,532 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:43:15,549 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:43:15,549 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:43:15,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:43:15,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:43:16,066 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:16,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:43:19,324 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:19,346 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:43:19,346 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-11-12 20:43:19,346 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:43:19,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-12 20:43:19,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-12 20:43:19,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3395, Invalid=6111, Unknown=0, NotChecked=0, Total=9506 [2018-11-12 20:43:19,347 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 52 states. [2018-11-12 20:43:25,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:43:25,016 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2018-11-12 20:43:25,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-12 20:43:25,017 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 150 [2018-11-12 20:43:25,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:43:25,019 INFO L225 Difference]: With dead ends: 165 [2018-11-12 20:43:25,019 INFO L226 Difference]: Without dead ends: 160 [2018-11-12 20:43:25,021 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=7960, Invalid=13210, Unknown=0, NotChecked=0, Total=21170 [2018-11-12 20:43:25,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-11-12 20:43:25,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-11-12 20:43:25,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-11-12 20:43:25,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-11-12 20:43:25,028 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 150 [2018-11-12 20:43:25,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:43:25,028 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-11-12 20:43:25,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-12 20:43:25,028 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-11-12 20:43:25,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-11-12 20:43:25,029 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:43:25,029 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:43:25,029 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:43:25,029 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:43:25,029 INFO L82 PathProgramCache]: Analyzing trace with hash 266268419, now seen corresponding path program 17 times [2018-11-12 20:43:25,029 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:43:25,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:25,030 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:43:25,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:25,031 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:43:25,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:43:26,778 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:26,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:26,779 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:43:26,779 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:43:26,779 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:43:26,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:26,780 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-12 20:43:26,788 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:43:26,789 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:43:26,841 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-11-12 20:43:26,841 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:43:26,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:43:27,008 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:27,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:43:30,849 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:30,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:43:30,869 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-11-12 20:43:30,869 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:43:30,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-11-12 20:43:30,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-11-12 20:43:30,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=6876, Unknown=0, NotChecked=0, Total=10712 [2018-11-12 20:43:30,871 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 55 states. [2018-11-12 20:43:31,264 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 9 [2018-11-12 20:43:31,391 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-12 20:43:31,524 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-12 20:43:31,789 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-12 20:43:36,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:43:36,964 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2018-11-12 20:43:36,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-12 20:43:36,966 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 159 [2018-11-12 20:43:36,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:43:36,967 INFO L225 Difference]: With dead ends: 174 [2018-11-12 20:43:36,967 INFO L226 Difference]: Without dead ends: 169 [2018-11-12 20:43:36,969 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=8992, Invalid=14878, Unknown=0, NotChecked=0, Total=23870 [2018-11-12 20:43:36,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-12 20:43:36,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-11-12 20:43:36,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-11-12 20:43:36,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2018-11-12 20:43:36,976 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 159 [2018-11-12 20:43:36,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:43:36,977 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2018-11-12 20:43:36,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-11-12 20:43:36,977 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2018-11-12 20:43:36,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-11-12 20:43:36,978 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:43:36,978 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:43:36,978 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:43:36,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:43:36,978 INFO L82 PathProgramCache]: Analyzing trace with hash -1651330057, now seen corresponding path program 18 times [2018-11-12 20:43:36,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:43:36,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:36,979 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:43:36,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:36,980 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:43:37,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:43:38,670 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:38,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:38,671 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:43:38,671 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:43:38,671 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:43:38,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:38,671 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:43:38,682 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:43:38,682 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:43:38,775 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:43:38,775 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:43:38,804 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:43:38,999 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:38,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:43:43,171 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:43,191 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:43:43,192 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-11-12 20:43:43,192 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:43:43,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-11-12 20:43:43,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-11-12 20:43:43,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4304, Invalid=7686, Unknown=0, NotChecked=0, Total=11990 [2018-11-12 20:43:43,193 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 58 states. [2018-11-12 20:43:43,361 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2018-11-12 20:43:43,482 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-11-12 20:43:43,617 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-11-12 20:43:43,759 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-12 20:43:43,899 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-12 20:43:44,040 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-12 20:43:44,185 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-12 20:43:44,331 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-12 20:43:44,474 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-12 20:43:44,625 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-12 20:43:44,959 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-11-12 20:43:50,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:43:50,358 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2018-11-12 20:43:50,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-11-12 20:43:50,358 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 168 [2018-11-12 20:43:50,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:43:50,359 INFO L225 Difference]: With dead ends: 183 [2018-11-12 20:43:50,360 INFO L226 Difference]: Without dead ends: 178 [2018-11-12 20:43:50,361 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1800 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=10087, Invalid=16645, Unknown=0, NotChecked=0, Total=26732 [2018-11-12 20:43:50,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-11-12 20:43:50,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-11-12 20:43:50,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-11-12 20:43:50,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-11-12 20:43:50,369 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 168 [2018-11-12 20:43:50,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:43:50,369 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-11-12 20:43:50,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-11-12 20:43:50,369 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-11-12 20:43:50,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-11-12 20:43:50,370 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:43:50,371 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:43:50,371 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:43:50,371 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:43:50,371 INFO L82 PathProgramCache]: Analyzing trace with hash -639942269, now seen corresponding path program 19 times [2018-11-12 20:43:50,371 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:43:50,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:50,372 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:43:50,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:43:50,372 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:43:50,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:43:52,322 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:52,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:52,323 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:43:52,323 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:43:52,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:43:52,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:43:52,323 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:43:52,332 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:43:52,333 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:43:52,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:43:52,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:43:52,919 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:52,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:43:57,545 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:43:57,565 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:43:57,565 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-11-12 20:43:57,565 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:43:57,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-11-12 20:43:57,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-11-12 20:43:57,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4799, Invalid=8541, Unknown=0, NotChecked=0, Total=13340 [2018-11-12 20:43:57,567 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 61 states. [2018-11-12 20:43:57,768 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-11-12 20:43:57,896 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2018-11-12 20:43:58,039 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2018-11-12 20:43:58,189 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-12 20:43:58,342 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-12 20:43:58,501 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-12 20:43:58,654 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-12 20:43:58,815 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-12 20:43:58,980 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-12 20:43:59,138 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-12 20:43:59,294 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-12 20:43:59,455 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-12 20:44:00,120 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-11-12 20:44:00,309 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-11-12 20:44:05,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:44:05,734 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-11-12 20:44:05,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-11-12 20:44:05,735 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 177 [2018-11-12 20:44:05,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:44:05,737 INFO L225 Difference]: With dead ends: 192 [2018-11-12 20:44:05,737 INFO L226 Difference]: Without dead ends: 187 [2018-11-12 20:44:05,739 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 296 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=11245, Invalid=18511, Unknown=0, NotChecked=0, Total=29756 [2018-11-12 20:44:05,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-11-12 20:44:05,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-11-12 20:44:05,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-11-12 20:44:05,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-11-12 20:44:05,747 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 177 [2018-11-12 20:44:05,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:44:05,748 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-11-12 20:44:05,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-11-12 20:44:05,748 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-11-12 20:44:05,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-11-12 20:44:05,749 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:44:05,749 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:44:05,749 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:44:05,750 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:44:05,750 INFO L82 PathProgramCache]: Analyzing trace with hash -99929737, now seen corresponding path program 20 times [2018-11-12 20:44:05,750 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:44:05,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:44:05,751 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:44:05,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:44:05,751 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:44:05,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:44:07,758 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:44:07,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:44:07,758 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:44:07,758 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:44:07,758 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:44:07,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:44:07,759 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:44:07,777 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:44:07,777 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:44:07,920 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-11-12 20:44:07,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:44:07,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:44:08,112 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:44:08,112 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:44:13,096 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:44:13,127 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:44:13,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-11-12 20:44:13,127 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:44:13,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-11-12 20:44:13,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-11-12 20:44:13,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5321, Invalid=9441, Unknown=0, NotChecked=0, Total=14762 [2018-11-12 20:44:13,130 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 64 states. [2018-11-12 20:44:13,402 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 8 [2018-11-12 20:44:13,548 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-11-12 20:44:13,712 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-11-12 20:44:13,876 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-12 20:44:14,045 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-12 20:44:14,218 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-12 20:44:14,385 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-12 20:44:14,565 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-12 20:44:14,753 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-12 20:44:14,929 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-12 20:44:15,105 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-12 20:44:15,280 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-12 20:44:15,473 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-12 20:44:15,673 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-12 20:44:15,855 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-12 20:44:16,049 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-12 20:44:16,233 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-12 20:44:22,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:44:22,708 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2018-11-12 20:44:22,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-11-12 20:44:22,711 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 186 [2018-11-12 20:44:22,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:44:22,713 INFO L225 Difference]: With dead ends: 201 [2018-11-12 20:44:22,713 INFO L226 Difference]: Without dead ends: 196 [2018-11-12 20:44:22,714 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 311 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2181 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=12466, Invalid=20476, Unknown=0, NotChecked=0, Total=32942 [2018-11-12 20:44:22,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-11-12 20:44:22,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-11-12 20:44:22,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-11-12 20:44:22,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-11-12 20:44:22,722 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 186 [2018-11-12 20:44:22,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:44:22,723 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-11-12 20:44:22,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-11-12 20:44:22,723 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-11-12 20:44:22,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-11-12 20:44:22,724 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:44:22,724 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:44:22,724 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:44:22,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:44:22,725 INFO L82 PathProgramCache]: Analyzing trace with hash 89650179, now seen corresponding path program 21 times [2018-11-12 20:44:22,725 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:44:22,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:44:22,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:44:22,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:44:22,726 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:44:22,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:44:25,122 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:44:25,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:44:25,123 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:44:25,123 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:44:25,123 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:44:25,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:44:25,123 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:44:25,132 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:44:25,132 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:44:25,296 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:44:25,296 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:44:25,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:44:25,730 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:44:25,731 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:44:31,432 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:44:31,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:44:31,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-11-12 20:44:31,453 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:44:31,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-11-12 20:44:31,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-11-12 20:44:31,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5870, Invalid=10386, Unknown=0, NotChecked=0, Total=16256 [2018-11-12 20:44:31,455 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 67 states. [2018-11-12 20:44:31,686 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-11-12 20:44:31,838 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2018-11-12 20:44:32,015 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 9 [2018-11-12 20:44:32,190 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-12 20:44:32,376 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-12 20:44:32,561 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-12 20:44:32,744 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-12 20:44:32,932 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-12 20:44:33,125 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-12 20:44:33,316 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-12 20:44:33,501 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-12 20:44:33,691 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-12 20:44:33,885 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-12 20:44:34,079 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-12 20:44:34,269 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-12 20:44:34,453 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-12 20:44:34,921 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-12 20:44:35,111 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-12 20:44:35,306 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-12 20:44:35,918 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-11-12 20:44:42,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:44:42,009 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2018-11-12 20:44:42,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-11-12 20:44:42,010 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 195 [2018-11-12 20:44:42,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:44:42,012 INFO L225 Difference]: With dead ends: 210 [2018-11-12 20:44:42,012 INFO L226 Difference]: Without dead ends: 205 [2018-11-12 20:44:42,014 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 326 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2385 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=13750, Invalid=22540, Unknown=0, NotChecked=0, Total=36290 [2018-11-12 20:44:42,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-11-12 20:44:42,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-11-12 20:44:42,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-11-12 20:44:42,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2018-11-12 20:44:42,022 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 195 [2018-11-12 20:44:42,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:44:42,022 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2018-11-12 20:44:42,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-11-12 20:44:42,023 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2018-11-12 20:44:42,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-11-12 20:44:42,024 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:44:42,024 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:44:42,024 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:44:42,024 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:44:42,024 INFO L82 PathProgramCache]: Analyzing trace with hash 795823863, now seen corresponding path program 22 times [2018-11-12 20:44:42,024 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:44:42,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:44:42,025 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:44:42,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:44:42,026 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:44:42,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:44:44,568 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:44:44,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:44:44,568 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:44:44,569 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:44:44,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:44:44,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:44:44,569 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:44:44,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:44:44,577 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:44:44,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:44:44,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:44:45,219 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:44:45,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:44:51,240 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:44:51,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:44:51,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-11-12 20:44:51,262 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:44:51,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-11-12 20:44:51,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-11-12 20:44:51,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6446, Invalid=11376, Unknown=0, NotChecked=0, Total=17822 [2018-11-12 20:44:51,264 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 70 states. [2018-11-12 20:44:51,590 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2018-11-12 20:44:51,757 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-11-12 20:44:51,942 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-11-12 20:44:52,126 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-12 20:44:52,309 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-12 20:44:52,499 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-12 20:44:52,699 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-12 20:44:52,887 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-12 20:44:53,086 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-12 20:44:53,287 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-12 20:44:53,490 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-12 20:44:53,692 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-12 20:44:53,903 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-12 20:44:54,099 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-12 20:44:54,300 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-12 20:44:54,493 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-12 20:44:54,693 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-12 20:44:54,895 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-12 20:44:55,096 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-12 20:44:55,294 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-12 20:44:55,493 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-12 20:44:58,539 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 11 [2018-11-12 20:45:02,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:45:02,953 INFO L93 Difference]: Finished difference Result 219 states and 221 transitions. [2018-11-12 20:45:02,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-11-12 20:45:02,953 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 204 [2018-11-12 20:45:02,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:45:02,954 INFO L225 Difference]: With dead ends: 219 [2018-11-12 20:45:02,955 INFO L226 Difference]: Without dead ends: 214 [2018-11-12 20:45:02,957 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 341 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2598 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=15097, Invalid=24703, Unknown=0, NotChecked=0, Total=39800 [2018-11-12 20:45:02,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-11-12 20:45:02,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2018-11-12 20:45:02,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-11-12 20:45:02,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2018-11-12 20:45:02,965 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 204 [2018-11-12 20:45:02,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:45:02,965 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2018-11-12 20:45:02,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-11-12 20:45:02,966 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2018-11-12 20:45:02,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-11-12 20:45:02,967 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:45:02,967 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:45:02,967 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:45:02,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:45:02,967 INFO L82 PathProgramCache]: Analyzing trace with hash 385681027, now seen corresponding path program 23 times [2018-11-12 20:45:02,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:45:02,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:45:02,968 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:45:02,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:45:02,968 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:45:03,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:45:05,665 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:45:05,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:45:05,665 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:45:05,665 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:45:05,666 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:45:05,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:45:05,666 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:45:05,674 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:45:05,674 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:45:05,782 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2018-11-12 20:45:05,782 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:45:05,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:45:06,045 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:45:06,046 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:45:12,681 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:45:12,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:45:12,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-11-12 20:45:12,702 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:45:12,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-11-12 20:45:12,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-11-12 20:45:12,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7049, Invalid=12411, Unknown=0, NotChecked=0, Total=19460 [2018-11-12 20:45:12,704 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 73 states. [2018-11-12 20:45:13,497 WARN L179 SmtUtils]: Spent 348.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-11-12 20:45:13,672 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2018-11-12 20:45:13,870 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2018-11-12 20:45:14,073 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-12 20:45:14,275 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-12 20:45:14,480 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-12 20:45:14,693 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-12 20:45:14,909 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-12 20:45:15,119 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-12 20:45:15,339 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-12 20:45:15,556 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-12 20:45:15,770 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-12 20:45:15,988 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-12 20:45:16,199 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-12 20:45:16,415 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-12 20:45:16,644 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-12 20:45:16,966 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-12 20:45:18,095 WARN L179 SmtUtils]: Spent 636.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-12 20:45:18,304 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-12 20:45:18,527 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-12 20:45:18,747 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-12 20:45:18,958 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-12 20:45:19,174 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-12 20:45:19,384 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-12 20:45:27,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:45:27,420 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2018-11-12 20:45:27,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-11-12 20:45:27,422 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 213 [2018-11-12 20:45:27,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:45:27,424 INFO L225 Difference]: With dead ends: 228 [2018-11-12 20:45:27,424 INFO L226 Difference]: Without dead ends: 223 [2018-11-12 20:45:27,425 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 356 SyntacticMatches, 2 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2820 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=16507, Invalid=26965, Unknown=0, NotChecked=0, Total=43472 [2018-11-12 20:45:27,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-11-12 20:45:27,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2018-11-12 20:45:27,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-11-12 20:45:27,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2018-11-12 20:45:27,434 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 213 [2018-11-12 20:45:27,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:45:27,434 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2018-11-12 20:45:27,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-11-12 20:45:27,434 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2018-11-12 20:45:27,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-11-12 20:45:27,436 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:45:27,436 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:45:27,436 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:45:27,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:45:27,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1981222007, now seen corresponding path program 24 times [2018-11-12 20:45:27,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:45:27,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:45:27,437 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:45:27,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:45:27,438 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:45:27,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:45:30,520 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:45:30,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:45:30,520 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:45:30,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:45:30,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:45:30,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:45:30,521 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:45:30,530 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:45:30,530 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:45:30,790 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:45:30,790 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:45:30,927 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:45:31,261 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:45:31,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:45:38,838 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:45:38,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:45:38,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-11-12 20:45:38,858 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:45:38,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-11-12 20:45:38,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-11-12 20:45:38,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7679, Invalid=13491, Unknown=0, NotChecked=0, Total=21170 [2018-11-12 20:45:38,860 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 76 states. [2018-11-12 20:45:39,178 WARN L179 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 8 [2018-11-12 20:45:39,362 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-11-12 20:45:39,568 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-11-12 20:45:39,773 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-11-12 20:45:39,990 WARN L179 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-11-12 20:45:40,207 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-11-12 20:45:40,429 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-12 20:45:40,654 WARN L179 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-12 20:45:40,882 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-12 20:45:41,108 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-12 20:45:41,338 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-12 20:45:41,564 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-12 20:45:41,814 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-12 20:45:42,046 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-12 20:45:42,273 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-12 20:45:42,526 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-12 20:45:42,802 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-12 20:45:43,033 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-12 20:45:43,259 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-12 20:45:43,495 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-12 20:45:43,717 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-12 20:45:43,946 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-12 20:45:44,170 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-12 20:45:44,399 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-12 20:45:44,621 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-12 20:45:44,853 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-12 20:45:45,096 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-12 20:45:53,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:45:53,236 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-11-12 20:45:53,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-11-12 20:45:53,236 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 222 [2018-11-12 20:45:53,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:45:53,238 INFO L225 Difference]: With dead ends: 237 [2018-11-12 20:45:53,238 INFO L226 Difference]: Without dead ends: 232 [2018-11-12 20:45:53,240 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 589 GetRequests, 371 SyntacticMatches, 2 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3051 ImplicationChecksByTransitivity, 24.2s TimeCoverageRelationStatistics Valid=17980, Invalid=29326, Unknown=0, NotChecked=0, Total=47306 [2018-11-12 20:45:53,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-11-12 20:45:53,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-11-12 20:45:53,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-11-12 20:45:53,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2018-11-12 20:45:53,249 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 222 [2018-11-12 20:45:53,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:45:53,249 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2018-11-12 20:45:53,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-11-12 20:45:53,250 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2018-11-12 20:45:53,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-11-12 20:45:53,251 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:45:53,251 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:45:53,251 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:45:53,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:45:53,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1183680253, now seen corresponding path program 25 times [2018-11-12 20:45:53,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:45:53,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:45:53,253 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:45:53,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:45:53,253 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:45:53,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:45:57,759 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:45:57,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:45:57,759 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:45:57,759 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:45:57,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:45:57,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:45:57,760 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-12 20:45:57,769 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:45:57,769 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:45:58,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:45:58,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:45:58,590 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:45:58,590 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:46:06,163 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:46:06,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:46:06,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 152 [2018-11-12 20:46:06,187 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:46:06,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-11-12 20:46:06,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-11-12 20:46:06,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8336, Invalid=14616, Unknown=0, NotChecked=0, Total=22952 [2018-11-12 20:46:06,189 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 79 states. [2018-11-12 20:46:06,465 WARN L179 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-11-12 20:46:06,659 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 222 DAG size of output: 8 [2018-11-12 20:46:06,882 WARN L179 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 9 [2018-11-12 20:46:07,108 WARN L179 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-11-12 20:46:07,351 WARN L179 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-11-12 20:46:07,577 WARN L179 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-11-12 20:46:07,800 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-11-12 20:46:08,042 WARN L179 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-11-12 20:46:08,305 WARN L179 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-11-12 20:46:08,555 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-12 20:46:08,803 WARN L179 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-12 20:46:09,063 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-12 20:46:09,314 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-12 20:46:09,636 WARN L179 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-12 20:46:09,889 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-12 20:46:10,136 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-12 20:46:10,381 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-12 20:46:10,629 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-12 20:46:10,880 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-12 20:46:11,133 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-12 20:46:11,380 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-12 20:46:11,625 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-12 20:46:11,880 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-12 20:46:12,121 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-12 20:46:12,363 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-12 20:46:12,622 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-12 20:46:12,867 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-12 20:46:13,109 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-12 20:46:13,374 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-12 20:46:13,615 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 Received shutdown request... [2018-11-12 20:46:17,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-11-12 20:46:17,478 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-12 20:46:17,483 WARN L205 ceAbstractionStarter]: Timeout [2018-11-12 20:46:17,483 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.11 08:46:17 BoogieIcfgContainer [2018-11-12 20:46:17,483 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-12 20:46:17,484 INFO L168 Benchmark]: Toolchain (without parser) took 248096.61 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 653.3 MB). Free memory was 1.4 GB in the beginning and 1.9 GB in the end (delta: -426.4 MB). Peak memory consumption was 226.9 MB. Max. memory is 7.1 GB. [2018-11-12 20:46:17,485 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-12 20:46:17,486 INFO L168 Benchmark]: CACSL2BoogieTranslator took 269.91 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-12 20:46:17,488 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.49 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-12 20:46:17,488 INFO L168 Benchmark]: Boogie Preprocessor took 22.44 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-12 20:46:17,488 INFO L168 Benchmark]: RCFGBuilder took 362.34 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 748.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -801.1 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. [2018-11-12 20:46:17,488 INFO L168 Benchmark]: TraceAbstraction took 247412.12 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -94.9 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 364.1 MB). Peak memory consumption was 269.2 MB. Max. memory is 7.1 GB. [2018-11-12 20:46:17,490 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 269.91 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.49 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 22.44 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 362.34 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 748.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -801.1 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 247412.12 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -94.9 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 364.1 MB). Peak memory consumption was 269.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (232states) and FLOYD_HOARE automaton (currently 48 states, 79 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 198 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 247.2s OverallTime, 27 OverallIterations, 74 TraceHistogramMax, 128.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 352 SDtfs, 3948 SDslu, 8692 SDs, 0 SdLazy, 4081 SolverSat, 2453 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8104 GetRequests, 5154 SyntacticMatches, 50 SemanticMatches, 2899 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29136 ImplicationChecksByTransitivity, 225.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=232occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 5.0s SatisfiabilityAnalysisTime, 111.1s InterpolantComputationTime, 6173 NumberOfCodeBlocks, 6173 NumberOfCodeBlocksAsserted, 344 NumberOfCheckSat, 9171 ConstructedInterpolants, 74 QuantifiedInterpolants, 8659439 SizeOfPredicates, 75 NumberOfNonLiveVariables, 4425 ConjunctsInSsa, 1000 ConjunctsInUnsatCore, 77 InterpolantComputations, 2 PerfectInterpolantSequences, 0/208050 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown