java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:07:14,563 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:07:14,566 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:07:14,581 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:07:14,581 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:07:14,582 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:07:14,583 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:07:14,585 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:07:14,587 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:07:14,588 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:07:14,589 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:07:14,589 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:07:14,590 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:07:14,591 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:07:14,592 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:07:14,593 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:07:14,594 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:07:14,596 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:07:14,598 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:07:14,600 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:07:14,601 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:07:14,603 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:07:14,605 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 09:07:14,606 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 09:07:14,606 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 09:07:14,607 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 09:07:14,608 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 09:07:14,609 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 09:07:14,610 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 09:07:14,611 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 09:07:14,611 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 09:07:14,612 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 09:07:14,614 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-27 09:07:14,641 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:07:14,642 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:07:14,643 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:07:14,643 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:07:14,643 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:07:14,643 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:07:14,643 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:07:14,644 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:07:14,644 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:07:14,644 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:07:14,644 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:07:14,644 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:07:14,644 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:07:14,645 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:07:14,645 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:07:14,646 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:07:14,646 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:07:14,646 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:07:14,646 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:07:14,646 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:07:14,647 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:07:14,647 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:07:14,647 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:07:14,647 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:07:14,647 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:07:14,648 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:07:14,648 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:07:14,648 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:07:14,648 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:07:14,649 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:07:14,649 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:07:14,649 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:07:14,649 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:07:14,649 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:07:14,650 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:07:14,650 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:07:14,710 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:07:14,729 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:07:14,734 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:07:14,736 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:07:14,736 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:07:14,737 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-27 09:07:14,807 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/de5794d87/1d7838b9b49d414aa17ddd2b63995f2c/FLAG794cb15cb [2018-10-27 09:07:15,289 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:07:15,290 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-27 09:07:15,296 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/de5794d87/1d7838b9b49d414aa17ddd2b63995f2c/FLAG794cb15cb [2018-10-27 09:07:15,312 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/de5794d87/1d7838b9b49d414aa17ddd2b63995f2c [2018-10-27 09:07:15,322 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:07:15,323 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:07:15,324 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:07:15,325 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:07:15,329 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:07:15,330 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,335 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@592be1bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15, skipping insertion in model container [2018-10-27 09:07:15,335 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,345 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:07:15,364 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:07:15,563 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:07:15,567 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:07:15,588 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:07:15,608 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:07:15,608 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15 WrapperNode [2018-10-27 09:07:15,609 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:07:15,610 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:07:15,610 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:07:15,610 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:07:15,621 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,627 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,633 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:07:15,634 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:07:15,634 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:07:15,634 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:07:15,643 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,643 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,644 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,644 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,647 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,653 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,654 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... [2018-10-27 09:07:15,655 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:07:15,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:07:15,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:07:15,656 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:07:15,657 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:07:15,785 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:07:15,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:07:15,786 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:07:15,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:07:15,786 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:07:15,787 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:07:15,787 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:07:15,787 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:07:15,987 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:07:15,990 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:07:15 BoogieIcfgContainer [2018-10-27 09:07:15,990 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:07:15,991 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:07:15,991 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:07:15,995 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:07:15,995 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:07:15" (1/3) ... [2018-10-27 09:07:15,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bd7bab3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:07:15, skipping insertion in model container [2018-10-27 09:07:15,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:15" (2/3) ... [2018-10-27 09:07:15,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bd7bab3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:07:15, skipping insertion in model container [2018-10-27 09:07:15,997 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:07:15" (3/3) ... [2018-10-27 09:07:15,999 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_false-unreach-call1.i [2018-10-27 09:07:16,008 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:07:16,016 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:07:16,031 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:07:16,062 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:07:16,062 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:07:16,062 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:07:16,062 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:07:16,063 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:07:16,063 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:07:16,063 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:07:16,063 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:07:16,082 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-27 09:07:16,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 09:07:16,088 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:16,089 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:16,092 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:16,098 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:16,098 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-27 09:07:16,101 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:16,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:16,152 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:16,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:16,152 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:16,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:16,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:16,217 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:07:16,218 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:07:16,218 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:16,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:07:16,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:07:16,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:07:16,244 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-27 09:07:16,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:16,275 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-27 09:07:16,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:07:16,276 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 09:07:16,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:16,283 INFO L225 Difference]: With dead ends: 30 [2018-10-27 09:07:16,283 INFO L226 Difference]: Without dead ends: 13 [2018-10-27 09:07:16,287 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:07:16,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-27 09:07:16,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-27 09:07:16,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-27 09:07:16,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-27 09:07:16,324 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-27 09:07:16,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:16,324 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-27 09:07:16,324 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:07:16,324 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-27 09:07:16,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 09:07:16,325 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:16,325 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:16,326 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:16,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:16,326 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-27 09:07:16,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:16,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:16,328 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:16,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:16,328 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:16,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:16,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:16,492 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:07:16,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 09:07:16,492 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:16,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:07:16,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:07:16,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:07:16,496 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-27 09:07:16,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:16,576 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-27 09:07:16,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:07:16,577 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 09:07:16,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:16,578 INFO L225 Difference]: With dead ends: 24 [2018-10-27 09:07:16,578 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 09:07:16,579 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:07:16,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 09:07:16,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-27 09:07:16,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-27 09:07:16,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-27 09:07:16,588 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-27 09:07:16,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:16,589 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-27 09:07:16,589 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:07:16,589 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-27 09:07:16,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 09:07:16,596 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:16,596 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:16,597 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:16,597 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:16,597 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-27 09:07:16,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:16,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:16,604 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:16,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:16,604 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:16,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:16,740 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:16,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:16,741 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:16,742 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-27 09:07:16,744 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-27 09:07:16,778 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:07:16,778 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:07:16,933 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:07:16,935 INFO L272 AbstractInterpreter]: Visited 13 different actions 21 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-27 09:07:16,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:16,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:07:16,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:16,974 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:16,988 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:16,988 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:17,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:17,018 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:17,085 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:17,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:17,164 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:17,188 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:17,189 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 09:07:17,189 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:17,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 09:07:17,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 09:07:17,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:07:17,190 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-10-27 09:07:17,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:17,264 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-10-27 09:07:17,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 09:07:17,265 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-27 09:07:17,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:17,265 INFO L225 Difference]: With dead ends: 27 [2018-10-27 09:07:17,266 INFO L226 Difference]: Without dead ends: 19 [2018-10-27 09:07:17,266 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:07:17,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-27 09:07:17,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-27 09:07:17,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-27 09:07:17,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-27 09:07:17,271 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-27 09:07:17,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:17,272 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-27 09:07:17,272 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 09:07:17,272 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-27 09:07:17,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 09:07:17,273 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:17,273 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:17,274 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:17,274 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:17,274 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-27 09:07:17,274 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:17,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:17,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:17,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:17,276 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:17,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:17,467 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:17,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:17,468 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:17,468 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:17,468 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:17,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:17,469 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:17,477 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:17,478 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:17,498 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-27 09:07:17,498 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:17,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:17,633 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-27 09:07:17,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:17,738 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-27 09:07:17,761 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-27 09:07:17,762 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 7 [2018-10-27 09:07:17,762 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:17,762 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:07:17,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:07:17,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:07:17,763 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 3 states. [2018-10-27 09:07:17,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:17,793 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-10-27 09:07:17,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:07:17,796 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-27 09:07:17,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:17,797 INFO L225 Difference]: With dead ends: 27 [2018-10-27 09:07:17,797 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 09:07:17,798 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:07:17,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 09:07:17,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-27 09:07:17,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-27 09:07:17,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-27 09:07:17,803 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2018-10-27 09:07:17,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:17,803 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-27 09:07:17,804 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:07:17,804 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-27 09:07:17,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-27 09:07:17,805 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:17,805 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:17,805 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:17,806 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:17,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1801011421, now seen corresponding path program 1 times [2018-10-27 09:07:17,806 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:17,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:17,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:17,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:17,808 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:17,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:17,996 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:17,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:17,997 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:17,997 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-10-27 09:07:17,998 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-27 09:07:17,999 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:07:17,999 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:07:18,042 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:07:18,042 INFO L272 AbstractInterpreter]: Visited 14 different actions 24 times. Merged at 3 different actions 6 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-27 09:07:18,049 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:18,049 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:07:18,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:18,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:18,060 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:18,060 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:18,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:18,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:18,129 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:18,129 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:18,427 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:18,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:18,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2018-10-27 09:07:18,450 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:18,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 09:07:18,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 09:07:18,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-10-27 09:07:18,451 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-10-27 09:07:18,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:18,499 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-27 09:07:18,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:07:18,499 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-27 09:07:18,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:18,501 INFO L225 Difference]: With dead ends: 34 [2018-10-27 09:07:18,501 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 09:07:18,502 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-10-27 09:07:18,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 09:07:18,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-27 09:07:18,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 09:07:18,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-27 09:07:18,508 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-10-27 09:07:18,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:18,509 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-27 09:07:18,509 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 09:07:18,509 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-27 09:07:18,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 09:07:18,510 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:18,510 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:18,511 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:18,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:18,511 INFO L82 PathProgramCache]: Analyzing trace with hash -2092450784, now seen corresponding path program 2 times [2018-10-27 09:07:18,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:18,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:18,512 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:18,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:18,513 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:18,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:18,645 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:18,646 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:18,646 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:18,646 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:18,646 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:18,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:18,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:18,656 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:18,656 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:18,709 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 09:07:18,709 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:18,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:19,071 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-27 09:07:19,072 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:19,204 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-27 09:07:19,227 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:19,227 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 11 [2018-10-27 09:07:19,227 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:19,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:07:19,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:07:19,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-10-27 09:07:19,228 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 9 states. [2018-10-27 09:07:19,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:19,406 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2018-10-27 09:07:19,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 09:07:19,408 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 09:07:19,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:19,409 INFO L225 Difference]: With dead ends: 44 [2018-10-27 09:07:19,409 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 09:07:19,410 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:07:19,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 09:07:19,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-10-27 09:07:19,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 09:07:19,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-27 09:07:19,417 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2018-10-27 09:07:19,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:19,418 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-27 09:07:19,418 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:07:19,418 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-27 09:07:19,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 09:07:19,419 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:19,419 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:19,419 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:19,420 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:19,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1050905282, now seen corresponding path program 3 times [2018-10-27 09:07:19,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:19,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:19,421 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:19,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:19,422 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:19,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:19,697 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:19,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:19,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:19,699 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:19,699 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:19,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:19,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:19,710 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:19,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:19,727 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:19,727 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:19,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:19,784 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:07:19,784 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:20,176 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:07:20,197 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:20,197 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 15 [2018-10-27 09:07:20,197 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:20,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:07:20,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:07:20,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:07:20,198 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2018-10-27 09:07:20,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:20,301 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-10-27 09:07:20,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 09:07:20,302 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-27 09:07:20,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:20,303 INFO L225 Difference]: With dead ends: 46 [2018-10-27 09:07:20,303 INFO L226 Difference]: Without dead ends: 33 [2018-10-27 09:07:20,304 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:07:20,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-27 09:07:20,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-27 09:07:20,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-27 09:07:20,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-27 09:07:20,309 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2018-10-27 09:07:20,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:20,310 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-27 09:07:20,310 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:07:20,310 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-27 09:07:20,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-27 09:07:20,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:20,311 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:20,312 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:20,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:20,312 INFO L82 PathProgramCache]: Analyzing trace with hash -306121381, now seen corresponding path program 4 times [2018-10-27 09:07:20,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:20,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:20,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:20,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:20,314 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:20,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:21,056 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:21,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:21,057 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:21,057 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:21,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:21,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:21,057 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:21,065 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:21,065 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:21,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:21,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:21,116 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:07:21,117 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:21,485 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:07:21,506 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:21,506 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 17 [2018-10-27 09:07:21,506 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:21,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 09:07:21,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 09:07:21,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:07:21,508 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2018-10-27 09:07:21,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:21,694 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-10-27 09:07:21,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:07:21,695 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-27 09:07:21,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:21,696 INFO L225 Difference]: With dead ends: 49 [2018-10-27 09:07:21,696 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 09:07:21,697 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:07:21,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 09:07:21,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-27 09:07:21,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 09:07:21,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-10-27 09:07:21,703 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2018-10-27 09:07:21,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:21,703 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-10-27 09:07:21,704 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 09:07:21,704 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-10-27 09:07:21,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 09:07:21,705 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:21,705 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:21,705 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:21,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:21,706 INFO L82 PathProgramCache]: Analyzing trace with hash -249977826, now seen corresponding path program 5 times [2018-10-27 09:07:21,706 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:21,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:21,707 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:21,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:21,707 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:21,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:21,891 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:21,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:21,892 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:21,892 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:21,892 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:21,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:21,892 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:21,902 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:21,902 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:21,920 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 09:07:21,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:21,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:22,028 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 09:07:22,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:22,100 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 09:07:22,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:22,123 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 5] total 17 [2018-10-27 09:07:22,123 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:22,123 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:07:22,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:07:22,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=187, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:07:22,124 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2018-10-27 09:07:24,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:24,657 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-10-27 09:07:24,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:07:24,657 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2018-10-27 09:07:24,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:24,658 INFO L225 Difference]: With dead ends: 62 [2018-10-27 09:07:24,658 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 09:07:24,659 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:07:24,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 09:07:24,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2018-10-27 09:07:24,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 09:07:24,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2018-10-27 09:07:24,666 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2018-10-27 09:07:24,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:24,666 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2018-10-27 09:07:24,666 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:07:24,667 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2018-10-27 09:07:24,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 09:07:24,668 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:24,668 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:24,668 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:24,668 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:24,668 INFO L82 PathProgramCache]: Analyzing trace with hash 607533056, now seen corresponding path program 6 times [2018-10-27 09:07:24,669 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:24,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:24,670 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:24,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:24,670 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:24,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:24,928 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:24,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:24,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:24,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:24,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:24,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:24,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:24,939 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:24,939 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:24,954 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:24,954 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:24,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:25,014 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:25,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:25,709 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:25,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:25,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 24 [2018-10-27 09:07:25,732 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:25,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:07:25,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:07:25,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:07:25,735 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 13 states. [2018-10-27 09:07:25,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:25,929 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2018-10-27 09:07:25,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:07:25,929 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-27 09:07:25,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:25,932 INFO L225 Difference]: With dead ends: 61 [2018-10-27 09:07:25,933 INFO L226 Difference]: Without dead ends: 45 [2018-10-27 09:07:25,934 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:07:25,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-27 09:07:25,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-10-27 09:07:25,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-27 09:07:25,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-10-27 09:07:25,941 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2018-10-27 09:07:25,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:25,941 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-10-27 09:07:25,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:07:25,941 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-10-27 09:07:25,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 09:07:25,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:25,942 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:25,943 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:25,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:25,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1655862429, now seen corresponding path program 7 times [2018-10-27 09:07:25,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:25,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:25,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:25,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:25,944 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:25,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:26,315 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:26,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:26,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:26,316 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:26,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:26,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:26,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:26,324 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:26,324 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:26,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:26,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:26,600 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 09:07:26,601 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:27,211 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 09:07:27,232 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:27,233 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12] total 24 [2018-10-27 09:07:27,233 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:27,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:07:27,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:07:27,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:07:27,235 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 14 states. [2018-10-27 09:07:27,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:27,461 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2018-10-27 09:07:27,461 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:07:27,462 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-27 09:07:27,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:27,463 INFO L225 Difference]: With dead ends: 64 [2018-10-27 09:07:27,463 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 09:07:27,464 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:07:27,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 09:07:27,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-27 09:07:27,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 09:07:27,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-10-27 09:07:27,471 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 44 [2018-10-27 09:07:27,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:27,471 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-10-27 09:07:27,471 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:07:27,471 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-10-27 09:07:27,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 09:07:27,472 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:27,472 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:27,473 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:27,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:27,473 INFO L82 PathProgramCache]: Analyzing trace with hash -565963040, now seen corresponding path program 8 times [2018-10-27 09:07:27,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:27,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:27,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:27,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:27,475 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:27,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:27,926 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:27,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:27,927 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:27,927 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:27,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:27,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:27,927 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:27,936 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:27,937 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:27,954 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 09:07:27,955 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:27,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:28,064 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 09:07:28,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:28,235 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 09:07:28,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:28,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6] total 23 [2018-10-27 09:07:28,266 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:28,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:07:28,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:07:28,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=359, Unknown=0, NotChecked=0, Total=506 [2018-10-27 09:07:28,268 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 19 states. [2018-10-27 09:07:31,073 WARN L179 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2018-10-27 09:07:31,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:31,311 INFO L93 Difference]: Finished difference Result 74 states and 85 transitions. [2018-10-27 09:07:31,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:07:31,311 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2018-10-27 09:07:31,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:31,312 INFO L225 Difference]: With dead ends: 74 [2018-10-27 09:07:31,312 INFO L226 Difference]: Without dead ends: 58 [2018-10-27 09:07:31,313 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=195, Invalid=455, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:07:31,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-27 09:07:31,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-10-27 09:07:31,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 09:07:31,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-10-27 09:07:31,320 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 47 [2018-10-27 09:07:31,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:31,320 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-10-27 09:07:31,320 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:07:31,320 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-10-27 09:07:31,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 09:07:31,321 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:31,321 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:31,322 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:31,322 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:31,322 INFO L82 PathProgramCache]: Analyzing trace with hash -829748866, now seen corresponding path program 9 times [2018-10-27 09:07:31,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:31,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:31,323 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:31,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:31,323 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:31,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:31,629 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:31,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:31,629 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:31,629 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:31,630 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:31,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:31,630 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:31,644 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:31,644 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:31,683 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:31,683 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:31,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:31,988 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:07:31,988 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:32,702 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:07:32,725 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:32,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 14] total 29 [2018-10-27 09:07:32,725 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:32,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:07:32,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:07:32,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:07:32,727 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 17 states. [2018-10-27 09:07:33,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:33,119 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2018-10-27 09:07:33,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:07:33,119 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-27 09:07:33,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:33,120 INFO L225 Difference]: With dead ends: 76 [2018-10-27 09:07:33,121 INFO L226 Difference]: Without dead ends: 57 [2018-10-27 09:07:33,121 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 93 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:07:33,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-27 09:07:33,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-27 09:07:33,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-27 09:07:33,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2018-10-27 09:07:33,130 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 53 [2018-10-27 09:07:33,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:33,131 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2018-10-27 09:07:33,131 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:07:33,131 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2018-10-27 09:07:33,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-27 09:07:33,132 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:33,132 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:33,132 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:33,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:33,133 INFO L82 PathProgramCache]: Analyzing trace with hash 786973339, now seen corresponding path program 10 times [2018-10-27 09:07:33,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:33,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:33,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,134 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:33,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:33,595 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:33,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:33,595 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:33,595 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:33,596 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:33,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:33,596 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:33,605 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:33,605 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:33,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:33,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:33,698 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:07:33,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:34,649 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:07:34,669 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:34,669 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 15] total 31 [2018-10-27 09:07:34,669 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:34,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 09:07:34,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 09:07:34,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:07:34,671 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 18 states. [2018-10-27 09:07:35,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:35,069 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2018-10-27 09:07:35,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:07:35,069 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-27 09:07:35,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:35,070 INFO L225 Difference]: With dead ends: 79 [2018-10-27 09:07:35,070 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 09:07:35,071 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 98 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:07:35,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 09:07:35,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-27 09:07:35,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-27 09:07:35,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-10-27 09:07:35,079 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2018-10-27 09:07:35,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:35,079 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-10-27 09:07:35,079 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 09:07:35,080 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-10-27 09:07:35,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-27 09:07:35,081 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:35,081 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:35,081 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:35,081 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:35,081 INFO L82 PathProgramCache]: Analyzing trace with hash 794925150, now seen corresponding path program 11 times [2018-10-27 09:07:35,081 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:35,082 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:35,082 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:35,082 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:35,083 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:35,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:35,581 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:35,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:35,581 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:35,581 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:35,581 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:35,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:35,581 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:35,590 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:35,590 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:35,612 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 09:07:35,612 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:35,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:35,806 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-27 09:07:35,806 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:35,977 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-27 09:07:35,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:35,999 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 7, 7] total 29 [2018-10-27 09:07:35,999 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:35,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 09:07:36,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 09:07:36,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=587, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:07:36,001 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 24 states. [2018-10-27 09:07:40,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:40,183 INFO L93 Difference]: Finished difference Result 92 states and 106 transitions. [2018-10-27 09:07:40,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:07:40,184 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-10-27 09:07:40,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:40,185 INFO L225 Difference]: With dead ends: 92 [2018-10-27 09:07:40,185 INFO L226 Difference]: Without dead ends: 73 [2018-10-27 09:07:40,186 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=327, Invalid=795, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 09:07:40,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-27 09:07:40,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 66. [2018-10-27 09:07:40,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-27 09:07:40,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2018-10-27 09:07:40,195 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 59 [2018-10-27 09:07:40,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:40,195 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2018-10-27 09:07:40,195 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 09:07:40,195 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2018-10-27 09:07:40,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 09:07:40,197 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:40,197 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:40,197 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:40,198 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:40,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1319222592, now seen corresponding path program 12 times [2018-10-27 09:07:40,198 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:40,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:40,199 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:40,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:40,199 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:40,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:40,719 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:40,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:40,719 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:40,720 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:40,720 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:40,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:40,720 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:40,728 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:40,728 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:40,761 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:40,761 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:40,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:40,894 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:07:40,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:42,078 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:07:42,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:42,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 17] total 36 [2018-10-27 09:07:42,100 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:42,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:07:42,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:07:42,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:07:42,101 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 21 states. [2018-10-27 09:07:42,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:42,684 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2018-10-27 09:07:42,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 09:07:42,684 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-27 09:07:42,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:42,686 INFO L225 Difference]: With dead ends: 91 [2018-10-27 09:07:42,686 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 09:07:42,687 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 114 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:07:42,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 09:07:42,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-27 09:07:42,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-27 09:07:42,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2018-10-27 09:07:42,696 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 65 [2018-10-27 09:07:42,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:42,696 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2018-10-27 09:07:42,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:07:42,696 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2018-10-27 09:07:42,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-27 09:07:42,697 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:42,697 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:42,698 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:42,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:42,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1618626467, now seen corresponding path program 13 times [2018-10-27 09:07:42,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:42,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:42,699 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:42,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:42,699 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:42,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:43,060 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:43,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:43,061 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:43,061 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:43,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:43,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:43,061 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:43,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:43,070 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:43,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:43,099 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:43,149 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:07:43,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:44,519 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:07:44,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:44,540 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 18] total 38 [2018-10-27 09:07:44,540 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:44,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 09:07:44,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 09:07:44,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:07:44,541 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand 22 states. [2018-10-27 09:07:45,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:45,283 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2018-10-27 09:07:45,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:07:45,284 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-27 09:07:45,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:45,285 INFO L225 Difference]: With dead ends: 94 [2018-10-27 09:07:45,285 INFO L226 Difference]: Without dead ends: 72 [2018-10-27 09:07:45,286 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:07:45,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-27 09:07:45,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-27 09:07:45,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-27 09:07:45,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-10-27 09:07:45,294 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 68 [2018-10-27 09:07:45,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:45,294 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-10-27 09:07:45,294 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 09:07:45,295 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-10-27 09:07:45,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-27 09:07:45,296 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:45,296 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:45,296 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:45,296 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:45,296 INFO L82 PathProgramCache]: Analyzing trace with hash -512392800, now seen corresponding path program 14 times [2018-10-27 09:07:45,296 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:45,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:45,297 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:45,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:45,298 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:45,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:46,216 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:46,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:46,217 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:46,217 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:46,217 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:46,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:46,217 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:46,226 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:46,227 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:46,266 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 09:07:46,266 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:46,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:46,536 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 09:07:46,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:46,800 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 09:07:46,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:46,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 8, 8] total 35 [2018-10-27 09:07:46,822 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:46,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 09:07:46,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 09:07:46,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=871, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 09:07:46,823 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 29 states. [2018-10-27 09:07:53,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:53,504 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2018-10-27 09:07:53,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:07:53,504 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 71 [2018-10-27 09:07:53,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:53,505 INFO L225 Difference]: With dead ends: 104 [2018-10-27 09:07:53,505 INFO L226 Difference]: Without dead ends: 82 [2018-10-27 09:07:53,506 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 135 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=439, Invalid=1121, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:07:53,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-27 09:07:53,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2018-10-27 09:07:53,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-27 09:07:53,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2018-10-27 09:07:53,513 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 71 [2018-10-27 09:07:53,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:53,513 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2018-10-27 09:07:53,513 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 09:07:53,513 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2018-10-27 09:07:53,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-27 09:07:53,516 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:53,516 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:53,516 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:53,516 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:53,516 INFO L82 PathProgramCache]: Analyzing trace with hash 2099613118, now seen corresponding path program 15 times [2018-10-27 09:07:53,516 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:53,517 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:53,517 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:53,517 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:53,518 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:53,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:54,222 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:54,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:54,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:54,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:54,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:54,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:54,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:54,230 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:54,230 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:54,262 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:54,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:54,265 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:54,473 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 09:07:54,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:57,295 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 09:07:57,316 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:57,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 23] total 46 [2018-10-27 09:07:57,316 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:57,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 09:07:57,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 09:07:57,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:07:57,318 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 25 states. [2018-10-27 09:07:57,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:57,940 INFO L93 Difference]: Finished difference Result 109 states and 123 transitions. [2018-10-27 09:07:57,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:07:57,941 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-10-27 09:07:57,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:57,942 INFO L225 Difference]: With dead ends: 109 [2018-10-27 09:07:57,942 INFO L226 Difference]: Without dead ends: 84 [2018-10-27 09:07:57,943 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:07:57,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-27 09:07:57,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-10-27 09:07:57,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-27 09:07:57,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2018-10-27 09:07:57,951 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 77 [2018-10-27 09:07:57,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:57,951 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2018-10-27 09:07:57,951 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 09:07:57,952 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2018-10-27 09:07:57,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-27 09:07:57,953 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:57,953 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:57,953 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:57,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:57,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1326089058, now seen corresponding path program 16 times [2018-10-27 09:07:57,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:57,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:57,955 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:57,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:57,955 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:57,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:59,133 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:59,133 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:59,133 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:59,134 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:59,134 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:59,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:59,134 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:59,148 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:59,148 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:59,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:59,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:59,224 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-27 09:07:59,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:01,195 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-27 09:08:01,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:01,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21, 22] total 47 [2018-10-27 09:08:01,216 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:01,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:08:01,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:08:01,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=1546, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 09:08:01,218 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 27 states. [2018-10-27 09:08:01,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:01,864 INFO L93 Difference]: Finished difference Result 115 states and 129 transitions. [2018-10-27 09:08:01,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:08:01,864 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-27 09:08:01,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:01,865 INFO L225 Difference]: With dead ends: 115 [2018-10-27 09:08:01,865 INFO L226 Difference]: Without dead ends: 90 [2018-10-27 09:08:01,866 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=616, Invalid=1546, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 09:08:01,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-27 09:08:01,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-10-27 09:08:01,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-27 09:08:01,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2018-10-27 09:08:01,875 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 83 [2018-10-27 09:08:01,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:01,875 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2018-10-27 09:08:01,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:08:01,875 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2018-10-27 09:08:01,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-27 09:08:01,879 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:01,879 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:01,879 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:01,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:01,880 INFO L82 PathProgramCache]: Analyzing trace with hash -502348930, now seen corresponding path program 17 times [2018-10-27 09:08:01,880 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:01,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:01,881 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:01,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:01,881 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:01,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:02,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 52 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:02,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:02,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:02,818 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:02,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:02,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:02,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:02,827 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:02,827 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:02,890 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 09:08:02,890 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:02,892 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:03,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-27 09:08:03,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:03,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-27 09:08:03,896 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:03,896 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 9, 9] total 43 [2018-10-27 09:08:03,896 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:03,896 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 09:08:03,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 09:08:03,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:08:03,897 INFO L87 Difference]: Start difference. First operand 90 states and 96 transitions. Second operand 36 states. [2018-10-27 09:08:08,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:08,549 INFO L93 Difference]: Finished difference Result 128 states and 146 transitions. [2018-10-27 09:08:08,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 09:08:08,550 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 89 [2018-10-27 09:08:08,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:08,551 INFO L225 Difference]: With dead ends: 128 [2018-10-27 09:08:08,551 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 09:08:08,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=690, Invalid=1760, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 09:08:08,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 09:08:08,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2018-10-27 09:08:08,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-27 09:08:08,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2018-10-27 09:08:08,561 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 89 [2018-10-27 09:08:08,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:08,562 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2018-10-27 09:08:08,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 09:08:08,562 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2018-10-27 09:08:08,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-27 09:08:08,563 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:08,563 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:08,563 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:08,563 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:08,563 INFO L82 PathProgramCache]: Analyzing trace with hash -2002812611, now seen corresponding path program 18 times [2018-10-27 09:08:08,563 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:08,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:08,564 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:08,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:08,564 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:08,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:09,286 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 140 proven. 1134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:08:09,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:09,287 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:09,287 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:09,287 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:09,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:09,287 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:09,302 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:09,302 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:09,330 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:09,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:09,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:09,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 09:08:09,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:12,804 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 09:08:12,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:12,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 25, 26] total 55 [2018-10-27 09:08:12,825 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:12,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 09:08:12,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 09:08:12,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:08:12,826 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand 31 states. [2018-10-27 09:08:13,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:13,747 INFO L93 Difference]: Finished difference Result 133 states and 149 transitions. [2018-10-27 09:08:13,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 09:08:13,751 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 98 [2018-10-27 09:08:13,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:13,753 INFO L225 Difference]: With dead ends: 133 [2018-10-27 09:08:13,753 INFO L226 Difference]: Without dead ends: 105 [2018-10-27 09:08:13,754 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:08:13,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-27 09:08:13,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2018-10-27 09:08:13,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-27 09:08:13,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2018-10-27 09:08:13,764 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 98 [2018-10-27 09:08:13,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:13,764 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2018-10-27 09:08:13,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 09:08:13,764 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2018-10-27 09:08:13,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-27 09:08:13,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:13,765 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:13,766 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:13,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:13,766 INFO L82 PathProgramCache]: Analyzing trace with hash 615751261, now seen corresponding path program 19 times [2018-10-27 09:08:13,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:13,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:13,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:13,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:13,767 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:13,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:14,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 150 proven. 1305 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:08:14,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:14,436 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:14,436 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:14,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:14,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:14,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 09:08:14,444 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:14,444 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:14,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:14,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:14,540 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 09:08:14,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:18,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 09:08:18,327 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:18,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 27, 28] total 59 [2018-10-27 09:08:18,327 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:18,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 09:08:18,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 09:08:18,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=2470, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 09:08:18,329 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand 33 states. [2018-10-27 09:08:19,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:19,421 INFO L93 Difference]: Finished difference Result 139 states and 155 transitions. [2018-10-27 09:08:19,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 09:08:19,422 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 104 [2018-10-27 09:08:19,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:19,423 INFO L225 Difference]: With dead ends: 139 [2018-10-27 09:08:19,423 INFO L226 Difference]: Without dead ends: 111 [2018-10-27 09:08:19,426 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 181 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=952, Invalid=2470, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 09:08:19,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-27 09:08:19,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2018-10-27 09:08:19,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-27 09:08:19,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 118 transitions. [2018-10-27 09:08:19,436 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 118 transitions. Word has length 104 [2018-10-27 09:08:19,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:19,437 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 118 transitions. [2018-10-27 09:08:19,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 09:08:19,437 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 118 transitions. [2018-10-27 09:08:19,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-27 09:08:19,438 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:19,438 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:19,438 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:19,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:19,438 INFO L82 PathProgramCache]: Analyzing trace with hash 323314557, now seen corresponding path program 20 times [2018-10-27 09:08:19,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:19,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:19,439 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:19,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:19,440 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:19,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:21,029 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 160 proven. 1488 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:08:21,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:21,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:21,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:21,030 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:21,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:21,030 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:21,039 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:21,039 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:46,836 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 09:08:46,836 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:47,718 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:48,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-27 09:08:48,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:48,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-27 09:08:48,798 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:48,798 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 10, 10] total 51 [2018-10-27 09:08:48,798 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:48,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 09:08:48,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 09:08:48,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=1899, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:08:48,801 INFO L87 Difference]: Start difference. First operand 111 states and 118 transitions. Second operand 43 states. [2018-10-27 09:09:02,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:02,071 INFO L93 Difference]: Finished difference Result 152 states and 172 transitions. [2018-10-27 09:09:02,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 09:09:02,071 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 110 [2018-10-27 09:09:02,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:02,072 INFO L225 Difference]: With dead ends: 152 [2018-10-27 09:09:02,073 INFO L226 Difference]: Without dead ends: 124 [2018-10-27 09:09:02,074 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 211 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=939, Invalid=2483, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 09:09:02,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-27 09:09:02,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2018-10-27 09:09:02,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-27 09:09:02,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 128 transitions. [2018-10-27 09:09:02,085 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 128 transitions. Word has length 110 [2018-10-27 09:09:02,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:02,085 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 128 transitions. [2018-10-27 09:09:02,085 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 09:09:02,085 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 128 transitions. [2018-10-27 09:09:02,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-27 09:09:02,086 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:02,086 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:02,086 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:02,087 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:02,087 INFO L82 PathProgramCache]: Analyzing trace with hash -1376389474, now seen corresponding path program 21 times [2018-10-27 09:09:02,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:02,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:02,088 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:02,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:02,088 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:02,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:03,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:03,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:03,118 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:03,118 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:03,119 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:03,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:03,119 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 09:09:03,133 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:09:03,133 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:09:03,165 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:09:03,165 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:09:03,168 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:03,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 1218 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:09:03,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:08,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 1218 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:09:08,487 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:08,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 31, 32] total 69 [2018-10-27 09:09:08,488 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:08,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 09:09:08,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 09:09:08,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1246, Invalid=3446, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 09:09:08,490 INFO L87 Difference]: Start difference. First operand 120 states and 128 transitions. Second operand 39 states. [2018-10-27 09:09:10,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:10,018 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2018-10-27 09:09:10,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 09:09:10,019 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-10-27 09:09:10,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:10,020 INFO L225 Difference]: With dead ends: 154 [2018-10-27 09:09:10,020 INFO L226 Difference]: Without dead ends: 123 [2018-10-27 09:09:10,021 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=1246, Invalid=3446, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 09:09:10,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-27 09:09:10,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2018-10-27 09:09:10,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-27 09:09:10,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 131 transitions. [2018-10-27 09:09:10,031 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 131 transitions. Word has length 119 [2018-10-27 09:09:10,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:10,031 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 131 transitions. [2018-10-27 09:09:10,032 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 09:09:10,032 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 131 transitions. [2018-10-27 09:09:10,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-27 09:09:10,032 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:10,033 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:10,033 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:10,033 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:10,033 INFO L82 PathProgramCache]: Analyzing trace with hash -57936773, now seen corresponding path program 22 times [2018-10-27 09:09:10,033 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:10,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:10,034 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:10,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:10,034 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:10,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:12,201 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:12,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:12,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:12,202 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:12,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:12,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:12,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:09:12,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:12,219 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:09:12,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:12,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:12,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 690 proven. 1305 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:09:12,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:16,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 690 proven. 1305 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:09:16,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:16,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 32, 33] total 71 [2018-10-27 09:09:16,867 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:16,868 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 09:09:16,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 09:09:16,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1318, Invalid=3652, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 09:09:16,870 INFO L87 Difference]: Start difference. First operand 123 states and 131 transitions. Second operand 40 states. [2018-10-27 09:09:18,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:18,549 INFO L93 Difference]: Finished difference Result 157 states and 174 transitions. [2018-10-27 09:09:18,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 09:09:18,550 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-10-27 09:09:18,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:18,551 INFO L225 Difference]: With dead ends: 157 [2018-10-27 09:09:18,551 INFO L226 Difference]: Without dead ends: 126 [2018-10-27 09:09:18,553 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 212 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=1318, Invalid=3652, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 09:09:18,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-27 09:09:18,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-10-27 09:09:18,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-27 09:09:18,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 134 transitions. [2018-10-27 09:09:18,564 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 134 transitions. Word has length 122 [2018-10-27 09:09:18,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:18,565 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 134 transitions. [2018-10-27 09:09:18,565 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 09:09:18,565 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 134 transitions. [2018-10-27 09:09:18,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-27 09:09:18,566 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:18,566 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 30, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:18,566 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:18,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:18,567 INFO L82 PathProgramCache]: Analyzing trace with hash 490556798, now seen corresponding path program 23 times [2018-10-27 09:09:18,567 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:18,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:18,568 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:18,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:18,568 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:18,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:19,523 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:19,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:19,524 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:19,524 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:19,524 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:19,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:19,524 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 09:09:19,532 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:09:19,532 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:10:27,733 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 09:10:27,733 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:10:28,074 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:10:28,773 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 780 proven. 100 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-27 09:10:28,773 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:10:29,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 780 proven. 100 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-27 09:10:29,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:10:29,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 11, 11] total 59 [2018-10-27 09:10:29,428 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:10:29,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-27 09:10:29,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-27 09:10:29,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=817, Invalid=2605, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 09:10:29,430 INFO L87 Difference]: Start difference. First operand 126 states and 134 transitions. Second operand 50 states. [2018-10-27 09:10:47,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:10:47,429 INFO L93 Difference]: Finished difference Result 167 states and 188 transitions. [2018-10-27 09:10:47,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 09:10:47,429 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 125 [2018-10-27 09:10:47,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:10:47,430 INFO L225 Difference]: With dead ends: 167 [2018-10-27 09:10:47,430 INFO L226 Difference]: Without dead ends: 136 [2018-10-27 09:10:47,431 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 240 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=1153, Invalid=3269, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:10:47,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-27 09:10:47,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 132. [2018-10-27 09:10:47,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-27 09:10:47,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 141 transitions. [2018-10-27 09:10:47,441 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 141 transitions. Word has length 125 [2018-10-27 09:10:47,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:10:47,441 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 141 transitions. [2018-10-27 09:10:47,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-27 09:10:47,441 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 141 transitions. [2018-10-27 09:10:47,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-27 09:10:47,441 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:10:47,442 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:10:47,442 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:10:47,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:10:47,442 INFO L82 PathProgramCache]: Analyzing trace with hash -2039378720, now seen corresponding path program 24 times [2018-10-27 09:10:47,442 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:10:47,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:47,443 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:10:47,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:47,443 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:10:47,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:10:48,476 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:48,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:48,476 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:10:48,476 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:10:48,477 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:10:48,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:48,477 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:10:48,484 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:10:48,484 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:10:48,521 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:10:48,521 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:10:48,524 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:10:48,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 832 proven. 1488 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-27 09:10:48,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:10:54,982 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 832 proven. 1488 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-27 09:10:55,003 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:10:55,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 34, 35] total 76 [2018-10-27 09:10:55,003 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:10:55,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 09:10:55,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 09:10:55,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1503, Invalid=4197, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 09:10:55,005 INFO L87 Difference]: Start difference. First operand 132 states and 141 transitions. Second operand 43 states. [2018-10-27 09:10:56,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:10:56,865 INFO L93 Difference]: Finished difference Result 169 states and 188 transitions. [2018-10-27 09:10:56,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 09:10:56,865 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-10-27 09:10:56,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:10:56,867 INFO L225 Difference]: With dead ends: 169 [2018-10-27 09:10:56,867 INFO L226 Difference]: Without dead ends: 135 [2018-10-27 09:10:56,869 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 228 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1503, Invalid=4197, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 09:10:56,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-27 09:10:56,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2018-10-27 09:10:56,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-27 09:10:56,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 144 transitions. [2018-10-27 09:10:56,883 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 144 transitions. Word has length 131 [2018-10-27 09:10:56,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:10:56,883 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 144 transitions. [2018-10-27 09:10:56,883 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 09:10:56,883 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 144 transitions. [2018-10-27 09:10:56,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-27 09:10:56,884 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:10:56,884 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:10:56,884 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:10:56,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:10:56,884 INFO L82 PathProgramCache]: Analyzing trace with hash 34645821, now seen corresponding path program 25 times [2018-10-27 09:10:56,885 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:10:56,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:56,885 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:10:56,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:56,885 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:10:56,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:10:58,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:58,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:58,549 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:10:58,550 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:10:58,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:10:58,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:58,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:10:58,558 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:10:58,558 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:10:58,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:10:58,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:10:58,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 858 proven. 1584 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-27 09:10:58,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:04,606 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 858 proven. 1584 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-27 09:11:04,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:04,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 35, 36] total 78 [2018-10-27 09:11:04,628 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:04,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 09:11:04,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 09:11:04,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1582, Invalid=4424, Unknown=0, NotChecked=0, Total=6006 [2018-10-27 09:11:04,630 INFO L87 Difference]: Start difference. First operand 135 states and 144 transitions. Second operand 44 states. [2018-10-27 09:11:06,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:06,657 INFO L93 Difference]: Finished difference Result 172 states and 191 transitions. [2018-10-27 09:11:06,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 09:11:06,657 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-10-27 09:11:06,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:06,659 INFO L225 Difference]: With dead ends: 172 [2018-10-27 09:11:06,659 INFO L226 Difference]: Without dead ends: 138 [2018-10-27 09:11:06,660 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1582, Invalid=4424, Unknown=0, NotChecked=0, Total=6006 [2018-10-27 09:11:06,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-10-27 09:11:06,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2018-10-27 09:11:06,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-27 09:11:06,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 147 transitions. [2018-10-27 09:11:06,670 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 147 transitions. Word has length 134 [2018-10-27 09:11:06,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:06,671 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 147 transitions. [2018-10-27 09:11:06,671 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 09:11:06,671 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 147 transitions. [2018-10-27 09:11:06,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-27 09:11:06,672 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:06,672 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:06,672 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:06,672 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:06,672 INFO L82 PathProgramCache]: Analyzing trace with hash -99773504, now seen corresponding path program 26 times [2018-10-27 09:11:06,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:06,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:06,673 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:11:06,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:06,673 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:06,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:07,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:07,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:07,966 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:07,966 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:07,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:07,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:07,966 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:11:07,975 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:11:07,975 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown