java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:09:41,940 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:09:41,945 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:09:41,960 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:09:41,960 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:09:41,961 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:09:41,962 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:09:41,964 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:09:41,966 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:09:41,967 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:09:41,968 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:09:41,968 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:09:41,969 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:09:41,970 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:09:41,971 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:09:41,972 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:09:41,972 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:09:41,975 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:09:41,977 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:09:41,978 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:09:41,979 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:09:41,981 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:09:41,983 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:09:41,983 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:09:41,983 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:09:41,984 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:09:41,985 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:09:41,986 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:09:41,987 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:09:41,988 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:09:41,988 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:09:41,989 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:09:41,991 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:09:42,020 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:09:42,021 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:09:42,022 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:09:42,022 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:09:42,022 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:09:42,022 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:09:42,022 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:09:42,023 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:09:42,025 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:09:42,025 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:09:42,025 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:09:42,025 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:09:42,026 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:09:42,026 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:09:42,026 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:09:42,027 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:09:42,027 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:09:42,027 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:09:42,027 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:09:42,027 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:09:42,028 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:09:42,028 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:09:42,028 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:09:42,028 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:09:42,028 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:09:42,030 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:09:42,030 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:09:42,030 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:09:42,030 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:09:42,031 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:09:42,031 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:09:42,031 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:09:42,031 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:09:42,031 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:09:42,083 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:09:42,099 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:09:42,102 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:09:42,103 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:09:42,104 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:09:42,104 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-24 12:09:42,161 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/fbd21e1bf/c1c14b542aea45c1a3654e8a5d84d3ad/FLAG8bdaa03e4 [2018-10-24 12:09:42,579 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:09:42,580 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-24 12:09:42,590 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/fbd21e1bf/c1c14b542aea45c1a3654e8a5d84d3ad/FLAG8bdaa03e4 [2018-10-24 12:09:42,606 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/fbd21e1bf/c1c14b542aea45c1a3654e8a5d84d3ad [2018-10-24 12:09:42,617 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:09:42,618 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:09:42,619 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:09:42,620 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:09:42,623 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:09:42,624 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,627 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4fffcf38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42, skipping insertion in model container [2018-10-24 12:09:42,628 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,638 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:09:42,662 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:09:42,854 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:09:42,858 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:09:42,875 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:09:42,892 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:09:42,892 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42 WrapperNode [2018-10-24 12:09:42,892 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:09:42,893 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:09:42,894 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:09:42,894 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:09:42,903 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,909 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,917 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:09:42,917 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:09:42,917 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:09:42,917 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:09:42,928 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,928 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,929 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,929 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,932 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,940 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,941 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... [2018-10-24 12:09:42,948 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:09:42,948 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:09:42,949 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:09:42,949 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:09:42,950 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:09:43,025 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:09:43,025 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:09:43,025 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:09:43,025 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:09:43,026 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:09:43,026 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:09:43,027 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:09:43,027 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:09:43,314 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:09:43,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:09:43 BoogieIcfgContainer [2018-10-24 12:09:43,315 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:09:43,316 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:09:43,316 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:09:43,319 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:09:43,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:09:42" (1/3) ... [2018-10-24 12:09:43,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fc45f53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:09:43, skipping insertion in model container [2018-10-24 12:09:43,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:42" (2/3) ... [2018-10-24 12:09:43,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fc45f53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:09:43, skipping insertion in model container [2018-10-24 12:09:43,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:09:43" (3/3) ... [2018-10-24 12:09:43,323 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_false-unreach-call1.i [2018-10-24 12:09:43,332 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:09:43,339 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:09:43,357 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:09:43,391 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:09:43,391 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:09:43,391 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:09:43,392 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:09:43,392 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:09:43,392 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:09:43,392 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:09:43,392 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:09:43,411 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-24 12:09:43,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:09:43,417 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:43,418 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:43,421 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:43,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:43,428 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-24 12:09:43,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:43,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:43,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:43,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:43,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:43,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:43,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:43,536 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:09:43,536 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:09:43,536 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:09:43,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:09:43,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:09:43,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:09:43,560 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-24 12:09:43,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:43,584 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-24 12:09:43,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:09:43,586 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:09:43,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:43,595 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:09:43,596 INFO L226 Difference]: Without dead ends: 13 [2018-10-24 12:09:43,599 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:09:43,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-24 12:09:43,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-24 12:09:43,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-24 12:09:43,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-24 12:09:43,638 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-24 12:09:43,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:43,638 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-24 12:09:43,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:09:43,638 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-24 12:09:43,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:09:43,639 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:43,639 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:43,640 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:43,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:43,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-24 12:09:43,641 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:43,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:43,642 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:43,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:43,642 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:43,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:43,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:43,803 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:09:43,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:09:43,804 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:09:43,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:09:43,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:09:43,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:09:43,806 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-24 12:09:43,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:43,892 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-24 12:09:43,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:09:43,893 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:09:43,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:43,894 INFO L225 Difference]: With dead ends: 24 [2018-10-24 12:09:43,894 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:09:43,895 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:09:43,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:09:43,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 12:09:43,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 12:09:43,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-24 12:09:43,900 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-24 12:09:43,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:43,901 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-24 12:09:43,901 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:09:43,901 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-24 12:09:43,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:09:43,902 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:43,902 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:43,903 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:43,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:43,904 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-24 12:09:43,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:43,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:43,905 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:43,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:43,905 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:43,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:44,048 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:44,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:44,049 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:44,049 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-24 12:09:44,051 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:09:44,100 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:09:44,100 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:09:44,209 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:09:44,648 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:09:44,651 INFO L272 AbstractInterpreter]: Visited 13 different actions 93 times. Merged at 4 different actions 42 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-24 12:09:44,664 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:44,666 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:09:44,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:44,666 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:44,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:44,676 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:44,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:44,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:44,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:44,767 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:44,829 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:44,853 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:44,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:09:44,854 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:44,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:09:44,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:09:44,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:09:44,855 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-10-24 12:09:44,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:44,960 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-10-24 12:09:44,961 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:09:44,961 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-24 12:09:44,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:44,962 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:09:44,962 INFO L226 Difference]: Without dead ends: 19 [2018-10-24 12:09:44,963 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 [2018-10-24 12:09:44,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-24 12:09:44,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-24 12:09:44,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-24 12:09:44,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-24 12:09:44,968 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-24 12:09:44,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:44,968 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-24 12:09:44,968 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:09:44,969 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-24 12:09:44,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:09:44,969 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:44,970 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:44,970 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:44,970 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:44,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-24 12:09:44,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:44,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:44,972 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:44,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:44,972 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:44,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:45,155 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:45,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:45,156 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:45,156 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:45,156 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:45,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:45,157 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:45,169 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:45,170 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:45,183 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:09:45,183 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:45,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:45,347 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-24 12:09:45,348 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:45,424 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-24 12:09:45,450 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:09:45,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 7 [2018-10-24 12:09:45,450 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:09:45,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:09:45,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:09:45,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:09:45,451 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 3 states. [2018-10-24 12:09:45,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:45,477 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-10-24 12:09:45,479 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:09:45,479 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-24 12:09:45,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:45,480 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:09:45,480 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 12:09:45,481 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 [2018-10-24 12:09:45,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 12:09:45,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-24 12:09:45,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:09:45,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-24 12:09:45,486 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2018-10-24 12:09:45,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:45,486 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-24 12:09:45,487 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:09:45,487 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-24 12:09:45,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:09:45,487 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:45,488 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:45,488 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:45,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:45,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1801011421, now seen corresponding path program 1 times [2018-10-24 12:09:45,489 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:45,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:45,490 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:45,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:45,490 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:45,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:45,692 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:45,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:45,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:45,695 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-10-24 12:09:45,695 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:09:45,697 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:09:45,697 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:09:45,703 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:09:45,992 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:09:45,992 INFO L272 AbstractInterpreter]: Visited 14 different actions 114 times. Merged at 5 different actions 46 times. Widened at 2 different actions 7 times. Found 12 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-24 12:09:45,999 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:46,000 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:09:46,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:46,000 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:46,009 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:46,009 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:46,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:46,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:46,095 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:46,095 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:46,409 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:46,433 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:46,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2018-10-24 12:09:46,433 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:46,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:09:46,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:09:46,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:09:46,436 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-10-24 12:09:46,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:46,495 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-24 12:09:46,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:09:46,495 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:09:46,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:46,497 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:09:46,497 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:09:46,498 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:09:46,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:09:46,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 12:09:46,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 12:09:46,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-24 12:09:46,504 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-10-24 12:09:46,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:46,504 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-24 12:09:46,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:09:46,505 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-24 12:09:46,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:09:46,506 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:46,506 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:46,506 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:46,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:46,507 INFO L82 PathProgramCache]: Analyzing trace with hash -2092450784, now seen corresponding path program 2 times [2018-10-24 12:09:46,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:46,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:46,508 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:46,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:46,508 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:46,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:46,672 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:46,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:46,673 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:46,673 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:46,673 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:46,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:46,674 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:46,685 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:46,685 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:46,739 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:09:46,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:46,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:47,141 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-24 12:09:47,142 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:47,258 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-24 12:09:47,279 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:47,280 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 11 [2018-10-24 12:09:47,280 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:47,280 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:09:47,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:09:47,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:09:47,281 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 9 states. [2018-10-24 12:09:47,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:47,456 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2018-10-24 12:09:47,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:09:47,457 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-24 12:09:47,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:47,458 INFO L225 Difference]: With dead ends: 44 [2018-10-24 12:09:47,459 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:09:47,459 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 [2018-10-24 12:09:47,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:09:47,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-10-24 12:09:47,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:09:47,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-24 12:09:47,465 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2018-10-24 12:09:47,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:47,466 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-24 12:09:47,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:09:47,466 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-24 12:09:47,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:09:47,467 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:47,468 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:47,468 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:47,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:47,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1050905282, now seen corresponding path program 3 times [2018-10-24 12:09:47,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:47,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:47,470 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:47,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:47,470 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:47,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:47,879 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:47,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:47,880 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:47,880 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:47,880 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:47,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:47,880 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:47,890 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:47,891 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:47,906 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:47,906 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:47,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:47,973 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:09:47,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:48,292 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:09:48,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:48,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 15 [2018-10-24 12:09:48,313 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:48,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:09:48,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:09:48,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:09:48,314 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2018-10-24 12:09:48,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:48,440 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-10-24 12:09:48,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:09:48,440 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-24 12:09:48,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:48,442 INFO L225 Difference]: With dead ends: 46 [2018-10-24 12:09:48,442 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:09:48,443 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:09:48,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:09:48,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-24 12:09:48,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:09:48,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-24 12:09:48,450 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2018-10-24 12:09:48,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:48,450 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-24 12:09:48,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:09:48,451 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-24 12:09:48,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:09:48,452 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:48,452 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:48,452 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:48,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:48,453 INFO L82 PathProgramCache]: Analyzing trace with hash -306121381, now seen corresponding path program 4 times [2018-10-24 12:09:48,453 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:48,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:48,454 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:48,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:48,454 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:48,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:48,717 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:48,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:48,718 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:48,718 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:48,718 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:48,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:48,718 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:48,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:48,730 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:48,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:48,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:48,797 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:09:48,797 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:49,045 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:09:49,066 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:49,067 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 17 [2018-10-24 12:09:49,067 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:49,067 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:09:49,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:09:49,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:09:49,069 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2018-10-24 12:09:49,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:49,240 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-10-24 12:09:49,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:09:49,242 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-24 12:09:49,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:49,245 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:09:49,245 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:09:49,246 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:09:49,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:09:49,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-24 12:09:49,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:09:49,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-10-24 12:09:49,252 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2018-10-24 12:09:49,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:49,252 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-10-24 12:09:49,252 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:09:49,252 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-10-24 12:09:49,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:09:49,253 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:49,254 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:49,254 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:49,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:49,254 INFO L82 PathProgramCache]: Analyzing trace with hash -249977826, now seen corresponding path program 5 times [2018-10-24 12:09:49,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:49,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:49,256 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:49,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:49,256 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:49,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:49,734 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:49,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:49,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:49,735 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:49,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:49,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:49,736 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:49,743 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:49,743 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:49,756 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:09:49,756 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:49,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:49,948 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:09:49,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:50,063 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:09:50,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:50,085 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 5] total 17 [2018-10-24 12:09:50,085 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:50,085 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:09:50,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:09:50,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=187, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:09:50,086 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2018-10-24 12:09:52,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:52,613 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-10-24 12:09:52,613 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:09:52,613 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2018-10-24 12:09:52,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:52,614 INFO L225 Difference]: With dead ends: 62 [2018-10-24 12:09:52,614 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:09:52,615 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:09:52,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:09:52,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2018-10-24 12:09:52,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 12:09:52,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2018-10-24 12:09:52,621 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2018-10-24 12:09:52,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:52,621 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2018-10-24 12:09:52,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:09:52,622 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2018-10-24 12:09:52,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:09:52,623 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:52,623 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:52,623 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:52,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:52,624 INFO L82 PathProgramCache]: Analyzing trace with hash 607533056, now seen corresponding path program 6 times [2018-10-24 12:09:52,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:52,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:52,625 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:52,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:52,625 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:52,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:52,845 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:52,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:52,846 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:52,846 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:52,846 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:52,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:52,847 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:52,856 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:52,856 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:52,871 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:52,871 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:52,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:52,935 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:52,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:53,613 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:53,633 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:53,634 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 24 [2018-10-24 12:09:53,634 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:53,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:09:53,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:09:53,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:09:53,635 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 13 states. [2018-10-24 12:09:53,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:53,834 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2018-10-24 12:09:53,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:09:53,834 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-24 12:09:53,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:53,838 INFO L225 Difference]: With dead ends: 61 [2018-10-24 12:09:53,838 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:09:53,839 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:09:53,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:09:53,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-10-24 12:09:53,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-24 12:09:53,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-10-24 12:09:53,846 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2018-10-24 12:09:53,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:53,847 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-10-24 12:09:53,847 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:09:53,847 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-10-24 12:09:53,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:09:53,848 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:53,848 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:53,848 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:53,849 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:53,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1655862429, now seen corresponding path program 7 times [2018-10-24 12:09:53,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:53,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:53,850 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:53,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:53,850 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:53,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:54,116 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:54,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:54,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:54,117 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:54,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:54,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:54,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:54,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:54,125 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:54,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:54,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:54,237 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:09:54,237 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:54,789 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:09:54,810 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:54,811 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12] total 24 [2018-10-24 12:09:54,811 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:54,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:09:54,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:09:54,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:09:54,812 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 14 states. [2018-10-24 12:09:55,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:55,191 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2018-10-24 12:09:55,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:09:55,197 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-24 12:09:55,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:55,198 INFO L225 Difference]: With dead ends: 64 [2018-10-24 12:09:55,198 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:09:55,199 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:09:55,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:09:55,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-24 12:09:55,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:09:55,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-10-24 12:09:55,206 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 44 [2018-10-24 12:09:55,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:55,207 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-10-24 12:09:55,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:09:55,207 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-10-24 12:09:55,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:09:55,210 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:55,210 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:55,211 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:55,211 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:55,211 INFO L82 PathProgramCache]: Analyzing trace with hash -565963040, now seen corresponding path program 8 times [2018-10-24 12:09:55,211 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:55,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:55,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:55,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:55,213 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:55,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:55,539 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:55,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:55,539 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:55,539 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:55,539 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:55,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:55,540 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:55,549 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:55,549 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:55,566 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:09:55,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:55,568 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:55,683 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 12:09:55,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:55,855 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 12:09:55,889 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:55,890 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6] total 23 [2018-10-24 12:09:55,890 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:55,890 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:09:55,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:09:55,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=359, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:09:55,891 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 19 states. [2018-10-24 12:09:59,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:59,772 INFO L93 Difference]: Finished difference Result 74 states and 85 transitions. [2018-10-24 12:09:59,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:09:59,773 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2018-10-24 12:09:59,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:59,774 INFO L225 Difference]: With dead ends: 74 [2018-10-24 12:09:59,774 INFO L226 Difference]: Without dead ends: 58 [2018-10-24 12:09:59,775 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=195, Invalid=455, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:09:59,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-24 12:09:59,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-10-24 12:09:59,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 12:09:59,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-10-24 12:09:59,782 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 47 [2018-10-24 12:09:59,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:59,782 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-10-24 12:09:59,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:09:59,783 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-10-24 12:09:59,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:09:59,783 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:59,784 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:59,784 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:59,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:59,784 INFO L82 PathProgramCache]: Analyzing trace with hash -829748866, now seen corresponding path program 9 times [2018-10-24 12:09:59,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:59,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:59,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:59,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:59,786 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:59,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:00,320 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:00,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:00,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:00,320 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:00,320 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:00,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:00,321 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:00,328 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:00,328 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:00,369 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:00,369 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:00,372 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:00,708 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:00,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:01,577 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:01,602 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:01,602 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 14] total 29 [2018-10-24 12:10:01,602 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:01,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:10:01,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:10:01,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:10:01,604 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 17 states. [2018-10-24 12:10:01,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:01,914 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2018-10-24 12:10:01,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:10:01,914 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-24 12:10:01,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:01,916 INFO L225 Difference]: With dead ends: 76 [2018-10-24 12:10:01,916 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:10:01,917 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 93 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:10:01,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:10:01,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-24 12:10:01,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-24 12:10:01,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2018-10-24 12:10:01,924 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 53 [2018-10-24 12:10:01,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:01,925 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2018-10-24 12:10:01,925 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:10:01,925 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2018-10-24 12:10:01,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:10:01,926 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:01,926 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:01,926 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:01,927 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:01,927 INFO L82 PathProgramCache]: Analyzing trace with hash 786973339, now seen corresponding path program 10 times [2018-10-24 12:10:01,927 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:01,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:01,928 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:01,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:01,928 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:01,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:02,310 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:02,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:02,310 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:02,310 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:02,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:02,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:02,311 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:02,320 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:02,320 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:02,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:02,350 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:02,417 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:02,417 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:03,300 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:03,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:03,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 15] total 31 [2018-10-24 12:10:03,320 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:03,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:10:03,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:10:03,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:10:03,322 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 18 states. [2018-10-24 12:10:03,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:03,704 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2018-10-24 12:10:03,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:10:03,705 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-24 12:10:03,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:03,706 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:10:03,706 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:10:03,707 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 98 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:10:03,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:10:03,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-24 12:10:03,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 12:10:03,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-10-24 12:10:03,717 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2018-10-24 12:10:03,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:03,718 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-10-24 12:10:03,718 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:10:03,718 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-10-24 12:10:03,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:10:03,719 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:03,719 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:03,720 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:03,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:03,720 INFO L82 PathProgramCache]: Analyzing trace with hash 794925150, now seen corresponding path program 11 times [2018-10-24 12:10:03,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:03,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:03,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:03,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:03,721 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:03,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:04,045 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:04,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:04,046 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:04,046 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:04,046 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:04,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:04,046 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:04,055 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:04,056 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:04,076 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:10:04,076 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:04,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:04,239 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-24 12:10:04,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:04,413 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-24 12:10:04,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:04,434 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 7, 7] total 29 [2018-10-24 12:10:04,434 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:04,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:10:04,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:10:04,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=587, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:10:04,436 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 24 states. [2018-10-24 12:10:18,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:18,206 INFO L93 Difference]: Finished difference Result 89 states and 102 transitions. [2018-10-24 12:10:18,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:10:18,259 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-10-24 12:10:18,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:18,260 INFO L225 Difference]: With dead ends: 89 [2018-10-24 12:10:18,260 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:10:18,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=305, Invalid=751, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:10:18,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:10:18,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2018-10-24 12:10:18,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 12:10:18,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2018-10-24 12:10:18,270 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 59 [2018-10-24 12:10:18,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:18,271 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2018-10-24 12:10:18,271 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:10:18,271 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2018-10-24 12:10:18,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 12:10:18,272 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:18,273 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:18,273 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:18,273 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:18,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1319222592, now seen corresponding path program 12 times [2018-10-24 12:10:18,273 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:18,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:18,274 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:18,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:18,275 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:18,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:18,757 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:18,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:18,758 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:18,758 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:18,758 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:18,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:18,758 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:18,766 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:18,766 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:18,786 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:18,786 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:18,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:18,880 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:10:18,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:20,281 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:10:20,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:20,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 17] total 36 [2018-10-24 12:10:20,301 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:20,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:10:20,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:10:20,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:10:20,304 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 21 states. [2018-10-24 12:10:20,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:20,809 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2018-10-24 12:10:20,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:10:20,810 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-24 12:10:20,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:20,810 INFO L225 Difference]: With dead ends: 91 [2018-10-24 12:10:20,811 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:10:20,812 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 114 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:10:20,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:10:20,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-24 12:10:20,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-24 12:10:20,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2018-10-24 12:10:20,819 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 65 [2018-10-24 12:10:20,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:20,820 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2018-10-24 12:10:20,820 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:10:20,820 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2018-10-24 12:10:20,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-24 12:10:20,821 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:20,821 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:20,821 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:20,822 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:20,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1618626467, now seen corresponding path program 13 times [2018-10-24 12:10:20,822 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:20,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:20,823 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:20,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:20,823 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:20,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:21,263 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:21,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:21,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:21,264 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:21,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:21,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:21,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:21,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:21,272 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:21,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:21,302 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:21,342 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:10:21,343 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:22,628 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:10:22,648 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:22,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 18] total 38 [2018-10-24 12:10:22,649 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:22,649 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:10:22,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:10:22,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:10:22,650 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand 22 states. [2018-10-24 12:10:23,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:23,391 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2018-10-24 12:10:23,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:10:23,392 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-24 12:10:23,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:23,393 INFO L225 Difference]: With dead ends: 94 [2018-10-24 12:10:23,393 INFO L226 Difference]: Without dead ends: 72 [2018-10-24 12:10:23,394 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:10:23,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-24 12:10:23,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-24 12:10:23,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 12:10:23,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-10-24 12:10:23,402 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 68 [2018-10-24 12:10:23,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:23,402 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-10-24 12:10:23,403 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:10:23,403 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-10-24 12:10:23,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:10:23,404 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:23,404 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:23,404 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:23,404 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:23,405 INFO L82 PathProgramCache]: Analyzing trace with hash -512392800, now seen corresponding path program 14 times [2018-10-24 12:10:23,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:23,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:23,406 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:23,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:23,406 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:23,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:24,283 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:24,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:24,283 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:24,283 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:24,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:24,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:24,283 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:24,292 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:24,292 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:24,333 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:10:24,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:24,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:24,649 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-24 12:10:24,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:24,896 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-24 12:10:24,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:24,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 8, 8] total 35 [2018-10-24 12:10:24,916 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:24,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:10:24,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:10:24,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=871, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:10:24,918 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 29 states. [2018-10-24 12:10:28,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:28,017 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2018-10-24 12:10:28,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:10:28,018 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 71 [2018-10-24 12:10:28,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:28,018 INFO L225 Difference]: With dead ends: 104 [2018-10-24 12:10:28,019 INFO L226 Difference]: Without dead ends: 82 [2018-10-24 12:10:28,019 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=439, Invalid=1121, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:10:28,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-24 12:10:28,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2018-10-24 12:10:28,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 12:10:28,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2018-10-24 12:10:28,032 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 71 [2018-10-24 12:10:28,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:28,032 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2018-10-24 12:10:28,032 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:10:28,032 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2018-10-24 12:10:28,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-24 12:10:28,033 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:28,033 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:28,034 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:28,034 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:28,034 INFO L82 PathProgramCache]: Analyzing trace with hash 2099613118, now seen corresponding path program 15 times [2018-10-24 12:10:28,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:28,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:28,035 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:28,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:28,035 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:28,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:28,538 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:28,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:28,539 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:28,539 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:28,539 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:28,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:28,539 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:28,548 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:28,548 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:28,569 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:28,569 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:28,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:28,770 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:10:28,771 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:31,730 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:10:31,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:31,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 23] total 46 [2018-10-24 12:10:31,751 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:31,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:10:31,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:10:31,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:10:31,753 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 25 states. [2018-10-24 12:10:32,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:32,357 INFO L93 Difference]: Finished difference Result 109 states and 123 transitions. [2018-10-24 12:10:32,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:10:32,358 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-10-24 12:10:32,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:32,359 INFO L225 Difference]: With dead ends: 109 [2018-10-24 12:10:32,359 INFO L226 Difference]: Without dead ends: 84 [2018-10-24 12:10:32,361 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:10:32,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-24 12:10:32,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-10-24 12:10:32,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-24 12:10:32,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2018-10-24 12:10:32,369 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 77 [2018-10-24 12:10:32,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:32,369 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2018-10-24 12:10:32,369 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:10:32,369 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2018-10-24 12:10:32,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-24 12:10:32,370 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:32,370 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:32,371 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:32,371 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:32,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1326089058, now seen corresponding path program 16 times [2018-10-24 12:10:32,371 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:32,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:32,372 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:32,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:32,372 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:32,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:33,235 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:33,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:33,236 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:33,236 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:33,236 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:33,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:33,236 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:33,244 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:33,244 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:33,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:33,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:33,315 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:10:33,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:35,503 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:10:35,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:35,524 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21, 22] total 47 [2018-10-24 12:10:35,524 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:35,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:10:35,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:10:35,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=1546, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:10:35,525 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 27 states. [2018-10-24 12:10:36,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:36,354 INFO L93 Difference]: Finished difference Result 115 states and 129 transitions. [2018-10-24 12:10:36,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:10:36,355 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-24 12:10:36,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:36,356 INFO L225 Difference]: With dead ends: 115 [2018-10-24 12:10:36,356 INFO L226 Difference]: Without dead ends: 90 [2018-10-24 12:10:36,357 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 [2018-10-24 12:10:36,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-24 12:10:36,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-10-24 12:10:36,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-24 12:10:36,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2018-10-24 12:10:36,365 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 83 [2018-10-24 12:10:36,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:36,365 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2018-10-24 12:10:36,365 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:10:36,365 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2018-10-24 12:10:36,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:10:36,366 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:36,366 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:36,367 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:36,367 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:36,367 INFO L82 PathProgramCache]: Analyzing trace with hash -502348930, now seen corresponding path program 17 times [2018-10-24 12:10:36,367 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:36,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:36,368 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:36,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:36,368 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:36,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:37,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 52 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:37,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:37,599 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:37,599 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:37,599 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:37,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:37,599 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:37,609 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:37,609 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:37,674 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:10:37,674 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:37,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:38,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-24 12:10:38,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:38,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-24 12:10:38,968 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:38,968 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 9, 9] total 43 [2018-10-24 12:10:38,968 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:38,969 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:10:38,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:10:38,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:10:38,970 INFO L87 Difference]: Start difference. First operand 90 states and 96 transitions. Second operand 36 states. [2018-10-24 12:10:46,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:46,939 INFO L93 Difference]: Finished difference Result 128 states and 146 transitions. [2018-10-24 12:10:46,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:10:46,940 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 89 [2018-10-24 12:10:46,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:46,941 INFO L225 Difference]: With dead ends: 128 [2018-10-24 12:10:46,941 INFO L226 Difference]: Without dead ends: 103 [2018-10-24 12:10:46,942 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 170 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=690, Invalid=1760, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:10:46,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-24 12:10:46,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2018-10-24 12:10:46,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-24 12:10:46,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2018-10-24 12:10:46,951 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 89 [2018-10-24 12:10:46,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:46,951 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2018-10-24 12:10:46,951 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:10:46,951 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2018-10-24 12:10:46,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-24 12:10:46,952 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:46,952 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:46,952 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:46,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:46,953 INFO L82 PathProgramCache]: Analyzing trace with hash -2002812611, now seen corresponding path program 18 times [2018-10-24 12:10:46,953 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:46,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:46,954 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:46,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:46,954 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:46,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:48,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 140 proven. 1134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:10:48,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:48,101 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:48,101 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:48,101 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:48,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:48,101 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:48,111 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:48,111 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:48,136 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:48,137 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:48,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:48,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:10:48,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:51,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:10:51,075 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:51,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 25, 26] total 55 [2018-10-24 12:10:51,076 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:51,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:10:51,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:10:51,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:10:51,077 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand 31 states. [2018-10-24 12:10:52,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:52,182 INFO L93 Difference]: Finished difference Result 133 states and 149 transitions. [2018-10-24 12:10:52,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:10:52,186 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 98 [2018-10-24 12:10:52,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:52,187 INFO L225 Difference]: With dead ends: 133 [2018-10-24 12:10:52,187 INFO L226 Difference]: Without dead ends: 105 [2018-10-24 12:10:52,189 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:10:52,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-24 12:10:52,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2018-10-24 12:10:52,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-24 12:10:52,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2018-10-24 12:10:52,199 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 98 [2018-10-24 12:10:52,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:52,199 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2018-10-24 12:10:52,200 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:10:52,200 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2018-10-24 12:10:52,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-24 12:10:52,200 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:52,201 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:52,201 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:52,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:52,201 INFO L82 PathProgramCache]: Analyzing trace with hash 615751261, now seen corresponding path program 19 times [2018-10-24 12:10:52,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:52,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:52,202 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:52,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:52,202 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:52,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:52,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 150 proven. 1305 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:10:52,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:52,860 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:52,860 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:52,861 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:52,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:52,861 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 [2018-10-24 12:10:52,868 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:52,868 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:52,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:52,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:52,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:10:52,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:58,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:10:58,345 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:58,345 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 27, 28] total 59 [2018-10-24 12:10:58,345 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:58,345 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:10:58,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:10:58,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=2469, Unknown=1, NotChecked=0, Total=3422 [2018-10-24 12:10:58,347 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand 33 states. [2018-10-24 12:10:59,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:59,434 INFO L93 Difference]: Finished difference Result 139 states and 155 transitions. [2018-10-24 12:10:59,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:10:59,434 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 104 [2018-10-24 12:10:59,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:59,435 INFO L225 Difference]: With dead ends: 139 [2018-10-24 12:10:59,435 INFO L226 Difference]: Without dead ends: 111 [2018-10-24 12:10:59,438 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 181 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=952, Invalid=2469, Unknown=1, NotChecked=0, Total=3422 [2018-10-24 12:10:59,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-24 12:10:59,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2018-10-24 12:10:59,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-24 12:10:59,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 118 transitions. [2018-10-24 12:10:59,448 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 118 transitions. Word has length 104 [2018-10-24 12:10:59,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:59,449 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 118 transitions. [2018-10-24 12:10:59,449 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:10:59,449 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 118 transitions. [2018-10-24 12:10:59,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-24 12:10:59,450 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:59,450 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:59,450 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:59,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:59,450 INFO L82 PathProgramCache]: Analyzing trace with hash 323314557, now seen corresponding path program 20 times [2018-10-24 12:10:59,451 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:59,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:59,451 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:59,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:59,452 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:59,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:00,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 160 proven. 1488 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:11:00,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:00,951 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:00,951 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:00,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:00,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:00,951 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 [2018-10-24 12:11:00,958 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:00,958 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:27,067 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:11:27,067 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:27,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:27,952 WARN L179 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:11:28,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-24 12:11:28,412 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:29,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-24 12:11:29,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:29,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 10, 11] total 52 [2018-10-24 12:11:29,098 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:29,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:11:29,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:11:29,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=2089, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:11:29,100 INFO L87 Difference]: Start difference. First operand 111 states and 118 transitions. Second operand 43 states. [2018-10-24 12:11:33,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:33,511 INFO L93 Difference]: Finished difference Result 152 states and 172 transitions. [2018-10-24 12:11:33,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:11:33,512 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 110 [2018-10-24 12:11:33,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:33,513 INFO L225 Difference]: With dead ends: 152 [2018-10-24 12:11:33,513 INFO L226 Difference]: Without dead ends: 124 [2018-10-24 12:11:33,515 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 209 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=727, Invalid=2813, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:11:33,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-24 12:11:33,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 121. [2018-10-24 12:11:33,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-10-24 12:11:33,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2018-10-24 12:11:33,525 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 110 [2018-10-24 12:11:33,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:33,525 INFO L481 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2018-10-24 12:11:33,525 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:11:33,525 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2018-10-24 12:11:33,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:11:33,526 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:33,526 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:33,526 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:33,526 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:33,526 INFO L82 PathProgramCache]: Analyzing trace with hash -1376389474, now seen corresponding path program 21 times [2018-10-24 12:11:33,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:33,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:33,527 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:33,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:33,527 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:33,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:35,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:35,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:35,717 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:35,717 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:35,717 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:35,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:35,718 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 [2018-10-24 12:11:35,725 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:35,725 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:35,768 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:35,768 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:35,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:35,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 1218 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:11:35,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:40,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 1218 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:11:40,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:40,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 31, 32] total 69 [2018-10-24 12:11:40,574 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:40,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:11:40,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:11:40,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1246, Invalid=3446, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:11:40,576 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand 39 states. [2018-10-24 12:11:42,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:42,022 INFO L93 Difference]: Finished difference Result 156 states and 161 transitions. [2018-10-24 12:11:42,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:11:42,023 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-10-24 12:11:42,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:42,024 INFO L225 Difference]: With dead ends: 156 [2018-10-24 12:11:42,024 INFO L226 Difference]: Without dead ends: 124 [2018-10-24 12:11:42,026 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=1246, Invalid=3446, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:11:42,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-24 12:11:42,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-10-24 12:11:42,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-10-24 12:11:42,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2018-10-24 12:11:42,035 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 119 [2018-10-24 12:11:42,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:42,036 INFO L481 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2018-10-24 12:11:42,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:11:42,036 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2018-10-24 12:11:42,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-24 12:11:42,037 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:42,037 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:42,037 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:42,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:42,037 INFO L82 PathProgramCache]: Analyzing trace with hash -57936773, now seen corresponding path program 22 times [2018-10-24 12:11:42,038 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:42,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:42,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:42,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:42,039 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:42,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:43,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:43,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:43,102 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:43,102 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:43,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:43,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:43,102 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 [2018-10-24 12:11:43,112 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:43,112 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:43,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:43,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:43,216 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 690 proven. 1305 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:11:43,216 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:50,403 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 690 proven. 1305 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:11:50,423 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:50,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 32, 33] total 71 [2018-10-24 12:11:50,424 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:50,424 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:11:50,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:11:50,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1318, Invalid=3651, Unknown=1, NotChecked=0, Total=4970 [2018-10-24 12:11:50,427 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand 40 states. [2018-10-24 12:11:51,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:51,978 INFO L93 Difference]: Finished difference Result 159 states and 164 transitions. [2018-10-24 12:11:51,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:11:51,978 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-10-24 12:11:51,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:51,980 INFO L225 Difference]: With dead ends: 159 [2018-10-24 12:11:51,980 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:11:51,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 212 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=1318, Invalid=3651, Unknown=1, NotChecked=0, Total=4970 [2018-10-24 12:11:51,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:11:51,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-10-24 12:11:51,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-10-24 12:11:51,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2018-10-24 12:11:51,992 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 122 [2018-10-24 12:11:51,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:51,993 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2018-10-24 12:11:51,993 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:11:51,993 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2018-10-24 12:11:52,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-24 12:11:52,004 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:52,004 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 30, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:52,004 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:52,006 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:52,006 INFO L82 PathProgramCache]: Analyzing trace with hash 490556798, now seen corresponding path program 23 times [2018-10-24 12:11:52,006 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:52,006 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:52,007 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:52,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:52,007 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:52,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:53,066 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:53,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:53,066 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:53,066 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:53,066 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:53,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:53,067 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 [2018-10-24 12:11:53,074 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:53,074 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:13:18,334 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 12:13:18,334 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:18,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:19,862 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 841 proven. 126 refuted. 0 times theorem prover too weak. 1218 trivial. 0 not checked. [2018-10-24 12:13:19,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:20,695 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 841 proven. 126 refuted. 0 times theorem prover too weak. 1218 trivial. 0 not checked. [2018-10-24 12:13:20,698 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:20,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 12, 12] total 61 [2018-10-24 12:13:20,699 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:20,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:13:20,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:13:20,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=908, Invalid=2752, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:13:20,700 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand 51 states. [2018-10-24 12:13:24,038 WARN L179 SmtUtils]: Spent 451.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2018-10-24 12:13:26,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:26,689 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2018-10-24 12:13:26,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:13:26,689 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 125 [2018-10-24 12:13:26,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:26,690 INFO L225 Difference]: With dead ends: 171 [2018-10-24 12:13:26,690 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:13:26,691 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 238 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=1297, Invalid=3533, Unknown=0, NotChecked=0, Total=4830 [2018-10-24 12:13:26,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:13:26,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 132. [2018-10-24 12:13:26,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-24 12:13:26,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 134 transitions. [2018-10-24 12:13:26,705 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 134 transitions. Word has length 125 [2018-10-24 12:13:26,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:26,705 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 134 transitions. [2018-10-24 12:13:26,705 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:13:26,705 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 134 transitions. [2018-10-24 12:13:26,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-24 12:13:26,706 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:26,706 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:26,706 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:26,707 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:26,707 INFO L82 PathProgramCache]: Analyzing trace with hash -2039378720, now seen corresponding path program 24 times [2018-10-24 12:13:26,707 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:26,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:26,708 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:26,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:26,708 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:26,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:27,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:27,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:27,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:27,738 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:27,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:27,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:27,738 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 [2018-10-24 12:13:27,746 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:13:27,746 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:13:27,782 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:13:27,782 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:27,785 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:27,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 832 proven. 1488 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-24 12:13:27,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:33,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 832 proven. 1488 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-24 12:13:33,218 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:33,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 34, 35] total 76 [2018-10-24 12:13:33,219 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:33,219 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:13:33,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:13:33,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1503, Invalid=4197, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:13:33,220 INFO L87 Difference]: Start difference. First operand 132 states and 134 transitions. Second operand 43 states. [2018-10-24 12:13:35,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:35,015 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2018-10-24 12:13:35,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:13:35,015 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-10-24 12:13:35,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:35,017 INFO L225 Difference]: With dead ends: 169 [2018-10-24 12:13:35,017 INFO L226 Difference]: Without dead ends: 135 [2018-10-24 12:13:35,018 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 228 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=1503, Invalid=4197, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:13:35,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-24 12:13:35,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2018-10-24 12:13:35,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-24 12:13:35,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2018-10-24 12:13:35,032 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2018-10-24 12:13:35,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:35,032 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2018-10-24 12:13:35,032 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:13:35,033 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2018-10-24 12:13:35,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-24 12:13:35,033 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:35,034 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:35,034 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:35,034 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:35,034 INFO L82 PathProgramCache]: Analyzing trace with hash 34645821, now seen corresponding path program 25 times [2018-10-24 12:13:35,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:35,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:35,035 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:35,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:35,035 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:35,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:36,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:36,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:36,282 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:36,282 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:36,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:36,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:36,283 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 [2018-10-24 12:13:36,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:36,291 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:13:36,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:36,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:36,404 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 858 proven. 1584 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-24 12:13:36,404 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:41,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 858 proven. 1584 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-24 12:13:41,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:41,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 35, 36] total 78 [2018-10-24 12:13:41,925 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:41,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:13:41,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:13:41,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1582, Invalid=4424, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:13:41,927 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand 44 states. [2018-10-24 12:13:43,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:43,878 INFO L93 Difference]: Finished difference Result 172 states and 177 transitions. [2018-10-24 12:13:43,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:13:43,878 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-10-24 12:13:43,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:43,880 INFO L225 Difference]: With dead ends: 172 [2018-10-24 12:13:43,880 INFO L226 Difference]: Without dead ends: 138 [2018-10-24 12:13:43,881 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=1582, Invalid=4424, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:13:43,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-10-24 12:13:43,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2018-10-24 12:13:43,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-24 12:13:43,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 140 transitions. [2018-10-24 12:13:43,893 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 140 transitions. Word has length 134 [2018-10-24 12:13:43,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:43,893 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 140 transitions. [2018-10-24 12:13:43,894 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:13:43,894 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 140 transitions. [2018-10-24 12:13:43,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-24 12:13:43,894 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:43,895 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:43,895 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:43,895 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:43,895 INFO L82 PathProgramCache]: Analyzing trace with hash -99773504, now seen corresponding path program 26 times [2018-10-24 12:13:43,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:43,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:43,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:43,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:43,896 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:43,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:45,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:45,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:45,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:45,092 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:45,093 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:45,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:45,093 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 [2018-10-24 12:13:45,100 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:13:45,100 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