java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:34:45,827 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:34:45,833 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:34:45,845 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:34:45,845 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:34:45,846 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:34:45,848 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:34:45,849 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:34:45,851 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:34:45,852 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:34:45,853 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:34:45,853 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:34:45,854 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:34:45,855 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:34:45,856 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:34:45,857 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:34:45,858 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:34:45,860 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:34:45,862 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:34:45,863 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:34:45,865 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:34:45,869 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:34:45,872 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 12:34:45,892 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:34:45,918 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:34:45,918 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:34:45,919 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:34:45,919 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:34:45,920 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:34:45,920 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:34:45,920 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:34:45,920 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:34:45,920 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:34:45,921 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:34:45,921 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:34:45,921 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:34:45,921 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:34:45,921 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:34:45,922 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:34:45,922 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:34:45,922 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:34:45,923 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:34:45,923 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:34:45,923 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:34:45,923 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:34:45,923 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:34:45,924 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:34:45,924 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:34:45,924 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:34:45,924 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:34:45,924 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:34:45,925 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:34:45,925 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:34:45,925 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:34:45,925 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:34:45,925 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:34:45,926 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:34:45,926 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:34:45,926 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:34:45,926 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:34:45,988 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:34:46,001 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:34:46,007 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:34:46,009 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:34:46,009 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:34:46,010 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i [2018-10-24 12:34:46,072 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/17b69f391/24013ddb7d2c4d6ba61eb413e9e79ba5/FLAG1adf9ecee [2018-10-24 12:34:46,553 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:34:46,554 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i [2018-10-24 12:34:46,560 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/17b69f391/24013ddb7d2c4d6ba61eb413e9e79ba5/FLAG1adf9ecee [2018-10-24 12:34:46,576 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/17b69f391/24013ddb7d2c4d6ba61eb413e9e79ba5 [2018-10-24 12:34:46,589 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:34:46,590 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:34:46,591 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:34:46,591 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:34:46,594 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:34:46,595 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,598 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73816982 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46, skipping insertion in model container [2018-10-24 12:34:46,598 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,607 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:34:46,625 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:34:46,848 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:46,853 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:34:46,874 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:46,893 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:34:46,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46 WrapperNode [2018-10-24 12:34:46,894 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:34:46,896 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:46,896 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:34:46,896 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:34:46,906 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,913 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,920 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:46,920 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:34:46,921 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:34:46,921 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:34:46,936 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,936 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,937 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,937 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,941 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,949 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,953 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (1/1) ... [2018-10-24 12:34:46,955 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:34:46,960 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:34:46,960 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:34:46,960 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:34:46,961 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (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 12:34:47,031 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:34:47,031 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:34:47,032 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:34:47,032 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:34:47,032 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:34:47,032 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:34:47,033 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:34:47,033 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:34:47,387 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:34:47,387 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:47 BoogieIcfgContainer [2018-10-24 12:34:47,387 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:34:47,388 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:34:47,388 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:34:47,392 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:34:47,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:34:46" (1/3) ... [2018-10-24 12:34:47,393 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d479c97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:47, skipping insertion in model container [2018-10-24 12:34:47,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:46" (2/3) ... [2018-10-24 12:34:47,393 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d479c97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:47, skipping insertion in model container [2018-10-24 12:34:47,394 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:47" (3/3) ... [2018-10-24 12:34:47,395 INFO L112 eAbstractionObserver]: Analyzing ICFG string_concat-noarr_true-unreach-call_true-termination.i [2018-10-24 12:34:47,405 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:34:47,412 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:34:47,429 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:34:47,463 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:34:47,463 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:34:47,464 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:34:47,464 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:34:47,464 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:34:47,464 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:34:47,464 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:34:47,465 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:34:47,484 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-10-24 12:34:47,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:34:47,491 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:47,492 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:47,494 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:47,500 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:47,501 INFO L82 PathProgramCache]: Analyzing trace with hash -745796184, now seen corresponding path program 1 times [2018-10-24 12:34:47,504 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:47,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,555 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:47,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,555 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:47,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:47,624 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 12:34:47,626 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:47,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:34:47,627 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:47,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:34:47,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:34:47,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:34:47,645 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-10-24 12:34:47,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:47,668 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2018-10-24 12:34:47,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:34:47,669 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-10-24 12:34:47,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:47,678 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:34:47,678 INFO L226 Difference]: Without dead ends: 19 [2018-10-24 12:34:47,682 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 12:34:47,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-24 12:34:47,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-24 12:34:47,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-24 12:34:47,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-24 12:34:47,718 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-24 12:34:47,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:47,719 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-24 12:34:47,719 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:34:47,719 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-24 12:34:47,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-24 12:34:47,720 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:47,720 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:47,721 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:47,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:47,722 INFO L82 PathProgramCache]: Analyzing trace with hash 800081396, now seen corresponding path program 1 times [2018-10-24 12:34:47,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:47,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,723 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:47,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,724 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:47,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:47,941 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 12:34:47,941 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:47,942 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:34:47,942 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:47,944 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:34:47,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:34:47,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:34:47,945 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-10-24 12:34:48,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:48,086 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-10-24 12:34:48,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:34:48,087 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-10-24 12:34:48,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:48,088 INFO L225 Difference]: With dead ends: 32 [2018-10-24 12:34:48,088 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 12:34:48,090 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:34:48,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 12:34:48,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 12:34:48,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:34:48,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-24 12:34:48,096 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2018-10-24 12:34:48,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:48,096 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-24 12:34:48,096 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:34:48,096 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-24 12:34:48,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 12:34:48,097 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:48,097 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:48,098 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:48,098 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:48,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1097925811, now seen corresponding path program 1 times [2018-10-24 12:34:48,099 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:48,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:48,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:48,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:48,100 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:48,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:48,210 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-24 12:34:48,210 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:48,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:34:48,211 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:48,211 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:34:48,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:34:48,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:34:48,212 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-24 12:34:48,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:48,423 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-10-24 12:34:48,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:34:48,425 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2018-10-24 12:34:48,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:48,426 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:34:48,427 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 12:34:48,429 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:34:48,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 12:34:48,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 22. [2018-10-24 12:34:48,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-24 12:34:48,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-10-24 12:34:48,441 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 21 [2018-10-24 12:34:48,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:48,441 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-10-24 12:34:48,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:34:48,441 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-10-24 12:34:48,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 12:34:48,442 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:48,442 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:48,444 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:48,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:48,444 INFO L82 PathProgramCache]: Analyzing trace with hash -278190259, now seen corresponding path program 1 times [2018-10-24 12:34:48,445 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:48,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:48,446 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:48,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:48,446 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:48,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:48,605 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:48,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:48,606 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:48,607 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-10-24 12:34:48,609 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [10], [12], [15], [26], [30], [32], [35], [37], [45], [49], [52], [54], [60], [61], [62], [64] [2018-10-24 12:34:48,644 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:34:48,645 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:34:48,825 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:34:48,827 INFO L272 AbstractInterpreter]: Visited 19 different actions 37 times. Merged at 5 different actions 10 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 6 variables. [2018-10-24 12:34:48,836 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:48,837 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:34:48,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:48,838 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 12:34:48,849 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:48,849 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:48,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:48,884 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:48,983 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:48,983 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:49,090 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:49,113 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:49,113 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2018-10-24 12:34:49,113 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:49,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:34:49,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:34:49,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:34:49,115 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 8 states. [2018-10-24 12:34:49,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:49,277 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2018-10-24 12:34:49,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:34:49,278 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-24 12:34:49,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:49,280 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:34:49,280 INFO L226 Difference]: Without dead ends: 53 [2018-10-24 12:34:49,281 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:34:49,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-24 12:34:49,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2018-10-24 12:34:49,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:34:49,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-10-24 12:34:49,288 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 21 [2018-10-24 12:34:49,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:49,289 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-10-24 12:34:49,289 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:34:49,289 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-10-24 12:34:49,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-24 12:34:49,290 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:49,290 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:49,290 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:49,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:49,291 INFO L82 PathProgramCache]: Analyzing trace with hash -2006845708, now seen corresponding path program 1 times [2018-10-24 12:34:49,291 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:49,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:49,292 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:49,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:49,293 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:49,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:49,504 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:49,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:49,505 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:49,505 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 31 with the following transitions: [2018-10-24 12:34:49,506 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [10], [12], [15], [17], [26], [30], [32], [35], [37], [45], [49], [52], [54], [60], [61], [62], [64] [2018-10-24 12:34:49,508 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:34:49,508 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:34:49,663 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:34:49,663 INFO L272 AbstractInterpreter]: Visited 20 different actions 68 times. Merged at 10 different actions 30 times. Widened at 1 different actions 2 times. Found 4 fixpoints after 3 different actions. Largest state had 7 variables. [2018-10-24 12:34:49,673 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:49,674 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:34:49,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:49,674 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 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 12:34:49,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:49,684 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:49,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:49,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:49,782 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:49,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:50,347 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:50,368 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:50,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:34:50,368 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:50,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:34:50,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:34:50,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:34:50,370 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 9 states. [2018-10-24 12:34:50,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:50,487 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2018-10-24 12:34:50,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:34:50,487 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2018-10-24 12:34:50,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:50,491 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:34:50,491 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:34:50,492 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:34:50,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:34:50,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 46. [2018-10-24 12:34:50,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-24 12:34:50,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2018-10-24 12:34:50,500 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 30 [2018-10-24 12:34:50,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:50,500 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2018-10-24 12:34:50,500 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:34:50,501 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2018-10-24 12:34:50,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 12:34:50,502 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:50,502 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:50,502 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:50,502 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:50,503 INFO L82 PathProgramCache]: Analyzing trace with hash 750227251, now seen corresponding path program 2 times [2018-10-24 12:34:50,503 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:50,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:50,504 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:50,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:50,504 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:50,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:50,639 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:50,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:50,640 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:50,640 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:50,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:50,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:50,641 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) [2018-10-24 12:34:50,657 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:50,657 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:50,705 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:34:50,706 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:50,708 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:50,831 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-24 12:34:50,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:51,018 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-24 12:34:51,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:51,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 18 [2018-10-24 12:34:51,040 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:51,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:34:51,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:34:51,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:34:51,042 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 13 states. [2018-10-24 12:34:51,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:51,344 INFO L93 Difference]: Finished difference Result 112 states and 125 transitions. [2018-10-24 12:34:51,345 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:34:51,345 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-10-24 12:34:51,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:51,347 INFO L225 Difference]: With dead ends: 112 [2018-10-24 12:34:51,347 INFO L226 Difference]: Without dead ends: 100 [2018-10-24 12:34:51,348 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:34:51,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-24 12:34:51,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2018-10-24 12:34:51,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-24 12:34:51,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2018-10-24 12:34:51,356 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 33 [2018-10-24 12:34:51,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:51,356 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2018-10-24 12:34:51,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:34:51,356 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2018-10-24 12:34:51,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:34:51,358 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:51,358 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:51,358 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:51,358 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:51,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1707835635, now seen corresponding path program 3 times [2018-10-24 12:34:51,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:51,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:51,360 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:51,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:51,360 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:51,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:51,742 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:51,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:51,743 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:51,743 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:51,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:51,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:51,743 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 12:34:51,750 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:51,751 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:51,769 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:51,770 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:51,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:51,802 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:51,803 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:52,137 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:52,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:52,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:34:52,158 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:52,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:34:52,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:34:52,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:52,160 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand 14 states. [2018-10-24 12:34:52,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:52,335 INFO L93 Difference]: Finished difference Result 122 states and 133 transitions. [2018-10-24 12:34:52,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:34:52,336 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 45 [2018-10-24 12:34:52,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:52,338 INFO L225 Difference]: With dead ends: 122 [2018-10-24 12:34:52,338 INFO L226 Difference]: Without dead ends: 116 [2018-10-24 12:34:52,339 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:34:52,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2018-10-24 12:34:52,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 77. [2018-10-24 12:34:52,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-24 12:34:52,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2018-10-24 12:34:52,348 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 45 [2018-10-24 12:34:52,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:52,349 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2018-10-24 12:34:52,349 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:34:52,349 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2018-10-24 12:34:52,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-10-24 12:34:52,351 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:52,351 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:52,351 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:52,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:52,352 INFO L82 PathProgramCache]: Analyzing trace with hash 1071743214, now seen corresponding path program 4 times [2018-10-24 12:34:52,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:52,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:52,353 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:52,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:52,353 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:52,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:52,611 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:52,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:52,612 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:52,612 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:52,612 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:52,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:52,612 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 12:34:52,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:52,623 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:52,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:52,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:52,680 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:52,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:53,031 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:53,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:53,052 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:34:53,052 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:53,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:34:53,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:34:53,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=470, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:34:53,055 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand 15 states. [2018-10-24 12:34:53,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:53,318 INFO L93 Difference]: Finished difference Result 129 states and 141 transitions. [2018-10-24 12:34:53,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:34:53,322 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2018-10-24 12:34:53,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:53,324 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:34:53,324 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:34:53,325 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:34:53,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:34:53,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 84. [2018-10-24 12:34:53,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-24 12:34:53,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 93 transitions. [2018-10-24 12:34:53,333 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 93 transitions. Word has length 48 [2018-10-24 12:34:53,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:53,334 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 93 transitions. [2018-10-24 12:34:53,334 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:34:53,334 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 93 transitions. [2018-10-24 12:34:53,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-24 12:34:53,335 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:53,335 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:53,336 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:53,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:53,336 INFO L82 PathProgramCache]: Analyzing trace with hash 535766893, now seen corresponding path program 5 times [2018-10-24 12:34:53,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:53,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:53,337 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:53,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:53,338 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:53,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:53,647 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:53,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:53,648 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:53,648 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:53,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:53,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:53,648 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 12:34:53,658 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:53,658 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:53,674 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:34:53,675 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:53,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:53,832 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 12:34:53,833 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:53,936 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 12:34:53,958 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:53,958 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 8, 8] total 26 [2018-10-24 12:34:53,958 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:53,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:34:53,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:34:53,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:53,960 INFO L87 Difference]: Start difference. First operand 84 states and 93 transitions. Second operand 20 states. [2018-10-24 12:34:54,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:54,288 INFO L93 Difference]: Finished difference Result 181 states and 202 transitions. [2018-10-24 12:34:54,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:34:54,289 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 51 [2018-10-24 12:34:54,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:54,291 INFO L225 Difference]: With dead ends: 181 [2018-10-24 12:34:54,291 INFO L226 Difference]: Without dead ends: 167 [2018-10-24 12:34:54,292 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:34:54,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-24 12:34:54,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 115. [2018-10-24 12:34:54,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:34:54,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 128 transitions. [2018-10-24 12:34:54,301 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 128 transitions. Word has length 51 [2018-10-24 12:34:54,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:54,301 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 128 transitions. [2018-10-24 12:34:54,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:34:54,302 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 128 transitions. [2018-10-24 12:34:54,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-24 12:34:54,304 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:54,304 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:54,304 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:54,304 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:54,305 INFO L82 PathProgramCache]: Analyzing trace with hash 227276404, now seen corresponding path program 6 times [2018-10-24 12:34:54,305 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:54,306 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:54,306 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:54,306 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:54,306 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:54,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:54,596 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:54,597 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:54,597 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:54,597 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:54,597 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:54,597 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:54,597 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 12:34:54,606 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:54,606 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:54,660 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:54,660 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:54,664 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:54,911 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:54,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:55,640 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:55,661 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:55,662 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-24 12:34:55,662 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:55,662 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:34:55,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:34:55,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=920, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:34:55,664 INFO L87 Difference]: Start difference. First operand 115 states and 128 transitions. Second operand 21 states. [2018-10-24 12:34:55,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:55,850 INFO L93 Difference]: Finished difference Result 186 states and 204 transitions. [2018-10-24 12:34:55,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:34:55,850 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 66 [2018-10-24 12:34:55,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:55,852 INFO L225 Difference]: With dead ends: 186 [2018-10-24 12:34:55,852 INFO L226 Difference]: Without dead ends: 180 [2018-10-24 12:34:55,854 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 113 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=646, Invalid=994, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:34:55,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-10-24 12:34:55,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 122. [2018-10-24 12:34:55,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-24 12:34:55,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 136 transitions. [2018-10-24 12:34:55,864 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 136 transitions. Word has length 66 [2018-10-24 12:34:55,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:55,865 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 136 transitions. [2018-10-24 12:34:55,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:34:55,865 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 136 transitions. [2018-10-24 12:34:55,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:34:55,867 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:55,867 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:55,867 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:55,867 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:55,868 INFO L82 PathProgramCache]: Analyzing trace with hash 1732418355, now seen corresponding path program 7 times [2018-10-24 12:34:55,868 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:55,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:55,869 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:55,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:55,869 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:55,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:56,165 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:56,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:56,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:56,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:56,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:56,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:56,167 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 12:34:56,177 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:56,177 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:56,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:56,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:56,264 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:56,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:56,887 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:56,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:56,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:34:56,908 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:56,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:34:56,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:34:56,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=1009, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:34:56,910 INFO L87 Difference]: Start difference. First operand 122 states and 136 transitions. Second operand 22 states. [2018-10-24 12:34:57,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:57,111 INFO L93 Difference]: Finished difference Result 193 states and 212 transitions. [2018-10-24 12:34:57,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:34:57,111 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 69 [2018-10-24 12:34:57,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:57,114 INFO L225 Difference]: With dead ends: 193 [2018-10-24 12:34:57,114 INFO L226 Difference]: Without dead ends: 187 [2018-10-24 12:34:57,115 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=719, Invalid=1087, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:34:57,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-24 12:34:57,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 129. [2018-10-24 12:34:57,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-24 12:34:57,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 144 transitions. [2018-10-24 12:34:57,122 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 144 transitions. Word has length 69 [2018-10-24 12:34:57,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:57,122 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 144 transitions. [2018-10-24 12:34:57,122 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:34:57,123 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 144 transitions. [2018-10-24 12:34:57,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-10-24 12:34:57,124 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:57,124 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:57,124 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:57,125 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:57,125 INFO L82 PathProgramCache]: Analyzing trace with hash 1957710356, now seen corresponding path program 8 times [2018-10-24 12:34:57,125 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:57,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:57,126 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:57,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:57,126 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:57,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:57,400 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 12:34:57,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:57,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:57,401 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:57,401 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:57,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:57,401 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 12:34:57,408 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:57,408 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:57,489 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:34:57,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:57,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:58,080 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-24 12:34:58,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:58,221 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-24 12:34:58,241 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:58,242 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 9, 9] total 35 [2018-10-24 12:34:58,242 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:58,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:34:58,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:34:58,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=475, Invalid=715, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:34:58,244 INFO L87 Difference]: Start difference. First operand 129 states and 144 transitions. Second operand 28 states. [2018-10-24 12:34:58,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:58,659 INFO L93 Difference]: Finished difference Result 263 states and 293 transitions. [2018-10-24 12:34:58,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:34:58,659 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 72 [2018-10-24 12:34:58,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:58,661 INFO L225 Difference]: With dead ends: 263 [2018-10-24 12:34:58,661 INFO L226 Difference]: Without dead ends: 247 [2018-10-24 12:34:58,663 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=481, Invalid=779, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:34:58,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-24 12:34:58,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 167. [2018-10-24 12:34:58,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:34:58,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 187 transitions. [2018-10-24 12:34:58,670 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 187 transitions. Word has length 72 [2018-10-24 12:34:58,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:58,670 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 187 transitions. [2018-10-24 12:34:58,670 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:34:58,670 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 187 transitions. [2018-10-24 12:34:58,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-10-24 12:34:58,672 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:58,673 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:58,673 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:58,673 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:58,673 INFO L82 PathProgramCache]: Analyzing trace with hash -1693515634, now seen corresponding path program 9 times [2018-10-24 12:34:58,673 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:58,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:58,674 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:58,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:58,675 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:58,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:59,681 INFO L134 CoverageAnalysis]: Checked inductivity of 615 backedges. 0 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:59,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:59,682 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:59,682 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:59,682 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:59,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:59,682 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 12:34:59,691 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:59,691 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:59,732 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:59,732 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:59,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:59,839 INFO L134 CoverageAnalysis]: Checked inductivity of 615 backedges. 0 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:59,839 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:01,774 INFO L134 CoverageAnalysis]: Checked inductivity of 615 backedges. 0 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:01,803 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:01,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-24 12:35:01,804 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:01,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:35:01,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:35:01,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:35:01,807 INFO L87 Difference]: Start difference. First operand 167 states and 187 transitions. Second operand 29 states. [2018-10-24 12:35:02,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:02,130 INFO L93 Difference]: Finished difference Result 260 states and 286 transitions. [2018-10-24 12:35:02,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:35:02,130 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 90 [2018-10-24 12:35:02,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:02,133 INFO L225 Difference]: With dead ends: 260 [2018-10-24 12:35:02,133 INFO L226 Difference]: Without dead ends: 254 [2018-10-24 12:35:02,135 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 153 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:35:02,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-24 12:35:02,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 174. [2018-10-24 12:35:02,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-24 12:35:02,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 195 transitions. [2018-10-24 12:35:02,139 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 195 transitions. Word has length 90 [2018-10-24 12:35:02,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:02,140 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 195 transitions. [2018-10-24 12:35:02,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:35:02,140 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 195 transitions. [2018-10-24 12:35:02,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-24 12:35:02,142 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:02,142 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:02,142 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:02,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:02,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1143150669, now seen corresponding path program 10 times [2018-10-24 12:35:02,143 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:02,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:02,144 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:02,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:02,144 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:02,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:02,557 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:02,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:02,557 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:02,558 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:02,558 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:02,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:02,558 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 12:35:02,574 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:02,574 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:02,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:02,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:02,692 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:02,692 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:03,550 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:03,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:03,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-24 12:35:03,571 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:03,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:35:03,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:35:03,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1441, Invalid=1865, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:35:03,573 INFO L87 Difference]: Start difference. First operand 174 states and 195 transitions. Second operand 30 states. [2018-10-24 12:35:03,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:03,835 INFO L93 Difference]: Finished difference Result 267 states and 294 transitions. [2018-10-24 12:35:03,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:35:03,835 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 93 [2018-10-24 12:35:03,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:03,837 INFO L225 Difference]: With dead ends: 267 [2018-10-24 12:35:03,838 INFO L226 Difference]: Without dead ends: 261 [2018-10-24 12:35:03,840 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 158 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1447, Invalid=1975, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:35:03,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2018-10-24 12:35:03,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 181. [2018-10-24 12:35:03,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-10-24 12:35:03,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 203 transitions. [2018-10-24 12:35:03,845 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 203 transitions. Word has length 93 [2018-10-24 12:35:03,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:03,845 INFO L481 AbstractCegarLoop]: Abstraction has 181 states and 203 transitions. [2018-10-24 12:35:03,845 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:35:03,846 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 203 transitions. [2018-10-24 12:35:03,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-24 12:35:03,847 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:03,847 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:03,847 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:03,847 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:03,848 INFO L82 PathProgramCache]: Analyzing trace with hash 492467246, now seen corresponding path program 11 times [2018-10-24 12:35:03,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:03,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:03,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:03,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:03,849 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:03,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:04,321 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:04,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:04,321 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:04,321 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:04,321 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:04,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:04,321 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 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 12:35:04,329 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:04,329 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:04,350 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:35:04,350 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:04,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:04,534 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2018-10-24 12:35:04,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:04,838 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2018-10-24 12:35:04,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:04,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 10, 10] total 45 [2018-10-24 12:35:04,860 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:04,861 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:35:04,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:35:04,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=830, Invalid=1150, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:35:04,862 INFO L87 Difference]: Start difference. First operand 181 states and 203 transitions. Second operand 37 states. [2018-10-24 12:35:05,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:05,366 INFO L93 Difference]: Finished difference Result 358 states and 398 transitions. [2018-10-24 12:35:05,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:35:05,367 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 96 [2018-10-24 12:35:05,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:05,369 INFO L225 Difference]: With dead ends: 358 [2018-10-24 12:35:05,369 INFO L226 Difference]: Without dead ends: 340 [2018-10-24 12:35:05,371 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=836, Invalid=1234, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:35:05,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2018-10-24 12:35:05,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 226. [2018-10-24 12:35:05,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-24 12:35:05,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 254 transitions. [2018-10-24 12:35:05,377 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 254 transitions. Word has length 96 [2018-10-24 12:35:05,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:05,378 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 254 transitions. [2018-10-24 12:35:05,378 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:35:05,378 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 254 transitions. [2018-10-24 12:35:05,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-24 12:35:05,379 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:05,380 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 27, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:05,380 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:05,380 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:05,380 INFO L82 PathProgramCache]: Analyzing trace with hash 494608371, now seen corresponding path program 12 times [2018-10-24 12:35:05,380 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:05,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,381 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:05,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,381 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:05,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:06,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1197 backedges. 0 proven. 1197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:06,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:06,080 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:06,080 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:06,080 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:06,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:06,080 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 12:35:06,088 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:06,088 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:06,138 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:06,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:06,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:06,238 INFO L134 CoverageAnalysis]: Checked inductivity of 1197 backedges. 0 proven. 1197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:06,238 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:07,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1197 backedges. 0 proven. 1197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:07,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:07,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-24 12:35:07,817 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:07,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:35:07,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:35:07,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:35:07,820 INFO L87 Difference]: Start difference. First operand 226 states and 254 transitions. Second operand 38 states. [2018-10-24 12:35:08,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:08,236 INFO L93 Difference]: Finished difference Result 344 states and 379 transitions. [2018-10-24 12:35:08,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:35:08,237 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 117 [2018-10-24 12:35:08,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:08,239 INFO L225 Difference]: With dead ends: 344 [2018-10-24 12:35:08,240 INFO L226 Difference]: Without dead ends: 338 [2018-10-24 12:35:08,242 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 198 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2431, Invalid=3119, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:35:08,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2018-10-24 12:35:08,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 233. [2018-10-24 12:35:08,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2018-10-24 12:35:08,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 262 transitions. [2018-10-24 12:35:08,247 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 262 transitions. Word has length 117 [2018-10-24 12:35:08,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:08,247 INFO L481 AbstractCegarLoop]: Abstraction has 233 states and 262 transitions. [2018-10-24 12:35:08,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:35:08,248 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 262 transitions. [2018-10-24 12:35:08,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-10-24 12:35:08,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:08,249 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:08,249 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:08,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:08,250 INFO L82 PathProgramCache]: Analyzing trace with hash -612030252, now seen corresponding path program 13 times [2018-10-24 12:35:08,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:08,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:08,251 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:08,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:08,251 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:08,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:09,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:09,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:09,014 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:09,014 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:09,015 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:09,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:09,015 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 12:35:09,026 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:09,026 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:09,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:09,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:09,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:09,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:10,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:10,982 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:10,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-24 12:35:10,982 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:10,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:35:10,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:35:10,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2566, Invalid=3134, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:35:10,985 INFO L87 Difference]: Start difference. First operand 233 states and 262 transitions. Second operand 39 states. [2018-10-24 12:35:11,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:11,445 INFO L93 Difference]: Finished difference Result 351 states and 387 transitions. [2018-10-24 12:35:11,445 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:35:11,446 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 120 [2018-10-24 12:35:11,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:11,448 INFO L225 Difference]: With dead ends: 351 [2018-10-24 12:35:11,448 INFO L226 Difference]: Without dead ends: 345 [2018-10-24 12:35:11,451 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 203 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2572, Invalid=3280, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:35:11,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-10-24 12:35:11,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 240. [2018-10-24 12:35:11,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2018-10-24 12:35:11,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 270 transitions. [2018-10-24 12:35:11,457 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 270 transitions. Word has length 120 [2018-10-24 12:35:11,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:11,457 INFO L481 AbstractCegarLoop]: Abstraction has 240 states and 270 transitions. [2018-10-24 12:35:11,457 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:35:11,457 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 270 transitions. [2018-10-24 12:35:11,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-24 12:35:11,459 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:11,459 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 29, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:11,459 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:11,459 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:11,460 INFO L82 PathProgramCache]: Analyzing trace with hash -314283949, now seen corresponding path program 14 times [2018-10-24 12:35:11,460 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:11,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:11,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,461 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:11,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:12,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 1368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:12,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:12,284 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:12,284 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:12,285 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:12,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:12,285 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 12:35:12,292 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:12,292 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:12,315 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:35:12,315 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:12,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:12,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-24 12:35:12,549 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:12,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-24 12:35:12,865 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:12,865 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 11, 11] total 56 [2018-10-24 12:35:12,866 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:12,866 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:35:12,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:35:12,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:35:12,868 INFO L87 Difference]: Start difference. First operand 240 states and 270 transitions. Second operand 47 states. [2018-10-24 12:35:13,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:13,859 INFO L93 Difference]: Finished difference Result 466 states and 517 transitions. [2018-10-24 12:35:13,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:35:13,860 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 123 [2018-10-24 12:35:13,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:13,862 INFO L225 Difference]: With dead ends: 466 [2018-10-24 12:35:13,862 INFO L226 Difference]: Without dead ends: 446 [2018-10-24 12:35:13,865 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 230 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:35:13,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2018-10-24 12:35:13,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 292. [2018-10-24 12:35:13,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2018-10-24 12:35:13,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 329 transitions. [2018-10-24 12:35:13,874 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 329 transitions. Word has length 123 [2018-10-24 12:35:13,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:13,875 INFO L481 AbstractCegarLoop]: Abstraction has 292 states and 329 transitions. [2018-10-24 12:35:13,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:35:13,875 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 329 transitions. [2018-10-24 12:35:13,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-24 12:35:13,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:13,877 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 36, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:13,877 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:13,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:13,878 INFO L82 PathProgramCache]: Analyzing trace with hash -755226131, now seen corresponding path program 15 times [2018-10-24 12:35:13,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:13,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:13,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:13,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:13,880 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:13,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:15,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 0 proven. 2082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:15,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:15,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:15,316 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:15,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:15,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:15,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:35:15,325 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:15,325 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:15,382 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:15,382 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:15,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:15,458 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 0 proven. 2082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:15,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:18,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 0 proven. 2082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:18,445 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:18,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-24 12:35:18,445 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:18,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:35:18,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:35:18,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4015, Invalid=4727, Unknown=0, NotChecked=0, Total=8742 [2018-10-24 12:35:18,448 INFO L87 Difference]: Start difference. First operand 292 states and 329 transitions. Second operand 48 states. [2018-10-24 12:35:19,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:19,076 INFO L93 Difference]: Finished difference Result 438 states and 483 transitions. [2018-10-24 12:35:19,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-24 12:35:19,079 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 147 [2018-10-24 12:35:19,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:19,081 INFO L225 Difference]: With dead ends: 438 [2018-10-24 12:35:19,081 INFO L226 Difference]: Without dead ends: 432 [2018-10-24 12:35:19,082 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 248 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4021, Invalid=4909, Unknown=0, NotChecked=0, Total=8930 [2018-10-24 12:35:19,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2018-10-24 12:35:19,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 299. [2018-10-24 12:35:19,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-10-24 12:35:19,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 337 transitions. [2018-10-24 12:35:19,089 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 337 transitions. Word has length 147 [2018-10-24 12:35:19,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:19,090 INFO L481 AbstractCegarLoop]: Abstraction has 299 states and 337 transitions. [2018-10-24 12:35:19,090 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:35:19,090 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 337 transitions. [2018-10-24 12:35:19,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-24 12:35:19,091 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:19,091 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:19,092 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:19,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:19,092 INFO L82 PathProgramCache]: Analyzing trace with hash -1973406962, now seen corresponding path program 16 times [2018-10-24 12:35:19,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:19,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:19,093 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:19,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:19,093 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:19,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:20,537 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:20,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:20,537 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:20,537 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:20,538 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:20,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:20,538 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 12:35:20,548 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:20,548 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:20,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:20,600 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:20,670 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:20,670 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:23,301 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:23,321 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:23,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-24 12:35:23,322 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:23,322 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:35:23,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:35:23,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:35:23,324 INFO L87 Difference]: Start difference. First operand 299 states and 337 transitions. Second operand 49 states. [2018-10-24 12:35:24,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:24,090 INFO L93 Difference]: Finished difference Result 445 states and 491 transitions. [2018-10-24 12:35:24,090 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:35:24,090 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 150 [2018-10-24 12:35:24,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:24,093 INFO L225 Difference]: With dead ends: 445 [2018-10-24 12:35:24,093 INFO L226 Difference]: Without dead ends: 439 [2018-10-24 12:35:24,095 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 253 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:35:24,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2018-10-24 12:35:24,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 306. [2018-10-24 12:35:24,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2018-10-24 12:35:24,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 345 transitions. [2018-10-24 12:35:24,102 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 345 transitions. Word has length 150 [2018-10-24 12:35:24,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:24,102 INFO L481 AbstractCegarLoop]: Abstraction has 306 states and 345 transitions. [2018-10-24 12:35:24,102 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:35:24,102 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 345 transitions. [2018-10-24 12:35:24,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-24 12:35:24,104 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:24,104 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 38, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:24,104 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:24,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:24,105 INFO L82 PathProgramCache]: Analyzing trace with hash -324892083, now seen corresponding path program 17 times [2018-10-24 12:35:24,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:24,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:24,106 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:24,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:24,106 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:24,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:25,033 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 2307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:25,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:25,033 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:25,033 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:25,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:25,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:25,033 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 12:35:25,041 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:25,041 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:25,071 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:35:25,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:25,074 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:25,536 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-24 12:35:25,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:26,429 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-24 12:35:26,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:26,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 12, 12] total 68 [2018-10-24 12:35:26,449 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:26,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-24 12:35:26,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-24 12:35:26,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=2530, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:35:26,451 INFO L87 Difference]: Start difference. First operand 306 states and 345 transitions. Second operand 58 states. [2018-10-24 12:35:27,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:27,463 INFO L93 Difference]: Finished difference Result 587 states and 650 transitions. [2018-10-24 12:35:27,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-24 12:35:27,463 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 153 [2018-10-24 12:35:27,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:27,466 INFO L225 Difference]: With dead ends: 587 [2018-10-24 12:35:27,466 INFO L226 Difference]: Without dead ends: 565 [2018-10-24 12:35:27,467 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 288 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:35:27,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2018-10-24 12:35:27,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 365. [2018-10-24 12:35:27,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 365 states. [2018-10-24 12:35:27,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 412 transitions. [2018-10-24 12:35:27,475 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 412 transitions. Word has length 153 [2018-10-24 12:35:27,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:27,476 INFO L481 AbstractCegarLoop]: Abstraction has 365 states and 412 transitions. [2018-10-24 12:35:27,476 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-24 12:35:27,476 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 412 transitions. [2018-10-24 12:35:27,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-10-24 12:35:27,478 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:27,478 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:27,479 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:27,479 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:27,479 INFO L82 PathProgramCache]: Analyzing trace with hash 752334548, now seen corresponding path program 18 times [2018-10-24 12:35:27,479 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:27,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:27,480 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:27,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:27,480 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:27,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:29,194 INFO L134 CoverageAnalysis]: Checked inductivity of 3351 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:29,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:29,194 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:29,194 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:29,195 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:29,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:29,195 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 12:35:29,204 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:29,205 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:29,286 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:29,286 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:29,289 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:29,373 INFO L134 CoverageAnalysis]: Checked inductivity of 3351 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:29,373 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:33,063 INFO L134 CoverageAnalysis]: Checked inductivity of 3351 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:33,083 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:33,083 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-24 12:35:33,083 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:33,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-24 12:35:33,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-24 12:35:33,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6226, Invalid=7114, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:35:33,086 INFO L87 Difference]: Start difference. First operand 365 states and 412 transitions. Second operand 59 states. [2018-10-24 12:35:34,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:34,254 INFO L93 Difference]: Finished difference Result 542 states and 598 transitions. [2018-10-24 12:35:34,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:35:34,257 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 180 [2018-10-24 12:35:34,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:34,260 INFO L225 Difference]: With dead ends: 542 [2018-10-24 12:35:34,261 INFO L226 Difference]: Without dead ends: 536 [2018-10-24 12:35:34,262 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 303 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=6232, Invalid=7340, Unknown=0, NotChecked=0, Total=13572 [2018-10-24 12:35:34,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2018-10-24 12:35:34,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 372. [2018-10-24 12:35:34,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2018-10-24 12:35:34,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 420 transitions. [2018-10-24 12:35:34,269 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 420 transitions. Word has length 180 [2018-10-24 12:35:34,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:34,270 INFO L481 AbstractCegarLoop]: Abstraction has 372 states and 420 transitions. [2018-10-24 12:35:34,270 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-24 12:35:34,270 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 420 transitions. [2018-10-24 12:35:34,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-24 12:35:34,272 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:34,272 INFO L375 BasicCegarLoop]: trace histogram [48, 48, 47, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:34,272 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:34,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:34,273 INFO L82 PathProgramCache]: Analyzing trace with hash -252635693, now seen corresponding path program 19 times [2018-10-24 12:35:34,273 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:34,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:34,273 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:34,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:34,274 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:34,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:35,705 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:35,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:35,706 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:35,706 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:35,706 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:35,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:35,706 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 12:35:35,713 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:35,713 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:35,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:35,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:35,867 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:35,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:39,701 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:39,721 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:39,722 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-24 12:35:39,722 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:39,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-24 12:35:39,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-24 12:35:39,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6451, Invalid=7355, Unknown=0, NotChecked=0, Total=13806 [2018-10-24 12:35:39,724 INFO L87 Difference]: Start difference. First operand 372 states and 420 transitions. Second operand 60 states. [2018-10-24 12:35:41,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:41,069 INFO L93 Difference]: Finished difference Result 549 states and 606 transitions. [2018-10-24 12:35:41,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-24 12:35:41,070 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 183 [2018-10-24 12:35:41,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:41,074 INFO L225 Difference]: With dead ends: 549 [2018-10-24 12:35:41,075 INFO L226 Difference]: Without dead ends: 543 [2018-10-24 12:35:41,075 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 308 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=6457, Invalid=7585, Unknown=0, NotChecked=0, Total=14042 [2018-10-24 12:35:41,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2018-10-24 12:35:41,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 379. [2018-10-24 12:35:41,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-10-24 12:35:41,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 428 transitions. [2018-10-24 12:35:41,083 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 428 transitions. Word has length 183 [2018-10-24 12:35:41,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:41,084 INFO L481 AbstractCegarLoop]: Abstraction has 379 states and 428 transitions. [2018-10-24 12:35:41,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-24 12:35:41,084 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 428 transitions. [2018-10-24 12:35:41,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-24 12:35:41,085 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:41,086 INFO L375 BasicCegarLoop]: trace histogram [49, 49, 48, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:41,086 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:41,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:41,086 INFO L82 PathProgramCache]: Analyzing trace with hash 895935092, now seen corresponding path program 20 times [2018-10-24 12:35:41,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:41,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:41,087 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:41,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:41,087 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:41,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:42,711 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 3636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:42,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:42,711 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:42,712 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:42,712 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:42,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:42,712 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 12:35:42,719 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:42,720 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:42,752 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:35:42,752 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:42,755 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:43,229 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3528 trivial. 0 not checked. [2018-10-24 12:35:43,230 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:43,773 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3528 trivial. 0 not checked. [2018-10-24 12:35:43,793 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:43,794 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 13, 13] total 81 [2018-10-24 12:35:43,794 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:43,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-24 12:35:43,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-24 12:35:43,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2936, Invalid=3544, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:35:43,796 INFO L87 Difference]: Start difference. First operand 379 states and 428 transitions. Second operand 70 states. [2018-10-24 12:35:46,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:46,880 INFO L93 Difference]: Finished difference Result 721 states and 797 transitions. [2018-10-24 12:35:46,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-24 12:35:46,880 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 186 [2018-10-24 12:35:46,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:46,883 INFO L225 Difference]: With dead ends: 721 [2018-10-24 12:35:46,883 INFO L226 Difference]: Without dead ends: 697 [2018-10-24 12:35:46,884 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 352 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2942, Invalid=3700, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:35:46,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2018-10-24 12:35:46,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 445. [2018-10-24 12:35:46,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 445 states. [2018-10-24 12:35:46,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 503 transitions. [2018-10-24 12:35:46,894 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 503 transitions. Word has length 186 [2018-10-24 12:35:46,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:46,894 INFO L481 AbstractCegarLoop]: Abstraction has 445 states and 503 transitions. [2018-10-24 12:35:46,894 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-24 12:35:46,895 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 503 transitions. [2018-10-24 12:35:46,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-10-24 12:35:46,896 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:46,896 INFO L375 BasicCegarLoop]: trace histogram [58, 58, 57, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:46,897 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:46,897 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:46,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1102113070, now seen corresponding path program 21 times [2018-10-24 12:35:46,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:46,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:46,898 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:46,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:46,898 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:46,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:48,843 INFO L134 CoverageAnalysis]: Checked inductivity of 5094 backedges. 0 proven. 5094 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:48,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:48,844 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:48,844 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:48,844 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:48,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:48,844 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 12:35:48,851 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:48,851 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:48,922 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:48,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:48,927 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:49,044 INFO L134 CoverageAnalysis]: Checked inductivity of 5094 backedges. 0 proven. 5094 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:49,044 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:54,370 INFO L134 CoverageAnalysis]: Checked inductivity of 5094 backedges. 0 proven. 5094 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:54,390 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:54,390 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-24 12:35:54,390 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:54,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-24 12:35:54,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-24 12:35:54,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9190, Invalid=10270, Unknown=0, NotChecked=0, Total=19460 [2018-10-24 12:35:54,392 INFO L87 Difference]: Start difference. First operand 445 states and 503 transitions. Second operand 71 states. [2018-10-24 12:35:56,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:56,748 INFO L93 Difference]: Finished difference Result 656 states and 724 transitions. [2018-10-24 12:35:56,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:35:56,748 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 216 [2018-10-24 12:35:56,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:56,752 INFO L225 Difference]: With dead ends: 656 [2018-10-24 12:35:56,753 INFO L226 Difference]: Without dead ends: 650 [2018-10-24 12:35:56,754 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 363 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=9196, Invalid=10544, Unknown=0, NotChecked=0, Total=19740 [2018-10-24 12:35:56,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 650 states. [2018-10-24 12:35:56,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 650 to 452. [2018-10-24 12:35:56,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2018-10-24 12:35:56,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 511 transitions. [2018-10-24 12:35:56,763 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 511 transitions. Word has length 216 [2018-10-24 12:35:56,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:56,763 INFO L481 AbstractCegarLoop]: Abstraction has 452 states and 511 transitions. [2018-10-24 12:35:56,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-24 12:35:56,764 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 511 transitions. [2018-10-24 12:35:56,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-24 12:35:56,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:56,765 INFO L375 BasicCegarLoop]: trace histogram [59, 59, 58, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:56,766 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:56,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:56,766 INFO L82 PathProgramCache]: Analyzing trace with hash -518064979, now seen corresponding path program 22 times [2018-10-24 12:35:56,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:56,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:56,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:56,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:56,767 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:56,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:59,030 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:59,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:59,030 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:59,031 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:59,031 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:59,031 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:59,031 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 12:35:59,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:59,047 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:59,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:59,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:59,254 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:59,254 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:04,850 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:04,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:04,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 142 [2018-10-24 12:36:04,880 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:04,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-24 12:36:04,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-24 12:36:04,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9463, Invalid=10559, Unknown=0, NotChecked=0, Total=20022 [2018-10-24 12:36:04,884 INFO L87 Difference]: Start difference. First operand 452 states and 511 transitions. Second operand 72 states. [2018-10-24 12:36:07,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:07,252 INFO L93 Difference]: Finished difference Result 663 states and 732 transitions. [2018-10-24 12:36:07,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-24 12:36:07,253 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 219 [2018-10-24 12:36:07,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:07,257 INFO L225 Difference]: With dead ends: 663 [2018-10-24 12:36:07,257 INFO L226 Difference]: Without dead ends: 657 [2018-10-24 12:36:07,258 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 368 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=9469, Invalid=10837, Unknown=0, NotChecked=0, Total=20306 [2018-10-24 12:36:07,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2018-10-24 12:36:07,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 459. [2018-10-24 12:36:07,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 459 states. [2018-10-24 12:36:07,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 519 transitions. [2018-10-24 12:36:07,269 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 519 transitions. Word has length 219 [2018-10-24 12:36:07,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:07,269 INFO L481 AbstractCegarLoop]: Abstraction has 459 states and 519 transitions. [2018-10-24 12:36:07,269 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-24 12:36:07,269 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 519 transitions. [2018-10-24 12:36:07,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-24 12:36:07,271 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:07,271 INFO L375 BasicCegarLoop]: trace histogram [60, 60, 59, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:07,271 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:07,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:07,272 INFO L82 PathProgramCache]: Analyzing trace with hash -399850290, now seen corresponding path program 23 times [2018-10-24 12:36:07,272 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:07,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:07,273 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:07,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:07,273 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:07,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:09,646 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 5445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:09,646 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:09,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:09,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:09,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:09,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:09,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:36:09,657 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:09,657 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:09,820 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:36:09,820 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:09,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:10,416 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5310 trivial. 0 not checked. [2018-10-24 12:36:10,416 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:11,113 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5310 trivial. 0 not checked. [2018-10-24 12:36:11,133 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:11,133 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 14, 14] total 95 [2018-10-24 12:36:11,133 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:11,134 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-10-24 12:36:11,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-10-24 12:36:11,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4105, Invalid=4825, Unknown=0, NotChecked=0, Total=8930 [2018-10-24 12:36:11,135 INFO L87 Difference]: Start difference. First operand 459 states and 519 transitions. Second operand 83 states. [2018-10-24 12:36:13,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:13,677 INFO L93 Difference]: Finished difference Result 868 states and 958 transitions. [2018-10-24 12:36:13,682 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-10-24 12:36:13,682 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 222 [2018-10-24 12:36:13,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:13,685 INFO L225 Difference]: With dead ends: 868 [2018-10-24 12:36:13,685 INFO L226 Difference]: Without dead ends: 842 [2018-10-24 12:36:13,686 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 422 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4111, Invalid=5009, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:36:13,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2018-10-24 12:36:13,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 532. [2018-10-24 12:36:13,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 532 states. [2018-10-24 12:36:13,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 602 transitions. [2018-10-24 12:36:13,696 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 602 transitions. Word has length 222 [2018-10-24 12:36:13,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:13,696 INFO L481 AbstractCegarLoop]: Abstraction has 532 states and 602 transitions. [2018-10-24 12:36:13,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-10-24 12:36:13,696 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 602 transitions. [2018-10-24 12:36:13,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-24 12:36:13,698 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:13,698 INFO L375 BasicCegarLoop]: trace histogram [70, 70, 69, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:13,699 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:13,699 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:13,699 INFO L82 PathProgramCache]: Analyzing trace with hash -1768862701, now seen corresponding path program 24 times [2018-10-24 12:36:13,699 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:13,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:13,700 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:13,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:13,700 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:13,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:16,313 INFO L134 CoverageAnalysis]: Checked inductivity of 7410 backedges. 0 proven. 7410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:16,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:16,314 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:16,314 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:16,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:16,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:16,314 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 12:36:16,321 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:16,321 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:16,398 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:16,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:16,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:16,633 INFO L134 CoverageAnalysis]: Checked inductivity of 7410 backedges. 0 proven. 7410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:16,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:24,323 INFO L134 CoverageAnalysis]: Checked inductivity of 7410 backedges. 0 proven. 7410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:24,344 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:24,344 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 166 [2018-10-24 12:36:24,344 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:24,345 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-10-24 12:36:24,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-10-24 12:36:24,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13051, Invalid=14339, Unknown=0, NotChecked=0, Total=27390 [2018-10-24 12:36:24,347 INFO L87 Difference]: Start difference. First operand 532 states and 602 transitions. Second operand 84 states. [2018-10-24 12:36:27,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:27,424 INFO L93 Difference]: Finished difference Result 780 states and 861 transitions. [2018-10-24 12:36:27,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-10-24 12:36:27,424 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 255 [2018-10-24 12:36:27,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:27,429 INFO L225 Difference]: With dead ends: 780 [2018-10-24 12:36:27,429 INFO L226 Difference]: Without dead ends: 774 [2018-10-24 12:36:27,430 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 428 SyntacticMatches, 1 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=13057, Invalid=14665, Unknown=0, NotChecked=0, Total=27722 [2018-10-24 12:36:27,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 774 states. [2018-10-24 12:36:27,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 774 to 539. [2018-10-24 12:36:27,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 539 states. [2018-10-24 12:36:27,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 610 transitions. [2018-10-24 12:36:27,439 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 610 transitions. Word has length 255 [2018-10-24 12:36:27,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:27,440 INFO L481 AbstractCegarLoop]: Abstraction has 539 states and 610 transitions. [2018-10-24 12:36:27,440 INFO L482 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-10-24 12:36:27,440 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 610 transitions. [2018-10-24 12:36:27,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-10-24 12:36:27,442 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:27,442 INFO L375 BasicCegarLoop]: trace histogram [71, 71, 70, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:27,442 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:27,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:27,443 INFO L82 PathProgramCache]: Analyzing trace with hash 412573620, now seen corresponding path program 25 times [2018-10-24 12:36:27,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:27,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:27,444 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:27,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:27,444 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:27,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:30,266 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:30,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:30,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:30,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:30,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:30,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:30,267 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 12:36:30,279 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:30,279 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:30,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:30,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:30,539 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:30,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:38,514 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:38,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:38,552 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 168 [2018-10-24 12:36:38,552 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:38,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-10-24 12:36:38,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-10-24 12:36:38,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13376, Invalid=14680, Unknown=0, NotChecked=0, Total=28056 [2018-10-24 12:36:38,555 INFO L87 Difference]: Start difference. First operand 539 states and 610 transitions. Second operand 85 states. [2018-10-24 12:36:42,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:42,285 INFO L93 Difference]: Finished difference Result 787 states and 869 transitions. [2018-10-24 12:36:42,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-10-24 12:36:42,285 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 258 [2018-10-24 12:36:42,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:42,291 INFO L225 Difference]: With dead ends: 787 [2018-10-24 12:36:42,291 INFO L226 Difference]: Without dead ends: 781 [2018-10-24 12:36:42,292 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 433 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=13382, Invalid=15010, Unknown=0, NotChecked=0, Total=28392 [2018-10-24 12:36:42,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2018-10-24 12:36:42,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 546. [2018-10-24 12:36:42,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 546 states. [2018-10-24 12:36:42,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 546 states to 546 states and 618 transitions. [2018-10-24 12:36:42,301 INFO L78 Accepts]: Start accepts. Automaton has 546 states and 618 transitions. Word has length 258 [2018-10-24 12:36:42,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:42,302 INFO L481 AbstractCegarLoop]: Abstraction has 546 states and 618 transitions. [2018-10-24 12:36:42,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-10-24 12:36:42,302 INFO L276 IsEmpty]: Start isEmpty. Operand 546 states and 618 transitions. [2018-10-24 12:36:42,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-24 12:36:42,304 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:42,305 INFO L375 BasicCegarLoop]: trace histogram [72, 72, 71, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:42,305 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:42,305 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:42,305 INFO L82 PathProgramCache]: Analyzing trace with hash 431856755, now seen corresponding path program 26 times [2018-10-24 12:36:42,305 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:42,306 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:42,306 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:42,306 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:42,306 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:42,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:45,236 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7833 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:45,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:45,236 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:45,237 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:45,237 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:45,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:45,237 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 12:36:45,244 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:45,245 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:45,399 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:36:45,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:45,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:47,084 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7668 trivial. 0 not checked. [2018-10-24 12:36:47,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:48,284 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7668 trivial. 0 not checked. [2018-10-24 12:36:48,304 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:48,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 15, 15] total 110 [2018-10-24 12:36:48,305 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:48,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-10-24 12:36:48,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-10-24 12:36:48,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5575, Invalid=6415, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:36:48,307 INFO L87 Difference]: Start difference. First operand 546 states and 618 transitions. Second operand 97 states. [2018-10-24 12:36:52,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:52,559 INFO L93 Difference]: Finished difference Result 1028 states and 1133 transitions. [2018-10-24 12:36:52,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-10-24 12:36:52,559 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 261 [2018-10-24 12:36:52,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:52,564 INFO L225 Difference]: With dead ends: 1028 [2018-10-24 12:36:52,564 INFO L226 Difference]: Without dead ends: 1000 [2018-10-24 12:36:52,566 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 608 GetRequests, 498 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 471 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=5581, Invalid=6629, Unknown=0, NotChecked=0, Total=12210 [2018-10-24 12:36:52,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1000 states. [2018-10-24 12:36:52,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1000 to 626. [2018-10-24 12:36:52,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 626 states. [2018-10-24 12:36:52,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 626 states to 626 states and 709 transitions. [2018-10-24 12:36:52,575 INFO L78 Accepts]: Start accepts. Automaton has 626 states and 709 transitions. Word has length 261 [2018-10-24 12:36:52,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:52,575 INFO L481 AbstractCegarLoop]: Abstraction has 626 states and 709 transitions. [2018-10-24 12:36:52,575 INFO L482 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-10-24 12:36:52,575 INFO L276 IsEmpty]: Start isEmpty. Operand 626 states and 709 transitions. [2018-10-24 12:36:52,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-10-24 12:36:52,578 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:52,578 INFO L375 BasicCegarLoop]: trace histogram [83, 83, 82, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:52,578 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:52,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:52,579 INFO L82 PathProgramCache]: Analyzing trace with hash -1637142579, now seen corresponding path program 27 times [2018-10-24 12:36:52,579 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:52,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:52,580 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:52,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:52,580 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:52,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:56,324 INFO L134 CoverageAnalysis]: Checked inductivity of 10407 backedges. 0 proven. 10407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:56,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:56,324 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:56,324 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:56,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:56,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:56,325 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 12:36:56,332 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:56,332 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:56,426 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:56,426 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:56,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:56,819 INFO L134 CoverageAnalysis]: Checked inductivity of 10407 backedges. 0 proven. 10407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:36:56,819 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:07,091 INFO L134 CoverageAnalysis]: Checked inductivity of 10407 backedges. 0 proven. 10407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:07,113 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:07,113 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 194 [2018-10-24 12:37:07,113 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:07,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-10-24 12:37:07,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-10-24 12:37:07,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17965, Invalid=19477, Unknown=0, NotChecked=0, Total=37442 [2018-10-24 12:37:07,117 INFO L87 Difference]: Start difference. First operand 626 states and 709 transitions. Second operand 98 states. [2018-10-24 12:37:12,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:12,269 INFO L93 Difference]: Finished difference Result 914 states and 1009 transitions. [2018-10-24 12:37:12,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-10-24 12:37:12,270 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 297 [2018-10-24 12:37:12,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:12,274 INFO L225 Difference]: With dead ends: 914 [2018-10-24 12:37:12,274 INFO L226 Difference]: Without dead ends: 908 [2018-10-24 12:37:12,276 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 692 GetRequests, 498 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 747 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=17971, Invalid=19859, Unknown=0, NotChecked=0, Total=37830 [2018-10-24 12:37:12,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 908 states. [2018-10-24 12:37:12,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 908 to 633. [2018-10-24 12:37:12,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 633 states. [2018-10-24 12:37:12,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 633 states to 633 states and 717 transitions. [2018-10-24 12:37:12,284 INFO L78 Accepts]: Start accepts. Automaton has 633 states and 717 transitions. Word has length 297 [2018-10-24 12:37:12,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:12,285 INFO L481 AbstractCegarLoop]: Abstraction has 633 states and 717 transitions. [2018-10-24 12:37:12,285 INFO L482 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-10-24 12:37:12,285 INFO L276 IsEmpty]: Start isEmpty. Operand 633 states and 717 transitions. [2018-10-24 12:37:12,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2018-10-24 12:37:12,287 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:12,287 INFO L375 BasicCegarLoop]: trace histogram [84, 84, 83, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:12,288 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:12,288 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:12,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1112549934, now seen corresponding path program 28 times [2018-10-24 12:37:12,288 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:12,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:12,289 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:12,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:12,289 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:12,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:16,127 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:16,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:16,127 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:16,127 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:16,127 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:16,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:16,128 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:16,135 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:16,135 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:16,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:16,231 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:16,543 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:16,544 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:27,130 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:27,151 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:27,152 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 196 [2018-10-24 12:37:27,152 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:27,152 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-10-24 12:37:27,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-10-24 12:37:27,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18346, Invalid=19874, Unknown=0, NotChecked=0, Total=38220 [2018-10-24 12:37:27,155 INFO L87 Difference]: Start difference. First operand 633 states and 717 transitions. Second operand 99 states. [2018-10-24 12:37:32,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:32,586 INFO L93 Difference]: Finished difference Result 921 states and 1017 transitions. [2018-10-24 12:37:32,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-10-24 12:37:32,587 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 300 [2018-10-24 12:37:32,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:32,591 INFO L225 Difference]: With dead ends: 921 [2018-10-24 12:37:32,591 INFO L226 Difference]: Without dead ends: 915 [2018-10-24 12:37:32,593 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 699 GetRequests, 503 SyntacticMatches, 1 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=18352, Invalid=20260, Unknown=0, NotChecked=0, Total=38612 [2018-10-24 12:37:32,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 915 states. [2018-10-24 12:37:32,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 915 to 640. [2018-10-24 12:37:32,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 640 states. [2018-10-24 12:37:32,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 725 transitions. [2018-10-24 12:37:32,602 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 725 transitions. Word has length 300 [2018-10-24 12:37:32,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:32,602 INFO L481 AbstractCegarLoop]: Abstraction has 640 states and 725 transitions. [2018-10-24 12:37:32,602 INFO L482 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-10-24 12:37:32,602 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 725 transitions. [2018-10-24 12:37:32,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2018-10-24 12:37:32,605 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:32,605 INFO L375 BasicCegarLoop]: trace histogram [85, 85, 84, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:32,605 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:32,606 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:32,606 INFO L82 PathProgramCache]: Analyzing trace with hash -709031891, now seen corresponding path program 29 times [2018-10-24 12:37:32,606 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:32,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:32,607 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:32,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:32,607 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:32,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:36,350 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 10908 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:36,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:36,350 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:36,350 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:36,350 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:36,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:36,350 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:36,358 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:36,358 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:36,407 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:37:36,407 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:36,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:37,547 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10710 trivial. 0 not checked. [2018-10-24 12:37:37,547 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:38,636 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10710 trivial. 0 not checked. [2018-10-24 12:37:38,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:38,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 16, 16] total 126 [2018-10-24 12:37:38,657 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:38,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 112 states [2018-10-24 12:37:38,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2018-10-24 12:37:38,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7391, Invalid=8359, Unknown=0, NotChecked=0, Total=15750 [2018-10-24 12:37:38,660 INFO L87 Difference]: Start difference. First operand 640 states and 725 transitions. Second operand 112 states. [2018-10-24 12:37:43,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:43,950 INFO L93 Difference]: Finished difference Result 1201 states and 1322 transitions. [2018-10-24 12:37:43,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2018-10-24 12:37:43,951 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 303 [2018-10-24 12:37:43,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:43,956 INFO L225 Difference]: With dead ends: 1201 [2018-10-24 12:37:43,956 INFO L226 Difference]: Without dead ends: 1171 [2018-10-24 12:37:43,958 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 580 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=7397, Invalid=8605, Unknown=0, NotChecked=0, Total=16002 [2018-10-24 12:37:43,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1171 states. [2018-10-24 12:37:43,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1171 to 727. [2018-10-24 12:37:43,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 727 states. [2018-10-24 12:37:43,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 727 states to 727 states and 824 transitions. [2018-10-24 12:37:43,969 INFO L78 Accepts]: Start accepts. Automaton has 727 states and 824 transitions. Word has length 303 [2018-10-24 12:37:43,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:43,969 INFO L481 AbstractCegarLoop]: Abstraction has 727 states and 824 transitions. [2018-10-24 12:37:43,969 INFO L482 AbstractCegarLoop]: Interpolant automaton has 112 states. [2018-10-24 12:37:43,969 INFO L276 IsEmpty]: Start isEmpty. Operand 727 states and 824 transitions. [2018-10-24 12:37:43,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2018-10-24 12:37:43,972 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:43,972 INFO L375 BasicCegarLoop]: trace histogram [97, 97, 96, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:43,972 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:43,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:43,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1992803276, now seen corresponding path program 30 times [2018-10-24 12:37:43,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:43,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:43,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:43,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:43,974 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:44,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:49,052 INFO L134 CoverageAnalysis]: Checked inductivity of 14202 backedges. 0 proven. 14202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:49,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:49,052 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:49,052 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:49,053 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:49,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:49,053 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:49,061 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:49,061 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:49,181 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:49,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:49,188 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:49,514 INFO L134 CoverageAnalysis]: Checked inductivity of 14202 backedges. 0 proven. 14202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:49,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:01,985 INFO L134 CoverageAnalysis]: Checked inductivity of 14202 backedges. 0 proven. 14202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:02,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 206 [2018-10-24 12:38:02,006 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:02,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-10-24 12:38:02,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-10-24 12:38:02,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20311, Invalid=21919, Unknown=0, NotChecked=0, Total=42230 [2018-10-24 12:38:02,010 INFO L87 Difference]: Start difference. First operand 727 states and 824 transitions. Second operand 113 states. [2018-10-24 12:38:09,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:09,970 INFO L93 Difference]: Finished difference Result 893 states and 1003 transitions. [2018-10-24 12:38:09,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2018-10-24 12:38:09,970 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 342 [2018-10-24 12:38:09,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:09,973 INFO L225 Difference]: With dead ends: 893 [2018-10-24 12:38:09,973 INFO L226 Difference]: Without dead ends: 887 [2018-10-24 12:38:09,974 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 573 SyntacticMatches, 19 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2604 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=20317, Invalid=22325, Unknown=0, NotChecked=0, Total=42642 [2018-10-24 12:38:09,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2018-10-24 12:38:09,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 734. [2018-10-24 12:38:09,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 734 states. [2018-10-24 12:38:09,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 734 states to 734 states and 832 transitions. [2018-10-24 12:38:09,988 INFO L78 Accepts]: Start accepts. Automaton has 734 states and 832 transitions. Word has length 342 [2018-10-24 12:38:09,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:09,988 INFO L481 AbstractCegarLoop]: Abstraction has 734 states and 832 transitions. [2018-10-24 12:38:09,988 INFO L482 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-10-24 12:38:09,989 INFO L276 IsEmpty]: Start isEmpty. Operand 734 states and 832 transitions. [2018-10-24 12:38:09,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2018-10-24 12:38:09,992 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:09,992 INFO L375 BasicCegarLoop]: trace histogram [98, 98, 97, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:09,992 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:09,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:09,993 INFO L82 PathProgramCache]: Analyzing trace with hash -294769805, now seen corresponding path program 31 times [2018-10-24 12:38:09,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:09,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:09,993 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:09,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:09,994 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:10,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:15,066 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:15,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,067 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:15,067 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:15,067 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:15,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,067 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:15,074 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:15,074 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:15,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:15,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:15,371 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:15,371 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:27,706 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:27,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:27,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 114, 114] total 206 [2018-10-24 12:38:27,728 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:27,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-10-24 12:38:27,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-10-24 12:38:27,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20311, Invalid=21919, Unknown=0, NotChecked=0, Total=42230 [2018-10-24 12:38:27,731 INFO L87 Difference]: Start difference. First operand 734 states and 832 transitions. Second operand 114 states. [2018-10-24 12:38:34,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:34,741 INFO L93 Difference]: Finished difference Result 867 states and 978 transitions. [2018-10-24 12:38:34,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2018-10-24 12:38:34,742 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 345 [2018-10-24 12:38:34,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:34,747 INFO L225 Difference]: With dead ends: 867 [2018-10-24 12:38:34,747 INFO L226 Difference]: Without dead ends: 861 [2018-10-24 12:38:34,749 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 804 GetRequests, 578 SyntacticMatches, 21 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2805 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=20317, Invalid=22325, Unknown=0, NotChecked=0, Total=42642 [2018-10-24 12:38:34,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2018-10-24 12:38:34,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 741. [2018-10-24 12:38:34,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 741 states. [2018-10-24 12:38:34,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 741 states to 741 states and 840 transitions. [2018-10-24 12:38:34,759 INFO L78 Accepts]: Start accepts. Automaton has 741 states and 840 transitions. Word has length 345 [2018-10-24 12:38:34,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:34,760 INFO L481 AbstractCegarLoop]: Abstraction has 741 states and 840 transitions. [2018-10-24 12:38:34,760 INFO L482 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-10-24 12:38:34,760 INFO L276 IsEmpty]: Start isEmpty. Operand 741 states and 840 transitions. [2018-10-24 12:38:34,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2018-10-24 12:38:34,763 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:34,763 INFO L375 BasicCegarLoop]: trace histogram [99, 99, 98, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:34,763 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:34,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:34,763 INFO L82 PathProgramCache]: Analyzing trace with hash -304447532, now seen corresponding path program 32 times [2018-10-24 12:38:34,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:34,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,764 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:34,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,765 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:34,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:40,018 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 14787 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:40,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:40,019 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:40,019 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:40,019 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:40,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:40,019 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:40,026 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:40,026 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:40,190 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-24 12:38:40,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:40,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:40,939 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 14553 trivial. 0 not checked. [2018-10-24 12:38:40,939 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:42,288 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 14553 trivial. 0 not checked. [2018-10-24 12:38:42,308 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:42,308 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 17, 17] total 131 [2018-10-24 12:38:42,308 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:42,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-10-24 12:38:42,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-10-24 12:38:42,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8011, Invalid=9019, Unknown=0, NotChecked=0, Total=17030 [2018-10-24 12:38:42,310 INFO L87 Difference]: Start difference. First operand 741 states and 840 transitions. Second operand 116 states. [2018-10-24 12:38:49,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:49,854 INFO L93 Difference]: Finished difference Result 847 states and 961 transitions. [2018-10-24 12:38:49,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2018-10-24 12:38:49,854 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 348 [2018-10-24 12:38:49,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:49,859 INFO L225 Difference]: With dead ends: 847 [2018-10-24 12:38:49,860 INFO L226 Difference]: Without dead ends: 839 [2018-10-24 12:38:49,861 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 679 SyntacticMatches, 2 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=8017, Invalid=9275, Unknown=0, NotChecked=0, Total=17292 [2018-10-24 12:38:49,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 839 states. [2018-10-24 12:38:49,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 839 to 751. [2018-10-24 12:38:49,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 751 states. [2018-10-24 12:38:49,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 751 states to 751 states and 851 transitions. [2018-10-24 12:38:49,871 INFO L78 Accepts]: Start accepts. Automaton has 751 states and 851 transitions. Word has length 348 [2018-10-24 12:38:49,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:49,871 INFO L481 AbstractCegarLoop]: Abstraction has 751 states and 851 transitions. [2018-10-24 12:38:49,872 INFO L482 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-10-24 12:38:49,872 INFO L276 IsEmpty]: Start isEmpty. Operand 751 states and 851 transitions. [2018-10-24 12:38:49,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2018-10-24 12:38:49,874 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:49,875 INFO L375 BasicCegarLoop]: trace histogram [100, 100, 99, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:49,875 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:49,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:49,875 INFO L82 PathProgramCache]: Analyzing trace with hash -127276786, now seen corresponding path program 33 times [2018-10-24 12:38:49,875 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:49,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:49,876 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:49,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:49,876 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:49,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-24 12:38:51,446 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:38:51,450 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:38:51,451 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:38:51 BoogieIcfgContainer [2018-10-24 12:38:51,451 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:38:51,451 INFO L168 Benchmark]: Toolchain (without parser) took 244862.30 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 868.2 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -114.5 MB). Peak memory consumption was 753.7 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:51,453 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:38:51,453 INFO L168 Benchmark]: CACSL2BoogieTranslator took 303.36 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:51,454 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.52 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:38:51,454 INFO L168 Benchmark]: Boogie Preprocessor took 34.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:38:51,454 INFO L168 Benchmark]: RCFGBuilder took 427.62 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 740.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -792.7 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:51,455 INFO L168 Benchmark]: TraceAbstraction took 244062.40 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 127.4 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 667.7 MB). Peak memory consumption was 795.1 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:51,459 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 303.36 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.52 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 34.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 427.62 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 740.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -792.7 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 244062.40 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 127.4 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 667.7 MB). Peak memory consumption was 795.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 355 with TraceHistMax 100,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 42 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. TIMEOUT Result, 243.9s OverallTime, 37 OverallIterations, 100 TraceHistogramMax, 70.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 519 SDtfs, 13419 SDslu, 15498 SDs, 0 SdLazy, 10671 SolverSat, 4333 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 21.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 12672 GetRequests, 9564 SyntacticMatches, 72 SemanticMatches, 3036 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15512 ImplicationChecksByTransitivity, 162.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=751occurred in iteration=36, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 36 MinimizatonAttempts, 4989 StatesRemovedByMinimization, 34 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.4s SsaConstructionTime, 2.5s SatisfiabilityAnalysisTime, 165.9s InterpolantComputationTime, 10931 NumberOfCodeBlocks, 9743 NumberOfCodeBlocksAsserted, 156 NumberOfCheckSat, 16268 ConstructedInterpolants, 0 QuantifiedInterpolants, 9423888 SizeOfPredicates, 78 NumberOfNonLiveVariables, 10115 ConjunctsInSsa, 1373 ConjunctsInUnsatCore, 102 InterpolantComputations, 3 PerfectInterpolantSequences, 92865/414984 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown